[PATCH 0/4] usb: gadget: fix most of W=1 warinngs

[PATCH 0/4] usb: gadget: fix most of W=1 warinngs

[Michal Nazarewicz]

Fixes all of the unused-but-set-variable warnings enabled when
building with W=1.  As described in the first patch, some warnings are
left off.  See said patch for more description.

Michal Nazarewicz (4):
  usb: gadget: fix unused-but-set-variale warnings
  usb: gadget: m66592: fix unused-but-set-variable warnings
  usb: gadget: r8a66597: fix unused-but-set-variable warnings
  usb: gadget: mv_u3d: fix unused-but-set-variable warnings

 drivers/usb/gadget/function/f_fs.c     |  3 +-
 drivers/usb/gadget/function/u_serial.c |  3 +-
 drivers/usb/gadget/legacy/g_ffs.c      | 15 ++++------
 drivers/usb/gadget/udc/amd5536udc.c    |  9 +-----
 drivers/usb/gadget/udc/bdc/bdc_cmd.c   |  3 --
 drivers/usb/gadget/udc/bdc/bdc_ep.c    |  4 ---
 drivers/usb/gadget/udc/dummy_hcd.c     |  5 ----
 drivers/usb/gadget/udc/m66592-udc.c    | 24 ++++-----------
 drivers/usb/gadget/udc/mv_u3d_core.c   | 23 ++-------------
 drivers/usb/gadget/udc/mv_udc_core.c   |  9 ++----
 drivers/usb/gadget/udc/net2272.c       |  4 ---
 drivers/usb/gadget/udc/pch_udc.c       | 54 +++++++++++++++-------------------
 drivers/usb/gadget/udc/pxa27x_udc.c    |  3 --
 drivers/usb/gadget/udc/r8a66597-udc.c  | 24 ++++-----------
 drivers/usb/gadget/udc/udc-xilinx.c    |  3 --
 15 files changed, 50 insertions(+), 136 deletions(-)

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

[PATCH 1/4] usb: gadget: fix unused-but-set-variale warnings

[Michal Nazarewicz]

Those are enabled with W=1 make option.

type-limits warnings in uvc_configfs.o and f_hid.c are left because
they are caused by generic macros used in a way where they produce
always-false conditions, e.g.:

  CC [M]  drivers/usb/gadget/function/uvc_configfs.o
drivers/usb/gadget/function/uvc_configfs.c: In function ‘uvcg_control_header_bcd_uvc_store’:
drivers/usb/gadget/function/uvc_configfs.c:83:9: warning: comparison is always false due to limited range of data type [-Wtype-limits]
  struct mutex *su_mutex = &ch->item.ci_group->cg_subsys->su_mutex;\
         ^
drivers/usb/gadget/function/uvc_configfs.c:116:1: note: in expansion of macro ‘UVCG_CTRL_HDR_ATTR’
 UVCG_CTRL_HDR_ATTR(bcd_uvc, bcdUVC, le16_to_cpu, kstrtou16, u16, cpu_to_le16,
 ^

  CC [M]  drivers/usb/gadget/function/f_hid.o
drivers/usb/gadget/function/f_hid.c: In function ‘f_hid_opts_subclass_store’:
drivers/usb/gadget/function/f_hid.c:735:9: warning: comparison is always false due to limited range of data type [-Wtype-limits]
  struct f_hid_opts *opts = to_f_hid_opts(item);   \
         ^
drivers/usb/gadget/function/f_hid.c:763:1: note: in expansion of macro ‘F_HID_OPT’
 F_HID_OPT(subclass, 8, 255);
 ^

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 drivers/usb/gadget/function/f_fs.c     |  3 +-
 drivers/usb/gadget/function/u_serial.c |  3 +-
 drivers/usb/gadget/legacy/g_ffs.c      | 15 ++++------
 drivers/usb/gadget/udc/amd5536udc.c    |  9 +-----
 drivers/usb/gadget/udc/bdc/bdc_cmd.c   |  3 --
 drivers/usb/gadget/udc/bdc/bdc_ep.c    |  4 ---
 drivers/usb/gadget/udc/dummy_hcd.c     |  5 ----
 drivers/usb/gadget/udc/mv_udc_core.c   |  9 ++----
 drivers/usb/gadget/udc/net2272.c       |  4 ---
 drivers/usb/gadget/udc/pch_udc.c       | 54 +++++++++++++++-------------------
 drivers/usb/gadget/udc/pxa27x_udc.c    |  3 --
 drivers/usb/gadget/udc/udc-xilinx.c    |  3 --
 12 files changed, 35 insertions(+), 80 deletions(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index e21ca2bd..f931da7 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2228,8 +2228,8 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
 {
 	u32 str_count, needed_count, lang_count;
 	struct usb_gadget_strings **stringtabs, *t;
-	struct usb_string *strings, *s;
 	const char *data = _data;
+	struct usb_string *s;
 
 	ENTER();
 
@@ -2287,7 +2287,6 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
 		stringtabs = vla_ptr(vlabuf, d, stringtabs);
 		t = vla_ptr(vlabuf, d, stringtab);
 		s = vla_ptr(vlabuf, d, strings);
-		strings = s;
 	}
 
 	/* For each language */
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 6af145f..60489c2 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -907,7 +907,6 @@ static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
 	struct gs_port	*port = tty->driver_data;
 	unsigned long	flags;
-	int		status;
 
 	pr_vdebug("gs_write: ttyGS%d (%p) writing %d bytes\n",
 			port->port_num, tty, count);
@@ -917,7 +916,7 @@ static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 		count = gs_buf_put(&port->port_write_buf, buf, count);
 	/* treat count == 0 as flush_chars() */
 	if (port->port_usb)
-		status = gs_start_tx(port);
+		gs_start_tx(port);
 	spin_unlock_irqrestore(&port->port_lock, flags);
 
 	return count;
diff --git a/drivers/usb/gadget/legacy/g_ffs.c b/drivers/usb/gadget/legacy/g_ffs.c
index f85639e..6da7316 100644
--- a/drivers/usb/gadget/legacy/g_ffs.c
+++ b/drivers/usb/gadget/legacy/g_ffs.c
@@ -265,7 +265,7 @@ static void *functionfs_acquire_dev(struct ffs_dev *dev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return ERR_PTR(-ENOENT);
-	
+
 	return NULL;
 }
 
@@ -275,7 +275,7 @@ static void functionfs_release_dev(struct ffs_dev *dev)
 }
 
 /*
- * The caller of this function takes ffs_lock 
+ * The caller of this function takes ffs_lock
  */
 static int functionfs_ready_callback(struct ffs_data *ffs)
 {
@@ -294,12 +294,12 @@ static int functionfs_ready_callback(struct ffs_data *ffs)
 		++missing_funcs;
 		gfs_registered = false;
 	}
-	
+
 	return ret;
 }
 
 /*
- * The caller of this function takes ffs_lock 
+ * The caller of this function takes ffs_lock
  */
 static void functionfs_closed_callback(struct ffs_data *ffs)
 {
@@ -347,17 +347,14 @@ static int gfs_bind(struct usb_composite_dev *cdev)
 
 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
 	{
-		struct f_rndis_opts *rndis_opts;
-
 		fi_rndis = usb_get_function_instance("rndis");
 		if (IS_ERR(fi_rndis)) {
 			ret = PTR_ERR(fi_rndis);
 			goto error;
 		}
-		rndis_opts = container_of(fi_rndis, struct f_rndis_opts,
-					  func_inst);
 #ifndef CONFIG_USB_FUNCTIONFS_ETH
-		net = rndis_opts->net;
+		net = container_of(fi_rndis, struct f_rndis_opts,
+				   func_inst)->net;
 #endif
 	}
 #endif
diff --git a/drivers/usb/gadget/udc/amd5536udc.c b/drivers/usb/gadget/udc/amd5536udc.c
index 39d70b4..ea03ca7 100644
--- a/drivers/usb/gadget/udc/amd5536udc.c
+++ b/drivers/usb/gadget/udc/amd5536udc.c
@@ -2340,7 +2340,6 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
 	struct udc_ep *ep;
 	struct udc_request *req;
 	struct udc_data_dma *td;
-	unsigned dma_done;
 	unsigned len;
 
 	ep = &dev->ep[ep_ix];
@@ -2385,13 +2384,8 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
 			 */
 			if (use_dma_ppb_du) {
 				td = udc_get_last_dma_desc(req);
-				if (td) {
-					dma_done =
-						AMD_GETBITS(td->status,
-						UDC_DMA_IN_STS_BS);
-					/* don't care DMA done */
+				if (td)
 					req->req.actual = req->req.length;
-				}
 			} else {
 				/* assume all bytes transferred */
 				req->req.actual = req->req.length;
@@ -3417,4 +3411,3 @@ module_pci_driver(udc_pci_driver);
 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 MODULE_AUTHOR("Thomas Dahlmann");
 MODULE_LICENSE("GPL");
-
diff --git a/drivers/usb/gadget/udc/bdc/bdc_cmd.c b/drivers/usb/gadget/udc/bdc/bdc_cmd.c
index 6a4155c..4d5e918 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_cmd.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_cmd.c
@@ -57,7 +57,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 					u32 param0, u32 param1,	u32 param2)
 {
 	u32 temp, cmd_status;
-	int reset_bdc = 0;
 	int ret;
 
 	temp = bdc_readl(bdc->regs, BDC_CMDSC);
@@ -94,7 +93,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 
 	case BDC_CMDS_INTL:
 		dev_err(bdc->dev, "BDC Internal error\n");
-		reset_bdc = 1;
 		ret = -ECONNRESET;
 		break;
 
@@ -102,7 +100,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 		dev_err(bdc->dev,
 			"command timedout waited for %dusec\n",
 			BDC_CMD_TIMEOUT);
-		reset_bdc = 1;
 		ret = -ECONNRESET;
 		break;
 	default:
diff --git a/drivers/usb/gadget/udc/bdc/bdc_ep.c b/drivers/usb/gadget/udc/bdc/bdc_ep.c
index d619950..650717e 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_ep.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_ep.c
@@ -702,11 +702,9 @@ static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
 /* Queue data stage */
 static int ep0_queue_data_stage(struct bdc *bdc)
 {
-	struct usb_request *ep0_usb_req;
 	struct bdc_ep *ep;
 
 	dev_dbg(bdc->dev, "%s\n", __func__);
-	ep0_usb_req = &bdc->ep0_req.usb_req;
 	ep = bdc->bdc_ep_array[1];
 	bdc->ep0_req.ep = ep;
 	bdc->ep0_req.usb_req.complete = NULL;
@@ -1393,10 +1391,8 @@ static int ep0_set_sel(struct bdc *bdc,
 {
 	struct bdc_ep	*ep;
 	u16	wLength;
-	u16	wValue;
 
 	dev_dbg(bdc->dev, "%s\n", __func__);
-	wValue = le16_to_cpu(setup_pkt->wValue);
 	wLength = le16_to_cpu(setup_pkt->wLength);
 	if (unlikely(wLength != 6)) {
 		dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index dde4445..77d0790 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -647,12 +647,10 @@ static int dummy_disable(struct usb_ep *_ep)
 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
 		gfp_t mem_flags)
 {
-	struct dummy_ep		*ep;
 	struct dummy_request	*req;
 
 	if (!_ep)
 		return NULL;
-	ep = usb_ep_to_dummy_ep(_ep);
 
 	req = kzalloc(sizeof(*req), mem_flags);
 	if (!req)
@@ -2444,9 +2442,6 @@ static int dummy_start(struct usb_hcd *hcd)
 
 static void dummy_stop(struct usb_hcd *hcd)
 {
-	struct dummy		*dum;
-
-	dum = hcd_to_dummy_hcd(hcd)->dum;
 	device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
 	dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
 }
diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index 81b6229..ce73b35 100644
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -129,7 +129,7 @@ static int process_ep_req(struct mv_udc *udc, int index,
 {
 	struct mv_dtd	*curr_dtd;
 	struct mv_dqh	*curr_dqh;
-	int td_complete, actual, remaining_length;
+	int actual, remaining_length;
 	int i, direction;
 	int retval = 0;
 	u32 errors;
@@ -139,7 +139,6 @@ static int process_ep_req(struct mv_udc *udc, int index,
 	direction = index % 2;
 
 	curr_dtd = curr_req->head;
-	td_complete = 0;
 	actual = curr_req->req.length;
 
 	for (i = 0; i < curr_req->dtd_count; i++) {
@@ -412,11 +411,8 @@ static int req_to_dtd(struct mv_req *req)
 	unsigned count;
 	int is_last, is_first = 1;
 	struct mv_dtd *dtd, *last_dtd = NULL;
-	struct mv_udc *udc;
 	dma_addr_t dma;
 
-	udc = req->ep->udc;
-
 	do {
 		dtd = build_dtd(req, &count, &dma, &is_last);
 		if (dtd == NULL)
@@ -567,7 +563,7 @@ static int  mv_ep_disable(struct usb_ep *_ep)
 	struct mv_udc *udc;
 	struct mv_ep *ep;
 	struct mv_dqh *dqh;
-	u32 bit_pos, epctrlx, direction;
+	u32 epctrlx, direction;
 	unsigned long flags;
 
 	ep = container_of(_ep, struct mv_ep, ep);
@@ -582,7 +578,6 @@ static int  mv_ep_disable(struct usb_ep *_ep)
 	spin_lock_irqsave(&udc->lock, flags);
 
 	direction = ep_dir(ep);
-	bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num);
 
 	/* Reset the max packet length and the interrupt on Setup */
 	dqh->max_packet_length = 0;
diff --git a/drivers/usb/gadget/udc/net2272.c b/drivers/usb/gadget/udc/net2272.c
index 18f5ebd..7c61134 100644
--- a/drivers/usb/gadget/udc/net2272.c
+++ b/drivers/usb/gadget/udc/net2272.c
@@ -329,12 +329,10 @@ static int net2272_disable(struct usb_ep *_ep)
 static struct usb_request *
 net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 {
-	struct net2272_ep *ep;
 	struct net2272_request *req;
 
 	if (!_ep)
 		return NULL;
-	ep = container_of(_ep, struct net2272_ep, ep);
 
 	req = kzalloc(sizeof(*req), gfp_flags);
 	if (!req)
@@ -348,10 +346,8 @@ net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 static void
 net2272_free_request(struct usb_ep *_ep, struct usb_request *_req)
 {
-	struct net2272_ep *ep;
 	struct net2272_request *req;
 
-	ep = container_of(_ep, struct net2272_ep, ep);
 	if (!_ep || !_req)
 		return;
 
diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
index 9571ef5..64994d4 100644
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1743,14 +1743,14 @@ static int pch_udc_pcd_ep_disable(struct usb_ep *usbep)
 	if ((usbep->name == ep0_string) || !ep->ep.desc)
 		return -EINVAL;
 
-	spin_lock_irqsave(&ep->dev->lock, iflags);
+	spin_lock_irqsave(&dev->lock, iflags);
 	empty_req_queue(ep);
 	ep->halted = 1;
 	pch_udc_ep_disable(ep);
-	pch_udc_disable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
+	pch_udc_disable_ep_interrupts(dev, PCH_UDC_EPINT(ep->in, ep->num));
 	ep->ep.desc = NULL;
 	INIT_LIST_HEAD(&ep->queue);
-	spin_unlock_irqrestore(&ep->dev->lock, iflags);
+	spin_unlock_irqrestore(&dev->lock, iflags);
 	return 0;
 }
 
@@ -1782,10 +1782,10 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
 	req->req.dma = DMA_ADDR_INVALID;
 	req->dma = DMA_ADDR_INVALID;
 	INIT_LIST_HEAD(&req->queue);
-	if (!ep->dev->dma_addr)
+	if (!dev->dma_addr)
 		return &req->req;
 	/* ep0 in requests are allocated from data pool here */
-	dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
+	dma_desc = pci_pool_alloc(dev->data_requests, gfp,
 				  &req->td_data_phys);
 	if (NULL == dma_desc) {
 		kfree(req);
@@ -1957,7 +1957,7 @@ static int pch_udc_pcd_dequeue(struct usb_ep *usbep,
 	if (!usbep || !usbreq || (!ep->ep.desc && ep->num))
 		return ret;
 	req = container_of(usbreq, struct pch_udc_request, req);
-	spin_lock_irqsave(&ep->dev->lock, flags);
+	spin_lock_irqsave(&dev->lock, flags);
 	/* make sure it's still queued on this endpoint */
 	list_for_each_entry(req, &ep->queue, queue) {
 		if (&req->req == usbreq) {
@@ -1968,7 +1968,7 @@ static int pch_udc_pcd_dequeue(struct usb_ep *usbep,
 			break;
 		}
 	}
-	spin_unlock_irqrestore(&ep->dev->lock, flags);
+	spin_unlock_irqrestore(&dev->lock, flags);
 	return ret;
 }
 
@@ -1995,17 +1995,16 @@ static int pch_udc_pcd_set_halt(struct usb_ep *usbep, int halt)
 	dev = ep->dev;
 	if (!ep->ep.desc && !ep->num)
 		return -EINVAL;
-	if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
+	if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
 		return -ESHUTDOWN;
 	spin_lock_irqsave(&udc_stall_spinlock, iflags);
 	if (list_empty(&ep->queue)) {
 		if (halt) {
 			if (ep->num == PCH_UDC_EP0)
-				ep->dev->stall = 1;
+				dev->stall = 1;
 			pch_udc_ep_set_stall(ep);
-			pch_udc_enable_ep_interrupts(ep->dev,
-						     PCH_UDC_EPINT(ep->in,
-								   ep->num));
+			pch_udc_enable_ep_interrupts(
+				dev, PCH_UDC_EPINT(ep->in, ep->num));
 		} else {
 			pch_udc_ep_clear_stall(ep);
 		}
@@ -2040,18 +2039,18 @@ static int pch_udc_pcd_set_wedge(struct usb_ep *usbep)
 	dev = ep->dev;
 	if (!ep->ep.desc && !ep->num)
 		return -EINVAL;
-	if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
+	if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
 		return -ESHUTDOWN;
 	spin_lock_irqsave(&udc_stall_spinlock, iflags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
 	} else {
 		if (ep->num == PCH_UDC_EP0)
-			ep->dev->stall = 1;
+			dev->stall = 1;
 		pch_udc_ep_set_stall(ep);
-		pch_udc_enable_ep_interrupts(ep->dev,
+		pch_udc_enable_ep_interrupts(dev,
 					     PCH_UDC_EPINT(ep->in, ep->num));
-		ep->dev->prot_stall = 1;
+		dev->prot_stall = 1;
 		ret = 0;
 	}
 	spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
@@ -2472,16 +2471,11 @@ static void pch_udc_svc_control_out(struct pch_udc_dev *dev)
  */
 static void pch_udc_postsvc_epinters(struct pch_udc_dev *dev, int ep_num)
 {
-	struct pch_udc_ep	*ep;
-	struct pch_udc_request *req;
-
-	ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
-	if (!list_empty(&ep->queue)) {
-		req = list_entry(ep->queue.next, struct pch_udc_request, queue);
-		pch_udc_enable_ep_interrupts(ep->dev,
-					     PCH_UDC_EPINT(ep->in, ep->num));
-		pch_udc_ep_clear_nak(ep);
-	}
+	struct pch_udc_ep *ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
+	if (list_empty(&ep->queue))
+		return;
+	pch_udc_enable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
+	pch_udc_ep_clear_nak(ep);
 }
 
 /**
@@ -2647,7 +2641,7 @@ static void pch_udc_svc_enum_interrupt(struct pch_udc_dev *dev)
 static void pch_udc_svc_intf_interrupt(struct pch_udc_dev *dev)
 {
 	u32 reg, dev_stat = 0;
-	int i, ret;
+	int i;
 
 	dev_stat = pch_udc_read_device_status(dev);
 	dev->cfg_data.cur_intf = (dev_stat & UDC_DEVSTS_INTF_MASK) >>
@@ -2676,7 +2670,7 @@ static void pch_udc_svc_intf_interrupt(struct pch_udc_dev *dev)
 	}
 	dev->stall = 0;
 	spin_lock(&dev->lock);
-	ret = dev->driver->setup(&dev->gadget, &dev->setup_data);
+	dev->driver->setup(&dev->gadget, &dev->setup_data);
 	spin_unlock(&dev->lock);
 }
 
@@ -2687,7 +2681,7 @@ static void pch_udc_svc_intf_interrupt(struct pch_udc_dev *dev)
  */
 static void pch_udc_svc_cfg_interrupt(struct pch_udc_dev *dev)
 {
-	int i, ret;
+	int i;
 	u32 reg, dev_stat = 0;
 
 	dev_stat = pch_udc_read_device_status(dev);
@@ -2713,7 +2707,7 @@ static void pch_udc_svc_cfg_interrupt(struct pch_udc_dev *dev)
 
 	/* call gadget zero with setup data received */
 	spin_lock(&dev->lock);
-	ret = dev->driver->setup(&dev->gadget, &dev->setup_data);
+	dev->driver->setup(&dev->gadget, &dev->setup_data);
 	spin_unlock(&dev->lock);
 }
 
diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/pxa27x_udc.c
index 001a3b7..72aca2f 100644
--- a/drivers/usb/gadget/udc/pxa27x_udc.c
+++ b/drivers/usb/gadget/udc/pxa27x_udc.c
@@ -1829,9 +1829,6 @@ static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
 {
 	int i;
 
-	/* don't disconnect drivers more than once */
-	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
-		driver = NULL;
 	udc->gadget.speed = USB_SPEED_UNKNOWN;
 
 	for (i = 0; i < NR_USB_ENDPOINTS; i++)
diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index 1cbb0ac..f8bf290 100644
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c
@@ -2055,7 +2055,6 @@ static int xudc_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct resource *res;
 	struct xusb_udc *udc;
-	struct xusb_ep *ep0;
 	int irq;
 	int ret;
 	u32 ier;
@@ -2119,8 +2118,6 @@ static int xudc_probe(struct platform_device *pdev)
 
 	xudc_eps_init(udc);
 
-	ep0 = &udc->ep[0];
-
 	/* Set device address to 0.*/
 	udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
 
-- 
2.8.0.rc3.226.g39d4020

[PATCH 2/4] usb: gadget: m66592: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/m66592-udc.c: In function ‘m66592_irq’:
drivers/usb/gadget/udc/m66592-udc.c:1203:15: warning: variable ‘nrdyenb’ set but not used [-Wunused-but-set-variable]
  u16 brdyenb, nrdyenb, bempenb;
               ^
drivers/usb/gadget/udc/m66592-udc.c:1202:15: warning: variable ‘nrdysts’ set but not used [-Wunused-but-set-variable]
  u16 brdysts, nrdysts, bempsts;
               ^

In doing so, it removes calls to m66592_read function which does I/O
with the device, but I hope the reads don’t have any side effects that
are needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
---
 drivers/usb/gadget/udc/m66592-udc.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/udc/m66592-udc.c b/drivers/usb/gadget/udc/m66592-udc.c
index b1cfa96..6e977dc 100644
--- a/drivers/usb/gadget/udc/m66592-udc.c
+++ b/drivers/usb/gadget/udc/m66592-udc.c
@@ -1199,8 +1199,6 @@ static irqreturn_t m66592_irq(int irq, void *_m66592)
 	struct m66592 *m66592 = _m66592;
 	u16 intsts0;
 	u16 intenb0;
-	u16 brdysts, nrdysts, bempsts;
-	u16 brdyenb, nrdyenb, bempenb;
 	u16 savepipe;
 	u16 mask0;
 
@@ -1224,12 +1222,10 @@ static irqreturn_t m66592_irq(int irq, void *_m66592)
 
 	mask0 = intsts0 & intenb0;
 	if (mask0) {
-		brdysts = m66592_read(m66592, M66592_BRDYSTS);
-		nrdysts = m66592_read(m66592, M66592_NRDYSTS);
-		bempsts = m66592_read(m66592, M66592_BEMPSTS);
-		brdyenb = m66592_read(m66592, M66592_BRDYENB);
-		nrdyenb = m66592_read(m66592, M66592_NRDYENB);
-		bempenb = m66592_read(m66592, M66592_BEMPENB);
+		u16 brdysts = m66592_read(m66592, M66592_BRDYSTS);
+		u16 bempsts = m66592_read(m66592, M66592_BEMPSTS);
+		u16 brdyenb = m66592_read(m66592, M66592_BRDYENB);
+		u16 bempenb = m66592_read(m66592, M66592_BEMPENB);
 
 		if (mask0 & M66592_VBINT) {
 			m66592_write(m66592,  0xffff & ~M66592_VBINT,
@@ -1408,28 +1404,20 @@ static int m66592_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 
 static int m66592_set_halt(struct usb_ep *_ep, int value)
 {
-	struct m66592_ep *ep;
-	struct m66592_request *req;
+	struct m66592_ep *ep = container_of(_ep, struct m66592_ep, ep);
 	unsigned long flags;
 	int ret = 0;
 
-	ep = container_of(_ep, struct m66592_ep, ep);
-	req = list_entry(ep->queue.next, struct m66592_request, queue);
-
 	spin_lock_irqsave(&ep->m66592->lock, flags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
-		goto out;
-	}
-	if (value) {
+	} else if (value) {
 		ep->busy = 1;
 		pipe_stall(ep->m66592, ep->pipenum);
 	} else {
 		ep->busy = 0;
 		pipe_stop(ep->m66592, ep->pipenum);
 	}
-
-out:
 	spin_unlock_irqrestore(&ep->m66592->lock, flags);
 	return ret;
 }
-- 
2.8.0.rc3.226.g39d4020

[PATCH 3/4] usb: gadget: r8a66597: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/r8a66597-udc.c: In function ‘r8a66597_irq’:
drivers/usb/gadget/udc/r8a66597-udc.c:1468:15: warning: variable ‘nrdyenb’ set but not used [-Wunused-but-set-variable]
  u16 brdyenb, nrdyenb, bempenb;
               ^
drivers/usb/gadget/udc/r8a66597-udc.c:1467:15: warning: variable ‘nrdysts’ set but not used [-Wunused-but-set-variable]
  u16 brdysts, nrdysts, bempsts;
               ^

In doing so, it removes calls to r8a66597_read function which does I/O
with the device, but I hope the reads don’t have any side effects that
are needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
---
 drivers/usb/gadget/udc/r8a66597-udc.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index baa0609..d89bbfd 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1464,8 +1464,6 @@ static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
 	struct r8a66597 *r8a66597 = _r8a66597;
 	u16 intsts0;
 	u16 intenb0;
-	u16 brdysts, nrdysts, bempsts;
-	u16 brdyenb, nrdyenb, bempenb;
 	u16 savepipe;
 	u16 mask0;
 
@@ -1481,12 +1479,10 @@ static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
 
 	mask0 = intsts0 & intenb0;
 	if (mask0) {
-		brdysts = r8a66597_read(r8a66597, BRDYSTS);
-		nrdysts = r8a66597_read(r8a66597, NRDYSTS);
-		bempsts = r8a66597_read(r8a66597, BEMPSTS);
-		brdyenb = r8a66597_read(r8a66597, BRDYENB);
-		nrdyenb = r8a66597_read(r8a66597, NRDYENB);
-		bempenb = r8a66597_read(r8a66597, BEMPENB);
+		u16 brdysts = r8a66597_read(r8a66597, BRDYSTS);
+		u16 bempsts = r8a66597_read(r8a66597, BEMPSTS);
+		u16 brdyenb = r8a66597_read(r8a66597, BRDYENB);
+		u16 bempenb = r8a66597_read(r8a66597, BEMPENB);
 
 		if (mask0 & VBINT) {
 			r8a66597_write(r8a66597,  0xffff & ~VBINT,
@@ -1658,20 +1654,14 @@ static int r8a66597_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 
 static int r8a66597_set_halt(struct usb_ep *_ep, int value)
 {
-	struct r8a66597_ep *ep;
-	struct r8a66597_request *req;
+	struct r8a66597_ep *ep = container_of(_ep, struct r8a66597_ep, ep);
 	unsigned long flags;
 	int ret = 0;
 
-	ep = container_of(_ep, struct r8a66597_ep, ep);
-	req = get_request_from_ep(ep);
-
 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
-		goto out;
-	}
-	if (value) {
+	} else if (value) {
 		ep->busy = 1;
 		pipe_stall(ep->r8a66597, ep->pipenum);
 	} else {
@@ -1679,8 +1669,6 @@ static int r8a66597_set_halt(struct usb_ep *_ep, int value)
 		ep->wedge = 0;
 		pipe_stop(ep->r8a66597, ep->pipenum);
 	}
-
-out:
 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
 	return ret;
 }
-- 
2.8.0.rc3.226.g39d4020

[PATCH 4/4] usb: gadget: mv_u3d: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_process_ep_req’:
drivers/usb/gadget/udc/mv_u3d_core.c:124:6: warning: variable ‘trb_complete’ set but not used [-Wunused-but-set-variable]
  int trb_complete, actual, remaining_length = 0;
      ^
drivers/usb/gadget/udc/mv_u3d_core.c:123:28: warning: variable ‘curr_ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *curr_ep_context;
                            ^
drivers/usb/gadget/udc/mv_u3d_core.c:122:13: warning: variable ‘cur_deq_lo’ set but not used [-Wunused-but-set-variable]
  dma_addr_t cur_deq_lo;
             ^
drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_ep_enable’:
drivers/usb/gadget/udc/mv_u3d_core.c:530:28: warning: variable ‘ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *ep_context;
                            ^
drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_ep_disable’:
drivers/usb/gadget/udc/mv_u3d_core.c:636:28: warning: variable ‘ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *ep_context;
                            ^
In doing so, it removes calls to ioread32 function which does I/O with
the device, but I hope the reads don’t have any side effects that are
needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Yu Xu <yuxu@marvell.com>
---
 drivers/usb/gadget/udc/mv_u3d_core.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c
index dafe74e..b9e19a5 100644
--- a/drivers/usb/gadget/udc/mv_u3d_core.c
+++ b/drivers/usb/gadget/udc/mv_u3d_core.c
@@ -119,18 +119,14 @@ static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index,
 	struct mv_u3d_req *curr_req)
 {
 	struct mv_u3d_trb	*curr_trb;
-	dma_addr_t cur_deq_lo;
-	struct mv_u3d_ep_context	*curr_ep_context;
-	int trb_complete, actual, remaining_length = 0;
+	int actual, remaining_length = 0;
 	int direction, ep_num;
 	int retval = 0;
 	u32 tmp, status, length;
 
-	curr_ep_context = &u3d->ep_context[index];
 	direction = index % 2;
 	ep_num = index / 2;
 
-	trb_complete = 0;
 	actual = curr_req->req.length;
 
 	while (!list_empty(&curr_req->trb_list)) {
@@ -143,15 +139,10 @@ static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index,
 		}
 
 		curr_trb->trb_hw->ctrl.own = 0;
-		if (direction == MV_U3D_EP_DIR_OUT) {
+		if (direction == MV_U3D_EP_DIR_OUT)
 			tmp = ioread32(&u3d->vuc_regs->rxst[ep_num].statuslo);
-			cur_deq_lo =
-				ioread32(&u3d->vuc_regs->rxst[ep_num].curdeqlo);
-		} else {
+		else
 			tmp = ioread32(&u3d->vuc_regs->txst[ep_num].statuslo);
-			cur_deq_lo =
-				ioread32(&u3d->vuc_regs->txst[ep_num].curdeqlo);
-		}
 
 		status = tmp >> MV_U3D_XFERSTATUS_COMPLETE_SHIFT;
 		length = tmp & MV_U3D_XFERSTATUS_TRB_LENGTH_MASK;
@@ -527,7 +518,6 @@ static int mv_u3d_ep_enable(struct usb_ep *_ep,
 {
 	struct mv_u3d *u3d;
 	struct mv_u3d_ep *ep;
-	struct mv_u3d_ep_context *ep_context;
 	u16 max = 0;
 	unsigned maxburst = 0;
 	u32 epxcr, direction;
@@ -548,9 +538,6 @@ static int mv_u3d_ep_enable(struct usb_ep *_ep,
 		_ep->maxburst = 1;
 	maxburst = _ep->maxburst;
 
-	/* Get the endpoint context address */
-	ep_context = (struct mv_u3d_ep_context *)ep->ep_context;
-
 	/* Set the max burst size */
 	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 	case USB_ENDPOINT_XFER_BULK:
@@ -633,7 +620,6 @@ static int  mv_u3d_ep_disable(struct usb_ep *_ep)
 {
 	struct mv_u3d *u3d;
 	struct mv_u3d_ep *ep;
-	struct mv_u3d_ep_context *ep_context;
 	u32 epxcr, direction;
 	unsigned long flags;
 
@@ -646,9 +632,6 @@ static int  mv_u3d_ep_disable(struct usb_ep *_ep)
 
 	u3d = ep->u3d;
 
-	/* Get the endpoint context address */
-	ep_context = ep->ep_context;
-
 	direction = mv_u3d_ep_dir(ep);
 
 	/* nuke all pending requests (does flush) */
-- 
2.8.0.rc3.226.g39d4020

Re: [PATCH 0/4] usb: gadget: fix most of W=1 warinngs

[Felipe Balbi]

[-- Attachment #1: Type: text/plain, Size: 619 bytes --]


Hi,

Michal Nazarewicz <mina86@mina86.com> writes:
> Fixes all of the unused-but-set-variable warnings enabled when
> building with W=1.  As described in the first patch, some warnings are
> left off.  See said patch for more description.
>
> Michal Nazarewicz (4):
>   usb: gadget: fix unused-but-set-variale warnings
>   usb: gadget: m66592: fix unused-but-set-variable warnings
>   usb: gadget: r8a66597: fix unused-but-set-variable warnings
>   usb: gadget: mv_u3d: fix unused-but-set-variable warnings

This series doesn't seem to apply to v4.7-rc1. Care to rebase on
testing/fixes?

-- 
balbi

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 818 bytes --]

Re: [PATCH 0/4] usb: gadget: fix most of W=1 warinngs

[Michal Nazarewicz]

On Tue, May 31 2016, Felipe Balbi wrote:
> This series doesn't seem to apply to v4.7-rc1. Care to rebase on
> testing/fixes?

Sure.  Only the first patch needs fixing (by skipping failed hunks).

Michal Nazarewicz (4):
  usb: gadget: fix unused-but-set-variale warnings
  usb: gadget: m66592: fix unused-but-set-variable warnings
  usb: gadget: r8a66597: fix unused-but-set-variable warnings
  usb: gadget: mv_u3d: fix unused-but-set-variable warnings

 drivers/usb/gadget/function/f_fs.c     |  3 +--
 drivers/usb/gadget/function/u_serial.c |  3 +--
 drivers/usb/gadget/legacy/g_ffs.c      | 15 +++++------
 drivers/usb/gadget/udc/amd5536udc.c    |  9 +------
 drivers/usb/gadget/udc/bdc/bdc_cmd.c   |  3 ---
 drivers/usb/gadget/udc/bdc/bdc_ep.c    |  4 ---
 drivers/usb/gadget/udc/dummy_hcd.c     |  5 ----
 drivers/usb/gadget/udc/m66592-udc.c    | 24 +++++-------------
 drivers/usb/gadget/udc/mv_u3d_core.c   | 23 +++--------------
 drivers/usb/gadget/udc/mv_udc_core.c   |  9 ++-----
 drivers/usb/gadget/udc/net2272.c       |  4 ---
 drivers/usb/gadget/udc/pch_udc.c       | 46 +++++++++++++++-------------------
 drivers/usb/gadget/udc/pxa27x_udc.c    |  3 ---
 drivers/usb/gadget/udc/r8a66597-udc.c  | 24 +++++-------------
 drivers/usb/gadget/udc/udc-xilinx.c    |  3 ---
 15 files changed, 46 insertions(+), 132 deletions(-)

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

[PATCHv2 1/4] usb: gadget: fix unused-but-set-variale warnings

[Michal Nazarewicz]

Those are enabled with W=1 make option.

The patch leaves of some type-limits warnings which are caused by
generic macros used in a way where they produce always-false
conditions.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 drivers/usb/gadget/function/f_fs.c     |  3 +--
 drivers/usb/gadget/function/u_serial.c |  3 +--
 drivers/usb/gadget/legacy/g_ffs.c      | 15 +++++------
 drivers/usb/gadget/udc/amd5536udc.c    |  9 +------
 drivers/usb/gadget/udc/bdc/bdc_cmd.c   |  3 ---
 drivers/usb/gadget/udc/bdc/bdc_ep.c    |  4 ---
 drivers/usb/gadget/udc/dummy_hcd.c     |  5 ----
 drivers/usb/gadget/udc/mv_udc_core.c   |  9 ++-----
 drivers/usb/gadget/udc/net2272.c       |  4 ---
 drivers/usb/gadget/udc/pch_udc.c       | 46 +++++++++++++++-------------------
 drivers/usb/gadget/udc/pxa27x_udc.c    |  3 ---
 drivers/usb/gadget/udc/udc-xilinx.c    |  3 ---
 12 files changed, 31 insertions(+), 76 deletions(-)

diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
index 73515d5..5062d1d 100644
--- a/drivers/usb/gadget/function/f_fs.c
+++ b/drivers/usb/gadget/function/f_fs.c
@@ -2227,8 +2227,8 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
 {
 	u32 str_count, needed_count, lang_count;
 	struct usb_gadget_strings **stringtabs, *t;
-	struct usb_string *strings, *s;
 	const char *data = _data;
+	struct usb_string *s;
 
 	ENTER();
 
@@ -2286,7 +2286,6 @@ static int __ffs_data_got_strings(struct ffs_data *ffs,
 		stringtabs = vla_ptr(vlabuf, d, stringtabs);
 		t = vla_ptr(vlabuf, d, stringtab);
 		s = vla_ptr(vlabuf, d, strings);
-		strings = s;
 	}
 
 	/* For each language */
diff --git a/drivers/usb/gadget/function/u_serial.c b/drivers/usb/gadget/function/u_serial.c
index 3580f19..6ded634 100644
--- a/drivers/usb/gadget/function/u_serial.c
+++ b/drivers/usb/gadget/function/u_serial.c
@@ -907,7 +907,6 @@ static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 {
 	struct gs_port	*port = tty->driver_data;
 	unsigned long	flags;
-	int		status;
 
 	pr_vdebug("gs_write: ttyGS%d (%p) writing %d bytes\n",
 			port->port_num, tty, count);
@@ -917,7 +916,7 @@ static int gs_write(struct tty_struct *tty, const unsigned char *buf, int count)
 		count = gs_buf_put(&port->port_write_buf, buf, count);
 	/* treat count == 0 as flush_chars() */
 	if (port->port_usb)
-		status = gs_start_tx(port);
+		gs_start_tx(port);
 	spin_unlock_irqrestore(&port->port_lock, flags);
 
 	return count;
diff --git a/drivers/usb/gadget/legacy/g_ffs.c b/drivers/usb/gadget/legacy/g_ffs.c
index f85639e..6da7316 100644
--- a/drivers/usb/gadget/legacy/g_ffs.c
+++ b/drivers/usb/gadget/legacy/g_ffs.c
@@ -265,7 +265,7 @@ static void *functionfs_acquire_dev(struct ffs_dev *dev)
 {
 	if (!try_module_get(THIS_MODULE))
 		return ERR_PTR(-ENOENT);
-	
+
 	return NULL;
 }
 
@@ -275,7 +275,7 @@ static void functionfs_release_dev(struct ffs_dev *dev)
 }
 
 /*
- * The caller of this function takes ffs_lock 
+ * The caller of this function takes ffs_lock
  */
 static int functionfs_ready_callback(struct ffs_data *ffs)
 {
@@ -294,12 +294,12 @@ static int functionfs_ready_callback(struct ffs_data *ffs)
 		++missing_funcs;
 		gfs_registered = false;
 	}
-	
+
 	return ret;
 }
 
 /*
- * The caller of this function takes ffs_lock 
+ * The caller of this function takes ffs_lock
  */
 static void functionfs_closed_callback(struct ffs_data *ffs)
 {
@@ -347,17 +347,14 @@ static int gfs_bind(struct usb_composite_dev *cdev)
 
 #ifdef CONFIG_USB_FUNCTIONFS_RNDIS
 	{
-		struct f_rndis_opts *rndis_opts;
-
 		fi_rndis = usb_get_function_instance("rndis");
 		if (IS_ERR(fi_rndis)) {
 			ret = PTR_ERR(fi_rndis);
 			goto error;
 		}
-		rndis_opts = container_of(fi_rndis, struct f_rndis_opts,
-					  func_inst);
 #ifndef CONFIG_USB_FUNCTIONFS_ETH
-		net = rndis_opts->net;
+		net = container_of(fi_rndis, struct f_rndis_opts,
+				   func_inst)->net;
 #endif
 	}
 #endif
diff --git a/drivers/usb/gadget/udc/amd5536udc.c b/drivers/usb/gadget/udc/amd5536udc.c
index 39d70b4..ea03ca7 100644
--- a/drivers/usb/gadget/udc/amd5536udc.c
+++ b/drivers/usb/gadget/udc/amd5536udc.c
@@ -2340,7 +2340,6 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
 	struct udc_ep *ep;
 	struct udc_request *req;
 	struct udc_data_dma *td;
-	unsigned dma_done;
 	unsigned len;
 
 	ep = &dev->ep[ep_ix];
@@ -2385,13 +2384,8 @@ static irqreturn_t udc_data_in_isr(struct udc *dev, int ep_ix)
 			 */
 			if (use_dma_ppb_du) {
 				td = udc_get_last_dma_desc(req);
-				if (td) {
-					dma_done =
-						AMD_GETBITS(td->status,
-						UDC_DMA_IN_STS_BS);
-					/* don't care DMA done */
+				if (td)
 					req->req.actual = req->req.length;
-				}
 			} else {
 				/* assume all bytes transferred */
 				req->req.actual = req->req.length;
@@ -3417,4 +3411,3 @@ module_pci_driver(udc_pci_driver);
 MODULE_DESCRIPTION(UDC_MOD_DESCRIPTION);
 MODULE_AUTHOR("Thomas Dahlmann");
 MODULE_LICENSE("GPL");
-
diff --git a/drivers/usb/gadget/udc/bdc/bdc_cmd.c b/drivers/usb/gadget/udc/bdc/bdc_cmd.c
index 6a4155c..4d5e918 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_cmd.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_cmd.c
@@ -57,7 +57,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 					u32 param0, u32 param1,	u32 param2)
 {
 	u32 temp, cmd_status;
-	int reset_bdc = 0;
 	int ret;
 
 	temp = bdc_readl(bdc->regs, BDC_CMDSC);
@@ -94,7 +93,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 
 	case BDC_CMDS_INTL:
 		dev_err(bdc->dev, "BDC Internal error\n");
-		reset_bdc = 1;
 		ret = -ECONNRESET;
 		break;
 
@@ -102,7 +100,6 @@ static int bdc_submit_cmd(struct bdc *bdc, u32 cmd_sc,
 		dev_err(bdc->dev,
 			"command timedout waited for %dusec\n",
 			BDC_CMD_TIMEOUT);
-		reset_bdc = 1;
 		ret = -ECONNRESET;
 		break;
 	default:
diff --git a/drivers/usb/gadget/udc/bdc/bdc_ep.c b/drivers/usb/gadget/udc/bdc/bdc_ep.c
index d619950..650717e 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_ep.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_ep.c
@@ -702,11 +702,9 @@ static int ep0_queue(struct bdc_ep *ep, struct bdc_req *req)
 /* Queue data stage */
 static int ep0_queue_data_stage(struct bdc *bdc)
 {
-	struct usb_request *ep0_usb_req;
 	struct bdc_ep *ep;
 
 	dev_dbg(bdc->dev, "%s\n", __func__);
-	ep0_usb_req = &bdc->ep0_req.usb_req;
 	ep = bdc->bdc_ep_array[1];
 	bdc->ep0_req.ep = ep;
 	bdc->ep0_req.usb_req.complete = NULL;
@@ -1393,10 +1391,8 @@ static int ep0_set_sel(struct bdc *bdc,
 {
 	struct bdc_ep	*ep;
 	u16	wLength;
-	u16	wValue;
 
 	dev_dbg(bdc->dev, "%s\n", __func__);
-	wValue = le16_to_cpu(setup_pkt->wValue);
 	wLength = le16_to_cpu(setup_pkt->wLength);
 	if (unlikely(wLength != 6)) {
 		dev_err(bdc->dev, "%s Wrong wLength:%d\n", __func__, wLength);
diff --git a/drivers/usb/gadget/udc/dummy_hcd.c b/drivers/usb/gadget/udc/dummy_hcd.c
index dde4445..77d0790 100644
--- a/drivers/usb/gadget/udc/dummy_hcd.c
+++ b/drivers/usb/gadget/udc/dummy_hcd.c
@@ -647,12 +647,10 @@ static int dummy_disable(struct usb_ep *_ep)
 static struct usb_request *dummy_alloc_request(struct usb_ep *_ep,
 		gfp_t mem_flags)
 {
-	struct dummy_ep		*ep;
 	struct dummy_request	*req;
 
 	if (!_ep)
 		return NULL;
-	ep = usb_ep_to_dummy_ep(_ep);
 
 	req = kzalloc(sizeof(*req), mem_flags);
 	if (!req)
@@ -2444,9 +2442,6 @@ static int dummy_start(struct usb_hcd *hcd)
 
 static void dummy_stop(struct usb_hcd *hcd)
 {
-	struct dummy		*dum;
-
-	dum = hcd_to_dummy_hcd(hcd)->dum;
 	device_remove_file(dummy_dev(hcd_to_dummy_hcd(hcd)), &dev_attr_urbs);
 	dev_info(dummy_dev(hcd_to_dummy_hcd(hcd)), "stopped\n");
 }
diff --git a/drivers/usb/gadget/udc/mv_udc_core.c b/drivers/usb/gadget/udc/mv_udc_core.c
index 81b6229..ce73b35 100644
--- a/drivers/usb/gadget/udc/mv_udc_core.c
+++ b/drivers/usb/gadget/udc/mv_udc_core.c
@@ -129,7 +129,7 @@ static int process_ep_req(struct mv_udc *udc, int index,
 {
 	struct mv_dtd	*curr_dtd;
 	struct mv_dqh	*curr_dqh;
-	int td_complete, actual, remaining_length;
+	int actual, remaining_length;
 	int i, direction;
 	int retval = 0;
 	u32 errors;
@@ -139,7 +139,6 @@ static int process_ep_req(struct mv_udc *udc, int index,
 	direction = index % 2;
 
 	curr_dtd = curr_req->head;
-	td_complete = 0;
 	actual = curr_req->req.length;
 
 	for (i = 0; i < curr_req->dtd_count; i++) {
@@ -412,11 +411,8 @@ static int req_to_dtd(struct mv_req *req)
 	unsigned count;
 	int is_last, is_first = 1;
 	struct mv_dtd *dtd, *last_dtd = NULL;
-	struct mv_udc *udc;
 	dma_addr_t dma;
 
-	udc = req->ep->udc;
-
 	do {
 		dtd = build_dtd(req, &count, &dma, &is_last);
 		if (dtd == NULL)
@@ -567,7 +563,7 @@ static int  mv_ep_disable(struct usb_ep *_ep)
 	struct mv_udc *udc;
 	struct mv_ep *ep;
 	struct mv_dqh *dqh;
-	u32 bit_pos, epctrlx, direction;
+	u32 epctrlx, direction;
 	unsigned long flags;
 
 	ep = container_of(_ep, struct mv_ep, ep);
@@ -582,7 +578,6 @@ static int  mv_ep_disable(struct usb_ep *_ep)
 	spin_lock_irqsave(&udc->lock, flags);
 
 	direction = ep_dir(ep);
-	bit_pos = 1 << ((direction == EP_DIR_OUT ? 0 : 16) + ep->ep_num);
 
 	/* Reset the max packet length and the interrupt on Setup */
 	dqh->max_packet_length = 0;
diff --git a/drivers/usb/gadget/udc/net2272.c b/drivers/usb/gadget/udc/net2272.c
index 18f5ebd..7c61134 100644
--- a/drivers/usb/gadget/udc/net2272.c
+++ b/drivers/usb/gadget/udc/net2272.c
@@ -329,12 +329,10 @@ static int net2272_disable(struct usb_ep *_ep)
 static struct usb_request *
 net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 {
-	struct net2272_ep *ep;
 	struct net2272_request *req;
 
 	if (!_ep)
 		return NULL;
-	ep = container_of(_ep, struct net2272_ep, ep);
 
 	req = kzalloc(sizeof(*req), gfp_flags);
 	if (!req)
@@ -348,10 +346,8 @@ net2272_alloc_request(struct usb_ep *_ep, gfp_t gfp_flags)
 static void
 net2272_free_request(struct usb_ep *_ep, struct usb_request *_req)
 {
-	struct net2272_ep *ep;
 	struct net2272_request *req;
 
-	ep = container_of(_ep, struct net2272_ep, ep);
 	if (!_ep || !_req)
 		return;
 
diff --git a/drivers/usb/gadget/udc/pch_udc.c b/drivers/usb/gadget/udc/pch_udc.c
index ebc51ec..48792fd 100644
--- a/drivers/usb/gadget/udc/pch_udc.c
+++ b/drivers/usb/gadget/udc/pch_udc.c
@@ -1730,14 +1730,14 @@ static int pch_udc_pcd_ep_disable(struct usb_ep *usbep)
 	if ((usbep->name == ep0_string) || !ep->ep.desc)
 		return -EINVAL;
 
-	spin_lock_irqsave(&ep->dev->lock, iflags);
+	spin_lock_irqsave(&dev->lock, iflags);
 	empty_req_queue(ep);
 	ep->halted = 1;
 	pch_udc_ep_disable(ep);
-	pch_udc_disable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
+	pch_udc_disable_ep_interrupts(dev, PCH_UDC_EPINT(ep->in, ep->num));
 	ep->ep.desc = NULL;
 	INIT_LIST_HEAD(&ep->queue);
-	spin_unlock_irqrestore(&ep->dev->lock, iflags);
+	spin_unlock_irqrestore(&dev->lock, iflags);
 	return 0;
 }
 
@@ -1767,10 +1767,10 @@ static struct usb_request *pch_udc_alloc_request(struct usb_ep *usbep,
 	req->req.dma = DMA_ADDR_INVALID;
 	req->dma = DMA_ADDR_INVALID;
 	INIT_LIST_HEAD(&req->queue);
-	if (!ep->dev->dma_addr)
+	if (!dev->dma_addr)
 		return &req->req;
 	/* ep0 in requests are allocated from data pool here */
-	dma_desc = pci_pool_alloc(ep->dev->data_requests, gfp,
+	dma_desc = pci_pool_alloc(dev->data_requests, gfp,
 				  &req->td_data_phys);
 	if (NULL == dma_desc) {
 		kfree(req);
@@ -1940,7 +1940,7 @@ static int pch_udc_pcd_dequeue(struct usb_ep *usbep,
 	if (!usbep || !usbreq || (!ep->ep.desc && ep->num))
 		return ret;
 	req = container_of(usbreq, struct pch_udc_request, req);
-	spin_lock_irqsave(&ep->dev->lock, flags);
+	spin_lock_irqsave(&dev->lock, flags);
 	/* make sure it's still queued on this endpoint */
 	list_for_each_entry(req, &ep->queue, queue) {
 		if (&req->req == usbreq) {
@@ -1951,7 +1951,7 @@ static int pch_udc_pcd_dequeue(struct usb_ep *usbep,
 			break;
 		}
 	}
-	spin_unlock_irqrestore(&ep->dev->lock, flags);
+	spin_unlock_irqrestore(&dev->lock, flags);
 	return ret;
 }
 
@@ -1976,17 +1976,16 @@ static int pch_udc_pcd_set_halt(struct usb_ep *usbep, int halt)
 	ep = container_of(usbep, struct pch_udc_ep, ep);
 	if (!ep->ep.desc && !ep->num)
 		return -EINVAL;
-	if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
+	if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
 		return -ESHUTDOWN;
 	spin_lock_irqsave(&udc_stall_spinlock, iflags);
 	if (list_empty(&ep->queue)) {
 		if (halt) {
 			if (ep->num == PCH_UDC_EP0)
-				ep->dev->stall = 1;
+				dev->stall = 1;
 			pch_udc_ep_set_stall(ep);
-			pch_udc_enable_ep_interrupts(ep->dev,
-						     PCH_UDC_EPINT(ep->in,
-								   ep->num));
+			pch_udc_enable_ep_interrupts(
+				dev, PCH_UDC_EPINT(ep->in, ep->num));
 		} else {
 			pch_udc_ep_clear_stall(ep);
 		}
@@ -2019,18 +2018,18 @@ static int pch_udc_pcd_set_wedge(struct usb_ep *usbep)
 	ep = container_of(usbep, struct pch_udc_ep, ep);
 	if (!ep->ep.desc && !ep->num)
 		return -EINVAL;
-	if (!ep->dev->driver || (ep->dev->gadget.speed == USB_SPEED_UNKNOWN))
+	if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
 		return -ESHUTDOWN;
 	spin_lock_irqsave(&udc_stall_spinlock, iflags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
 	} else {
 		if (ep->num == PCH_UDC_EP0)
-			ep->dev->stall = 1;
+			dev->stall = 1;
 		pch_udc_ep_set_stall(ep);
-		pch_udc_enable_ep_interrupts(ep->dev,
+		pch_udc_enable_ep_interrupts(dev,
 					     PCH_UDC_EPINT(ep->in, ep->num));
-		ep->dev->prot_stall = 1;
+		dev->prot_stall = 1;
 		ret = 0;
 	}
 	spin_unlock_irqrestore(&udc_stall_spinlock, iflags);
@@ -2451,16 +2450,11 @@ static void pch_udc_svc_control_out(struct pch_udc_dev *dev)
  */
 static void pch_udc_postsvc_epinters(struct pch_udc_dev *dev, int ep_num)
 {
-	struct pch_udc_ep	*ep;
-	struct pch_udc_request *req;
-
-	ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
-	if (!list_empty(&ep->queue)) {
-		req = list_entry(ep->queue.next, struct pch_udc_request, queue);
-		pch_udc_enable_ep_interrupts(ep->dev,
-					     PCH_UDC_EPINT(ep->in, ep->num));
-		pch_udc_ep_clear_nak(ep);
-	}
+	struct pch_udc_ep	*ep = &dev->ep[UDC_EPIN_IDX(ep_num)];
+	if (list_empty(&ep->queue))
+		return;
+	pch_udc_enable_ep_interrupts(ep->dev, PCH_UDC_EPINT(ep->in, ep->num));
+	pch_udc_ep_clear_nak(ep);
 }
 
 /**
diff --git a/drivers/usb/gadget/udc/pxa27x_udc.c b/drivers/usb/gadget/udc/pxa27x_udc.c
index 001a3b7..72aca2f 100644
--- a/drivers/usb/gadget/udc/pxa27x_udc.c
+++ b/drivers/usb/gadget/udc/pxa27x_udc.c
@@ -1829,9 +1829,6 @@ static void stop_activity(struct pxa_udc *udc, struct usb_gadget_driver *driver)
 {
 	int i;
 
-	/* don't disconnect drivers more than once */
-	if (udc->gadget.speed == USB_SPEED_UNKNOWN)
-		driver = NULL;
 	udc->gadget.speed = USB_SPEED_UNKNOWN;
 
 	for (i = 0; i < NR_USB_ENDPOINTS; i++)
diff --git a/drivers/usb/gadget/udc/udc-xilinx.c b/drivers/usb/gadget/udc/udc-xilinx.c
index 1cbb0ac..f8bf290 100644
--- a/drivers/usb/gadget/udc/udc-xilinx.c
+++ b/drivers/usb/gadget/udc/udc-xilinx.c
@@ -2055,7 +2055,6 @@ static int xudc_probe(struct platform_device *pdev)
 	struct device_node *np = pdev->dev.of_node;
 	struct resource *res;
 	struct xusb_udc *udc;
-	struct xusb_ep *ep0;
 	int irq;
 	int ret;
 	u32 ier;
@@ -2119,8 +2118,6 @@ static int xudc_probe(struct platform_device *pdev)
 
 	xudc_eps_init(udc);
 
-	ep0 = &udc->ep[0];
-
 	/* Set device address to 0.*/
 	udc->write_fn(udc->addr, XUSB_ADDRESS_OFFSET, 0);
 
-- 
2.8.0.rc3.226.g39d4020

[PATCHv2 2/4] usb: gadget: m66592: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/m66592-udc.c: In function ‘m66592_irq’:
drivers/usb/gadget/udc/m66592-udc.c:1203:15: warning: variable ‘nrdyenb’ set but not used [-Wunused-but-set-variable]
  u16 brdyenb, nrdyenb, bempenb;
               ^
drivers/usb/gadget/udc/m66592-udc.c:1202:15: warning: variable ‘nrdysts’ set but not used [-Wunused-but-set-variable]
  u16 brdysts, nrdysts, bempsts;
               ^

In doing so, it removes calls to m66592_read function which does I/O
with the device, but I hope the reads don’t have any side effects that
are needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 drivers/usb/gadget/udc/m66592-udc.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/udc/m66592-udc.c b/drivers/usb/gadget/udc/m66592-udc.c
index b1cfa96..6e977dc 100644
--- a/drivers/usb/gadget/udc/m66592-udc.c
+++ b/drivers/usb/gadget/udc/m66592-udc.c
@@ -1199,8 +1199,6 @@ static irqreturn_t m66592_irq(int irq, void *_m66592)
 	struct m66592 *m66592 = _m66592;
 	u16 intsts0;
 	u16 intenb0;
-	u16 brdysts, nrdysts, bempsts;
-	u16 brdyenb, nrdyenb, bempenb;
 	u16 savepipe;
 	u16 mask0;
 
@@ -1224,12 +1222,10 @@ static irqreturn_t m66592_irq(int irq, void *_m66592)
 
 	mask0 = intsts0 & intenb0;
 	if (mask0) {
-		brdysts = m66592_read(m66592, M66592_BRDYSTS);
-		nrdysts = m66592_read(m66592, M66592_NRDYSTS);
-		bempsts = m66592_read(m66592, M66592_BEMPSTS);
-		brdyenb = m66592_read(m66592, M66592_BRDYENB);
-		nrdyenb = m66592_read(m66592, M66592_NRDYENB);
-		bempenb = m66592_read(m66592, M66592_BEMPENB);
+		u16 brdysts = m66592_read(m66592, M66592_BRDYSTS);
+		u16 bempsts = m66592_read(m66592, M66592_BEMPSTS);
+		u16 brdyenb = m66592_read(m66592, M66592_BRDYENB);
+		u16 bempenb = m66592_read(m66592, M66592_BEMPENB);
 
 		if (mask0 & M66592_VBINT) {
 			m66592_write(m66592,  0xffff & ~M66592_VBINT,
@@ -1408,28 +1404,20 @@ static int m66592_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 
 static int m66592_set_halt(struct usb_ep *_ep, int value)
 {
-	struct m66592_ep *ep;
-	struct m66592_request *req;
+	struct m66592_ep *ep = container_of(_ep, struct m66592_ep, ep);
 	unsigned long flags;
 	int ret = 0;
 
-	ep = container_of(_ep, struct m66592_ep, ep);
-	req = list_entry(ep->queue.next, struct m66592_request, queue);
-
 	spin_lock_irqsave(&ep->m66592->lock, flags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
-		goto out;
-	}
-	if (value) {
+	} else if (value) {
 		ep->busy = 1;
 		pipe_stall(ep->m66592, ep->pipenum);
 	} else {
 		ep->busy = 0;
 		pipe_stop(ep->m66592, ep->pipenum);
 	}
-
-out:
 	spin_unlock_irqrestore(&ep->m66592->lock, flags);
 	return ret;
 }
-- 
2.8.0.rc3.226.g39d4020

[PATCHv2 3/4] usb: gadget: r8a66597: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/r8a66597-udc.c: In function ‘r8a66597_irq’:
drivers/usb/gadget/udc/r8a66597-udc.c:1468:15: warning: variable ‘nrdyenb’ set but not used [-Wunused-but-set-variable]
  u16 brdyenb, nrdyenb, bempenb;
               ^
drivers/usb/gadget/udc/r8a66597-udc.c:1467:15: warning: variable ‘nrdysts’ set but not used [-Wunused-but-set-variable]
  u16 brdysts, nrdysts, bempsts;
               ^

In doing so, it removes calls to r8a66597_read function which does I/O
with the device, but I hope the reads don’t have any side effects that
are needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 drivers/usb/gadget/udc/r8a66597-udc.c | 24 ++++++------------------
 1 file changed, 6 insertions(+), 18 deletions(-)

diff --git a/drivers/usb/gadget/udc/r8a66597-udc.c b/drivers/usb/gadget/udc/r8a66597-udc.c
index 8b300e6..f2c8862 100644
--- a/drivers/usb/gadget/udc/r8a66597-udc.c
+++ b/drivers/usb/gadget/udc/r8a66597-udc.c
@@ -1464,8 +1464,6 @@ static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
 	struct r8a66597 *r8a66597 = _r8a66597;
 	u16 intsts0;
 	u16 intenb0;
-	u16 brdysts, nrdysts, bempsts;
-	u16 brdyenb, nrdyenb, bempenb;
 	u16 savepipe;
 	u16 mask0;
 
@@ -1481,12 +1479,10 @@ static irqreturn_t r8a66597_irq(int irq, void *_r8a66597)
 
 	mask0 = intsts0 & intenb0;
 	if (mask0) {
-		brdysts = r8a66597_read(r8a66597, BRDYSTS);
-		nrdysts = r8a66597_read(r8a66597, NRDYSTS);
-		bempsts = r8a66597_read(r8a66597, BEMPSTS);
-		brdyenb = r8a66597_read(r8a66597, BRDYENB);
-		nrdyenb = r8a66597_read(r8a66597, NRDYENB);
-		bempenb = r8a66597_read(r8a66597, BEMPENB);
+		u16 brdysts = r8a66597_read(r8a66597, BRDYSTS);
+		u16 bempsts = r8a66597_read(r8a66597, BEMPSTS);
+		u16 brdyenb = r8a66597_read(r8a66597, BRDYENB);
+		u16 bempenb = r8a66597_read(r8a66597, BEMPENB);
 
 		if (mask0 & VBINT) {
 			r8a66597_write(r8a66597,  0xffff & ~VBINT,
@@ -1658,20 +1654,14 @@ static int r8a66597_dequeue(struct usb_ep *_ep, struct usb_request *_req)
 
 static int r8a66597_set_halt(struct usb_ep *_ep, int value)
 {
-	struct r8a66597_ep *ep;
-	struct r8a66597_request *req;
+	struct r8a66597_ep *ep = container_of(_ep, struct r8a66597_ep, ep);
 	unsigned long flags;
 	int ret = 0;
 
-	ep = container_of(_ep, struct r8a66597_ep, ep);
-	req = get_request_from_ep(ep);
-
 	spin_lock_irqsave(&ep->r8a66597->lock, flags);
 	if (!list_empty(&ep->queue)) {
 		ret = -EAGAIN;
-		goto out;
-	}
-	if (value) {
+	} else if (value) {
 		ep->busy = 1;
 		pipe_stall(ep->r8a66597, ep->pipenum);
 	} else {
@@ -1679,8 +1669,6 @@ static int r8a66597_set_halt(struct usb_ep *_ep, int value)
 		ep->wedge = 0;
 		pipe_stop(ep->r8a66597, ep->pipenum);
 	}
-
-out:
 	spin_unlock_irqrestore(&ep->r8a66597->lock, flags);
 	return ret;
 }
-- 
2.8.0.rc3.226.g39d4020

[PATCHv2 4/4] usb: gadget: mv_u3d: fix unused-but-set-variable warnings

[Michal Nazarewicz]

This patch fixes the following (W=1) warnings:

drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_process_ep_req’:
drivers/usb/gadget/udc/mv_u3d_core.c:124:6: warning: variable ‘trb_complete’ set but not used [-Wunused-but-set-variable]
  int trb_complete, actual, remaining_length = 0;
      ^
drivers/usb/gadget/udc/mv_u3d_core.c:123:28: warning: variable ‘curr_ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *curr_ep_context;
                            ^
drivers/usb/gadget/udc/mv_u3d_core.c:122:13: warning: variable ‘cur_deq_lo’ set but not used [-Wunused-but-set-variable]
  dma_addr_t cur_deq_lo;
             ^
drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_ep_enable’:
drivers/usb/gadget/udc/mv_u3d_core.c:530:28: warning: variable ‘ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *ep_context;
                            ^
drivers/usb/gadget/udc/mv_u3d_core.c: In function ‘mv_u3d_ep_disable’:
drivers/usb/gadget/udc/mv_u3d_core.c:636:28: warning: variable ‘ep_context’ set but not used [-Wunused-but-set-variable]
  struct mv_u3d_ep_context *ep_context;
                            ^
In doing so, it removes calls to ioread32 function which does I/O with
the device, but I hope the reads don’t have any side effects that are
needed.

Signed-off-by: Michal Nazarewicz <mina86@mina86.com>
---
 drivers/usb/gadget/udc/mv_u3d_core.c | 23 +++--------------------
 1 file changed, 3 insertions(+), 20 deletions(-)

diff --git a/drivers/usb/gadget/udc/mv_u3d_core.c b/drivers/usb/gadget/udc/mv_u3d_core.c
index dafe74e..b9e19a5 100644
--- a/drivers/usb/gadget/udc/mv_u3d_core.c
+++ b/drivers/usb/gadget/udc/mv_u3d_core.c
@@ -119,18 +119,14 @@ static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index,
 	struct mv_u3d_req *curr_req)
 {
 	struct mv_u3d_trb	*curr_trb;
-	dma_addr_t cur_deq_lo;
-	struct mv_u3d_ep_context	*curr_ep_context;
-	int trb_complete, actual, remaining_length = 0;
+	int actual, remaining_length = 0;
 	int direction, ep_num;
 	int retval = 0;
 	u32 tmp, status, length;
 
-	curr_ep_context = &u3d->ep_context[index];
 	direction = index % 2;
 	ep_num = index / 2;
 
-	trb_complete = 0;
 	actual = curr_req->req.length;
 
 	while (!list_empty(&curr_req->trb_list)) {
@@ -143,15 +139,10 @@ static int mv_u3d_process_ep_req(struct mv_u3d *u3d, int index,
 		}
 
 		curr_trb->trb_hw->ctrl.own = 0;
-		if (direction == MV_U3D_EP_DIR_OUT) {
+		if (direction == MV_U3D_EP_DIR_OUT)
 			tmp = ioread32(&u3d->vuc_regs->rxst[ep_num].statuslo);
-			cur_deq_lo =
-				ioread32(&u3d->vuc_regs->rxst[ep_num].curdeqlo);
-		} else {
+		else
 			tmp = ioread32(&u3d->vuc_regs->txst[ep_num].statuslo);
-			cur_deq_lo =
-				ioread32(&u3d->vuc_regs->txst[ep_num].curdeqlo);
-		}
 
 		status = tmp >> MV_U3D_XFERSTATUS_COMPLETE_SHIFT;
 		length = tmp & MV_U3D_XFERSTATUS_TRB_LENGTH_MASK;
@@ -527,7 +518,6 @@ static int mv_u3d_ep_enable(struct usb_ep *_ep,
 {
 	struct mv_u3d *u3d;
 	struct mv_u3d_ep *ep;
-	struct mv_u3d_ep_context *ep_context;
 	u16 max = 0;
 	unsigned maxburst = 0;
 	u32 epxcr, direction;
@@ -548,9 +538,6 @@ static int mv_u3d_ep_enable(struct usb_ep *_ep,
 		_ep->maxburst = 1;
 	maxburst = _ep->maxburst;
 
-	/* Get the endpoint context address */
-	ep_context = (struct mv_u3d_ep_context *)ep->ep_context;
-
 	/* Set the max burst size */
 	switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
 	case USB_ENDPOINT_XFER_BULK:
@@ -633,7 +620,6 @@ static int  mv_u3d_ep_disable(struct usb_ep *_ep)
 {
 	struct mv_u3d *u3d;
 	struct mv_u3d_ep *ep;
-	struct mv_u3d_ep_context *ep_context;
 	u32 epxcr, direction;
 	unsigned long flags;
 
@@ -646,9 +632,6 @@ static int  mv_u3d_ep_disable(struct usb_ep *_ep)
 
 	u3d = ep->u3d;
 
-	/* Get the endpoint context address */
-	ep_context = ep->ep_context;
-
 	direction = mv_u3d_ep_dir(ep);
 
 	/* nuke all pending requests (does flush) */
-- 
2.8.0.rc3.226.g39d4020

Re: [PATCHv2 1/4] usb: gadget: fix unused-but-set-variale warnings

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 4107 bytes --]

Hi,

[auto build test ERROR on balbi-usb/next]
[also build test ERROR on v4.7-rc1 next-20160603]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Michal-Nazarewicz/usb-gadget-fix-unused-but-set-variale-warnings/20160531-202120
base:   https://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git next
config: x86_64-randconfig-h0-06050347 (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   In file included from include/linux/seqlock.h:35:0,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:18,
                    from include/linux/module.h:10,
                    from drivers/usb/gadget/udc/pch_udc.c:10:
   drivers/usb/gadget/udc/pch_udc.c: In function 'pch_udc_pcd_ep_disable':
>> drivers/usb/gadget/udc/pch_udc.c:1733:21: error: 'dev' undeclared (first use in this function)
     spin_lock_irqsave(&dev->lock, iflags);
                        ^
   include/linux/spinlock.h:208:34: note: in definition of macro 'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^~~~
   drivers/usb/gadget/udc/pch_udc.c:1733:2: note: in expansion of macro 'spin_lock_irqsave'
     spin_lock_irqsave(&dev->lock, iflags);
     ^~~~~~~~~~~~~~~~~
   drivers/usb/gadget/udc/pch_udc.c:1733:21: note: each undeclared identifier is reported only once for each function it appears in
     spin_lock_irqsave(&dev->lock, iflags);
                        ^
   include/linux/spinlock.h:208:34: note: in definition of macro 'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^~~~
   drivers/usb/gadget/udc/pch_udc.c:1733:2: note: in expansion of macro 'spin_lock_irqsave'
     spin_lock_irqsave(&dev->lock, iflags);
     ^~~~~~~~~~~~~~~~~
   drivers/usb/gadget/udc/pch_udc.c: In function 'pch_udc_alloc_request':
   drivers/usb/gadget/udc/pch_udc.c:1770:7: error: 'dev' undeclared (first use in this function)
     if (!dev->dma_addr)
          ^~~
   In file included from include/linux/seqlock.h:35:0,
                    from include/linux/time.h:5,
                    from include/linux/stat.h:18,
                    from include/linux/module.h:10,
                    from drivers/usb/gadget/udc/pch_udc.c:10:
   drivers/usb/gadget/udc/pch_udc.c: In function 'pch_udc_pcd_dequeue':
   drivers/usb/gadget/udc/pch_udc.c:1943:21: error: 'dev' undeclared (first use in this function)
     spin_lock_irqsave(&dev->lock, flags);
                        ^
   include/linux/spinlock.h:208:34: note: in definition of macro 'raw_spin_lock_irqsave'
      flags = _raw_spin_lock_irqsave(lock); \
                                     ^~~~
   drivers/usb/gadget/udc/pch_udc.c:1943:2: note: in expansion of macro 'spin_lock_irqsave'
     spin_lock_irqsave(&dev->lock, flags);
     ^~~~~~~~~~~~~~~~~
   drivers/usb/gadget/udc/pch_udc.c: In function 'pch_udc_pcd_set_halt':
   drivers/usb/gadget/udc/pch_udc.c:1979:7: error: 'dev' undeclared (first use in this function)
     if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
          ^~~
   drivers/usb/gadget/udc/pch_udc.c: In function 'pch_udc_pcd_set_wedge':
   drivers/usb/gadget/udc/pch_udc.c:2021:7: error: 'dev' undeclared (first use in this function)
     if (!dev->driver || (dev->gadget.speed == USB_SPEED_UNKNOWN))
          ^~~

vim +/dev +1733 drivers/usb/gadget/udc/pch_udc.c

  1727			return -EINVAL;
  1728	
  1729		ep = container_of(usbep, struct pch_udc_ep, ep);
  1730		if ((usbep->name == ep0_string) || !ep->ep.desc)
  1731			return -EINVAL;
  1732	
> 1733		spin_lock_irqsave(&dev->lock, iflags);
  1734		empty_req_queue(ep);
  1735		ep->halted = 1;
  1736		pch_udc_ep_disable(ep);

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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