[PATCH 00/15] drivers: usb: misc: update to use usb_control_msg_{send|recv}()

[PATCH 00/15] drivers: usb: misc: update to use usb_control_msg_{send|recv}()

[Anant Thazhemadam]

The new usb_control_msg_{send|recv}() API provides an improved way of 
using usb_control_msg(). Using this, short reads/writes are considered
as errors, data can be used off the stack, and the need for the calling
function to create a raw usb pipe is eliminated.
This patch series aims to update existing instances of usb_control_msg() 
in drivers/usb/misc to usb_control_msg_{send|recv}() appropriately, and
also update the return value checking mechanisms in place (if any), as
necessary so nothing breaks.

I was however unable to update one instance of usb_control_msg() in 
drivers/usb/misc/apple-mfi-fastcharge.c.

The return value checking mechanism present here, is as follows.
	if (retval) {
		dev_dbg(&mfi->udev->dev, "retval = %d\n", retval);
		return retval;
	}

	mfi->charge_type = val->intval;

	return 0;

This implies that mfi->charge_type = val->intval only when number of
bytes transferred = 0, and the return value is directly returned 
otherwise. Since the new API doesn't return the number of bytes 
transferred, I wasn't quite sure how this instance could be updated.
In case this check is logically incorrect, a patch with a fix 
can be sent in as well.


Anant Thazhemadam (15):
  usb: misc: appledisplay: update to use the
    usb_control_msg_{send|recv}() API
  usb: misc: cypress_cy7c63: update to use usb_control_msg_recv()
  usb: misc: cytherm: update to use usb_control_msg_recv()
  usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API
  usb: misc: emi26: update to use usb_control_msg_send()
  usb: misc: emi62: update to use usb_control_msg_send()
  usb: misc: ezusb: update to use usb_control_msg_send()
  usb: misc: idmouse: update to use usb_control_msg_send()
  usb: misc: iowarrior: update to use the usb_control_msg_{send|recv}()
    API
  usb: misc: isight_firmware: update to use usb_control_msg_send()
  usb: misc: ldusb: update to use usb_control_msg_send()
  usb: misc: lvstest: update to use the usb_control_msg_{send|recv}()
    API
  usb: misc: trancevibrator: update to use usb_control_msg_send()
  usb: misc: usbsevseg: update to use usb_control_msg_send()
  usb: misc: usbtest: update to use the usb_control_msg_{send|recv}()
    API

 drivers/usb/misc/appledisplay.c    | 46 ++++++++------------
 drivers/usb/misc/cypress_cy7c63.c  | 10 ++---
 drivers/usb/misc/cytherm.c         | 42 +++++++++---------
 drivers/usb/misc/ehset.c           | 70 +++++++++++++-----------------
 drivers/usb/misc/emi26.c           | 14 +-----
 drivers/usb/misc/emi62.c           | 14 +-----
 drivers/usb/misc/ezusb.c           | 16 +------
 drivers/usb/misc/idmouse.c         |  5 ++-
 drivers/usb/misc/iowarrior.c       | 34 +++++++--------
 drivers/usb/misc/isight_firmware.c | 22 +++++-----
 drivers/usb/misc/ldusb.c           |  8 ++--
 drivers/usb/misc/lvstest.c         | 30 ++++++-------
 drivers/usb/misc/trancevibrator.c  |  6 +--
 drivers/usb/misc/usbsevseg.c       | 52 +++++++---------------
 drivers/usb/misc/usbtest.c         | 63 +++++++++++++--------------
 15 files changed, 180 insertions(+), 252 deletions(-)

-- 
2.25.1

[PATCH 01/15] usb: misc: appledisplay: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}(), and all return value checking
conditions have also been modified appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/appledisplay.c | 46 ++++++++++++++-------------------
 1 file changed, 19 insertions(+), 27 deletions(-)

diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
index c8098e9b432e..117deb2fdc29 100644
--- a/drivers/usb/misc/appledisplay.c
+++ b/drivers/usb/misc/appledisplay.c
@@ -132,21 +132,17 @@ static int appledisplay_bl_update_status(struct backlight_device *bd)
 	pdata->msgdata[0] = 0x10;
 	pdata->msgdata[1] = bd->props.brightness;
 
-	retval = usb_control_msg(
-		pdata->udev,
-		usb_sndctrlpipe(pdata->udev, 0),
-		USB_REQ_SET_REPORT,
-		USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
-		ACD_USB_BRIGHTNESS,
-		0,
-		pdata->msgdata, 2,
-		ACD_USB_TIMEOUT);
+	retval = usb_control_msg_send(pdata->udev,
+				      0,
+				      USB_REQ_SET_REPORT,
+				      USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				      ACD_USB_BRIGHTNESS,
+				      0,
+				      pdata->msgdata, 2,
+				      ACD_USB_TIMEOUT, GFP_KERNEL);
 	mutex_unlock(&pdata->sysfslock);
 
-	if (retval < 0)
-		return retval;
-	else
-		return 0;
+	return retval;
 }
 
 static int appledisplay_bl_get_brightness(struct backlight_device *bd)
@@ -155,21 +151,17 @@ static int appledisplay_bl_get_brightness(struct backlight_device *bd)
 	int retval, brightness;
 
 	mutex_lock(&pdata->sysfslock);
-	retval = usb_control_msg(
-		pdata->udev,
-		usb_rcvctrlpipe(pdata->udev, 0),
-		USB_REQ_GET_REPORT,
-		USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
-		ACD_USB_BRIGHTNESS,
-		0,
-		pdata->msgdata, 2,
-		ACD_USB_TIMEOUT);
-	if (retval < 2) {
-		if (retval >= 0)
-			retval = -EMSGSIZE;
-	} else {
+	retval = usb_control_msg_recv(pdata->udev,
+				      0,
+				      USB_REQ_GET_REPORT,
+				      USB_DIR_IN | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				      ACD_USB_BRIGHTNESS,
+				      0,
+				      pdata->msgdata, 2,
+				      ACD_USB_TIMEOUT, GFP_KERNEL);
+	if (retval == 0)
 		brightness = pdata->msgdata[1];
-	}
+
 	mutex_unlock(&pdata->sysfslock);
 
 	if (retval < 0)
-- 
2.25.1

[PATCH 02/15] usb: misc: cypress_cy7c63: update to use usb_control_msg_recv()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_recv().

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/cypress_cy7c63.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/misc/cypress_cy7c63.c b/drivers/usb/misc/cypress_cy7c63.c
index 14faec51d7a5..fc09251fc87c 100644
--- a/drivers/usb/misc/cypress_cy7c63.c
+++ b/drivers/usb/misc/cypress_cy7c63.c
@@ -70,7 +70,6 @@ static int vendor_command(struct cypress *dev, unsigned char request,
 			  unsigned char address, unsigned char data)
 {
 	int retval = 0;
-	unsigned int pipe;
 	unsigned char *iobuf;
 
 	/* allocate some memory for the i/o buffer*/
@@ -83,11 +82,10 @@ static int vendor_command(struct cypress *dev, unsigned char request,
 	dev_dbg(&dev->udev->dev, "Sending usb_control_msg (data: %d)\n", data);
 
 	/* prepare usb control message and send it upstream */
-	pipe = usb_rcvctrlpipe(dev->udev, 0);
-	retval = usb_control_msg(dev->udev, pipe, request,
-				 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
-				 address, data, iobuf, CYPRESS_MAX_REQSIZE,
-				 USB_CTRL_GET_TIMEOUT);
+	retval = usb_control_msg_recv(dev->udev, 0, request,
+				      USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+				      address, data, iobuf, CYPRESS_MAX_REQSIZE,
+				      USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 
 	/* store returned data (more READs to be added) */
 	switch (request) {
-- 
2.25.1

[PATCH 03/15] usb: misc: cytherm: update to use usb_control_msg_recv()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_recv().

The return value checking enforced by callers of the updated function have
also been appropriately updated.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/cytherm.c | 42 +++++++++++++++++++-------------------
 1 file changed, 21 insertions(+), 21 deletions(-)

diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c
index 3e3802aaefa3..75fa4d806a77 100644
--- a/drivers/usb/misc/cytherm.c
+++ b/drivers/usb/misc/cytherm.c
@@ -51,12 +51,12 @@ static int vendor_command(struct usb_device *dev, unsigned char request,
 			  unsigned char value, unsigned char index,
 			  void *buf, int size)
 {
-	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-			       request, 
-			       USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
-			       value, 
-			       index, buf, size,
-			       USB_CTRL_GET_TIMEOUT);
+	return usb_control_msg_recv(dev, 0,
+				    request,
+				    USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
+				    value,
+				    index, buf, size,
+				    USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 }
 
 
@@ -95,14 +95,14 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *att
 	/* Set brightness */
 	retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS, 
 				cytherm->brightness, buffer, 8);
-	if (retval)
-		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+	if (!retval)
+		dev_dbg(&cytherm->udev->dev, "brightness set correctly\n");
 	/* Inform µC that we have changed the brightness setting */
 	retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
 				0x01, buffer, 8);
-	if (retval)
-		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
-   
+	if (!retval)
+		dev_dbg(&cytherm->udev->dev, "µC informed of change in brightness setting\n");
+
 	kfree(buffer);
    
 	return count;
@@ -130,14 +130,14 @@ static ssize_t temp_show(struct device *dev, struct device_attribute *attr, char
 
 	/* read temperature */
 	retval = vendor_command(cytherm->udev, READ_RAM, TEMP, 0, buffer, 8);
-	if (retval)
-		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+	if (!retval)
+		dev_dbg(&cytherm->udev->dev, "read temperature successfully\n");
 	temp = buffer[1];
    
 	/* read sign */
 	retval = vendor_command(cytherm->udev, READ_RAM, SIGN, 0, buffer, 8);
-	if (retval)
-		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+	if (!retval)
+		dev_dbg(&cytherm->udev->dev, "read sign successfully\n");
 	sign = buffer[1];
 
 	kfree(buffer);
@@ -165,8 +165,8 @@ static ssize_t button_show(struct device *dev, struct device_attribute *attr, ch
 
 	/* check button */
 	retval = vendor_command(cytherm->udev, READ_RAM, BUTTON, 0, buffer, 8);
-	if (retval)
-		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
+	if (!retval)
+		dev_dbg(&cytherm->udev->dev, "checked button successfully\n");
    
 	retval = buffer[1];
 
@@ -193,7 +193,7 @@ static ssize_t port0_show(struct device *dev, struct device_attribute *attr, cha
 		return 0;
 
 	retval = vendor_command(cytherm->udev, READ_PORT, 0, 0, buffer, 8);
-	if (retval)
+	if (!retval)
 		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
 
 	retval = buffer[1];
@@ -226,7 +226,7 @@ static ssize_t port0_store(struct device *dev, struct device_attribute *attr, co
    
 	retval = vendor_command(cytherm->udev, WRITE_PORT, 0,
 				tmp, buffer, 8);
-	if (retval)
+	if (!retval)
 		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
 
 	kfree(buffer);
@@ -248,7 +248,7 @@ static ssize_t port1_show(struct device *dev, struct device_attribute *attr, cha
 		return 0;
 
 	retval = vendor_command(cytherm->udev, READ_PORT, 1, 0, buffer, 8);
-	if (retval)
+	if (!retval)
 		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
    
 	retval = buffer[1];
@@ -281,7 +281,7 @@ static ssize_t port1_store(struct device *dev, struct device_attribute *attr, co
    
 	retval = vendor_command(cytherm->udev, WRITE_PORT, 1,
 				tmp, buffer, 8);
-	if (retval)
+	if (!retval)
 		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
 
 	kfree(buffer);
-- 
2.25.1

[PATCH 04/15] usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/ehset.c | 70 ++++++++++++++++++----------------------
 1 file changed, 31 insertions(+), 39 deletions(-)

diff --git a/drivers/usb/misc/ehset.c b/drivers/usb/misc/ehset.c
index 2752e1f4f4d0..068f4fae2965 100644
--- a/drivers/usb/misc/ehset.c
+++ b/drivers/usb/misc/ehset.c
@@ -30,48 +30,42 @@ static int ehset_probe(struct usb_interface *intf,
 
 	switch (test_pid) {
 	case TEST_SE0_NAK_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_SE0_NAK << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_SE0_NAK << 8) | portnum,
+					   NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_J_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_J << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_J << 8) | portnum, NULL, 0,
+					   1000, GFP_KERNEL);
 		break;
 	case TEST_K_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_K << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_K << 8) | portnum, NULL, 0,
+					   1000, GFP_KERNEL);
 		break;
 	case TEST_PACKET_PID:
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(USB_TEST_PACKET << 8) | portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (USB_TEST_PACKET << 8) | portnum,
+					   NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_HS_HOST_PORT_SUSPEND_RESUME:
 		/* Test: wait for 15secs -> suspend -> 15secs delay -> resume */
 		msleep(15 * 1000);
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_SUSPEND, portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
+					   portnum, NULL, 0, 1000, GFP_KERNEL);
 		if (ret < 0)
 			break;
 
 		msleep(15 * 1000);
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_CLEAR_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_SUSPEND, portnum,
-					NULL, 0, 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_CLEAR_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
+					   portnum, NULL, 0, 1000, GFP_KERNEL);
 		break;
 	case TEST_SINGLE_STEP_GET_DEV_DESC:
 		/* Test: wait for 15secs -> GetDescriptor request */
@@ -80,11 +74,10 @@ static int ehset_probe(struct usb_interface *intf,
 		if (!buf)
 			return -ENOMEM;
 
-		ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
-					USB_DT_DEVICE << 8, 0,
-					buf, USB_DT_DEVICE_SIZE,
-					USB_CTRL_GET_TIMEOUT);
+		ret = usb_control_msg_recv(dev, 0, USB_REQ_GET_DESCRIPTOR,
+					   USB_DIR_IN, USB_DT_DEVICE << 8, 0,
+					   buf, USB_DT_DEVICE_SIZE,
+					   USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 		kfree(buf);
 		break;
 	case TEST_SINGLE_STEP_SET_FEATURE:
@@ -100,11 +93,10 @@ static int ehset_probe(struct usb_interface *intf,
 			break;
 		}
 
-		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
-					USB_REQ_SET_FEATURE, USB_RT_PORT,
-					USB_PORT_FEAT_TEST,
-					(6 << 8) | portnum,
-					NULL, 0, 60 * 1000);
+		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
+					   USB_RT_PORT, USB_PORT_FEAT_TEST,
+					   (6 << 8) | portnum, NULL, 0,
+					   60 * 1000, GFP_KERNEL);
 
 		break;
 	default:
@@ -112,7 +104,7 @@ static int ehset_probe(struct usb_interface *intf,
 			__func__, test_pid);
 	}
 
-	return (ret < 0) ? ret : 0;
+	return ret;
 }
 
 static void ehset_disconnect(struct usb_interface *intf)
-- 
2.25.1

[PATCH 05/15] usb: misc: emi26: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/emi26.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/misc/emi26.c b/drivers/usb/misc/emi26.c
index 24d841850e05..1093809d34ad 100644
--- a/drivers/usb/misc/emi26.c
+++ b/drivers/usb/misc/emi26.c
@@ -39,18 +39,8 @@ static int emi26_writememory (struct usb_device *dev, int address,
 			      const unsigned char *data, int length,
 			      __u8 request)
 {
-	int result;
-	unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
-
-	if (!buffer) {
-		dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
-		return -ENOMEM;
-	}
-	/* Note: usb_control_msg returns negative value on error or length of the
-	 * 		 data that was written! */
-	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
-	kfree (buffer);
-	return result;
+	return usb_control_msg_send(dev, 0, request, 0x40, address, 0,
+				    data, length, 300, GFP_KERNEL);
 }
 
 /* thanks to drivers/usb/serial/keyspan_pda.c code */
-- 
2.25.1

[PATCH 06/15] usb: misc: emi62: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/emi62.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/misc/emi62.c b/drivers/usb/misc/emi62.c
index 3eea60437f56..de984e91085c 100644
--- a/drivers/usb/misc/emi62.c
+++ b/drivers/usb/misc/emi62.c
@@ -48,18 +48,8 @@ static int emi62_writememory(struct usb_device *dev, int address,
 			     const unsigned char *data, int length,
 			     __u8 request)
 {
-	int result;
-	unsigned char *buffer =  kmemdup(data, length, GFP_KERNEL);
-
-	if (!buffer) {
-		dev_err(&dev->dev, "kmalloc(%d) failed.\n", length);
-		return -ENOMEM;
-	}
-	/* Note: usb_control_msg returns negative value on error or length of the
-	 * 		 data that was written! */
-	result = usb_control_msg (dev, usb_sndctrlpipe(dev, 0), request, 0x40, address, 0, buffer, length, 300);
-	kfree (buffer);
-	return result;
+	return usb_control_msg_send(dev, 0, request, 0x40, address,
+				    0, data, length, 300, GFP_KERNEL);
 }
 
 /* thanks to drivers/usb/serial/keyspan_pda.c code */
-- 
2.25.1

[PATCH 07/15] usb: misc: ezusb: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/ezusb.c | 16 ++--------------
 1 file changed, 2 insertions(+), 14 deletions(-)

diff --git a/drivers/usb/misc/ezusb.c b/drivers/usb/misc/ezusb.c
index f058d8029761..78aaee56c2b7 100644
--- a/drivers/usb/misc/ezusb.c
+++ b/drivers/usb/misc/ezusb.c
@@ -31,24 +31,12 @@ static const struct ezusb_fx_type ezusb_fx1 = {
 static int ezusb_writememory(struct usb_device *dev, int address,
 				unsigned char *data, int length, __u8 request)
 {
-	int result;
-	unsigned char *transfer_buffer;
-
 	if (!dev)
 		return -ENODEV;
 
-	transfer_buffer = kmemdup(data, length, GFP_KERNEL);
-	if (!transfer_buffer) {
-		dev_err(&dev->dev, "%s - kmalloc(%d) failed.\n",
-							__func__, length);
-		return -ENOMEM;
-	}
-	result = usb_control_msg(dev, usb_sndctrlpipe(dev, 0), request,
+	return usb_control_msg_send(dev, 0, request,
 				 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
-				 address, 0, transfer_buffer, length, 3000);
-
-	kfree(transfer_buffer);
-	return result;
+				 address, 0, data, length, 3000, GFP_KERNEL);
 }
 
 static int ezusb_set_reset(struct usb_device *dev, unsigned short cpucs_reg,
-- 
2.25.1

[PATCH 08/15] usb: misc: idmouse: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/idmouse.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/misc/idmouse.c b/drivers/usb/misc/idmouse.c
index e9437a176518..52126441a633 100644
--- a/drivers/usb/misc/idmouse.c
+++ b/drivers/usb/misc/idmouse.c
@@ -56,8 +56,9 @@ static const struct usb_device_id idmouse_table[] = {
 #define FTIP_SCROLL  0x24
 
 #define ftip_command(dev, command, value, index) \
-	usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0), command, \
-	USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, value, index, NULL, 0, 1000)
+	usb_control_msg_send(dev->udev, 0, command, \
+	USB_TYPE_VENDOR | USB_RECIP_ENDPOINT | USB_DIR_OUT, \
+	value, index, NULL, 0, 1000, GFP_KERNEL)
 
 MODULE_DEVICE_TABLE(usb, idmouse_table);
 
-- 
2.25.1

[PATCH 09/15] usb: misc: iowarrior: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/iowarrior.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/usb/misc/iowarrior.c b/drivers/usb/misc/iowarrior.c
index 70ec29681526..53726fffe5df 100644
--- a/drivers/usb/misc/iowarrior.c
+++ b/drivers/usb/misc/iowarrior.c
@@ -109,12 +109,12 @@ static int usb_get_report(struct usb_device *dev,
 			  struct usb_host_interface *inter, unsigned char type,
 			  unsigned char id, void *buf, int size)
 {
-	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
-			       USB_REQ_GET_REPORT,
-			       USB_DIR_IN | USB_TYPE_CLASS |
-			       USB_RECIP_INTERFACE, (type << 8) + id,
-			       inter->desc.bInterfaceNumber, buf, size,
-			       GET_TIMEOUT*HZ);
+	return usb_control_msg_recv(dev, 0,
+				    USB_REQ_GET_REPORT,
+				    USB_DIR_IN | USB_TYPE_CLASS |
+				    USB_RECIP_INTERFACE, (type << 8) + id,
+				    inter->desc.bInterfaceNumber, buf, size,
+				    GET_TIMEOUT*HZ, GFP_KERNEL);
 }
 //#endif
 
@@ -123,13 +123,13 @@ static int usb_get_report(struct usb_device *dev,
 static int usb_set_report(struct usb_interface *intf, unsigned char type,
 			  unsigned char id, void *buf, int size)
 {
-	return usb_control_msg(interface_to_usbdev(intf),
-			       usb_sndctrlpipe(interface_to_usbdev(intf), 0),
-			       USB_REQ_SET_REPORT,
-			       USB_TYPE_CLASS | USB_RECIP_INTERFACE,
-			       (type << 8) + id,
-			       intf->cur_altsetting->desc.bInterfaceNumber, buf,
-			       size, HZ);
+	return usb_control_msg_send(interface_to_usbdev(intf),
+				    0,
+				    USB_REQ_SET_REPORT,
+				    USB_TYPE_CLASS | USB_RECIP_INTERFACE,
+				    (type << 8) + id,
+				    intf->cur_altsetting->desc.bInterfaceNumber, buf,
+				    size, HZ, GFP_KERNEL);
 }
 
 /*---------------------*/
@@ -854,10 +854,10 @@ static int iowarrior_probe(struct usb_interface *interface,
 
 	/* Set the idle timeout to 0, if this is interface 0 */
 	if (dev->interface->cur_altsetting->desc.bInterfaceNumber == 0) {
-	    usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-			    0x0A,
-			    USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
-			    0, NULL, 0, USB_CTRL_SET_TIMEOUT);
+		usb_control_msg_send(udev, 0,
+				     0x0A,
+				     USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
+				     0, NULL, 0, USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 	}
 	/* allow device read and ioctl */
 	dev->present = 1;
-- 
2.25.1

[PATCH 10/15] usb: misc: isight_firmware: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instances of usb_control_msg() have been replaced with
usb_control_msg_send(), and return value checking has also been
appropriately enforced.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/isight_firmware.c | 22 +++++++++++-----------
 1 file changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/usb/misc/isight_firmware.c b/drivers/usb/misc/isight_firmware.c
index 4d30095d6ad2..d3fa6fa81e6c 100644
--- a/drivers/usb/misc/isight_firmware.c
+++ b/drivers/usb/misc/isight_firmware.c
@@ -53,11 +53,11 @@ static int isight_firmware_load(struct usb_interface *intf,
 	ptr = firmware->data;
 
 	buf[0] = 0x01;
-	if (usb_control_msg
-	    (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
-	     300) != 1) {
+	ret = usb_control_msg_send(dev, 0, 0xa0, 0x40, 0xe600,
+				   0, buf, 1, 300, GFP_KERNEL);
+	if (ret != 0) {
 		printk(KERN_ERR
-		       "Failed to initialise isight firmware loader\n");
+			"Failed to initialise isight firmware loader\n");
 		ret = -ENODEV;
 		goto out;
 	}
@@ -86,11 +86,11 @@ static int isight_firmware_load(struct usb_interface *intf,
 
 			ptr += llen;
 
-			if (usb_control_msg
-			    (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, req, 0,
-			     buf, llen, 300) != llen) {
+			ret = usb_control_msg_send(dev, 0, 0xa0, 0x40, req, 0,
+						   buf, llen, 300, GFP_KERNEL);
+			if (ret != 0) {
 				printk(KERN_ERR
-				       "Failed to load isight firmware\n");
+					"Failed to load isight firmware\n");
 				ret = -ENODEV;
 				goto out;
 			}
@@ -99,9 +99,9 @@ static int isight_firmware_load(struct usb_interface *intf,
 	}
 
 	buf[0] = 0x00;
-	if (usb_control_msg
-	    (dev, usb_sndctrlpipe(dev, 0), 0xa0, 0x40, 0xe600, 0, buf, 1,
-	     300) != 1) {
+	ret = usb_control_msg_send(dev, 0, 0xa0, 0x40, 0xe600,
+				   0, buf, 1, 300, GFP_KERNEL);
+	if (ret != 0) {
 		printk(KERN_ERR "isight firmware loading completion failed\n");
 		ret = -ENODEV;
 	}
-- 
2.25.1

[PATCH 11/15] usb: misc: ldusb: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg_send() has been replaced
with usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/ldusb.c | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index 670e4d91e9ca..259ead4edecb 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -573,15 +573,13 @@ static ssize_t ld_usb_write(struct file *file, const char __user *buffer,
 	}
 
 	if (dev->interrupt_out_endpoint == NULL) {
-		/* try HID_REQ_SET_REPORT=9 on control_endpoint instead of interrupt_out_endpoint */
-		retval = usb_control_msg(interface_to_usbdev(dev->intf),
-					 usb_sndctrlpipe(interface_to_usbdev(dev->intf), 0),
-					 9,
+		retval = usb_control_msg_send(interface_to_usbdev(dev->intf),
+					 0, 9,
 					 USB_TYPE_CLASS | USB_RECIP_INTERFACE | USB_DIR_OUT,
 					 1 << 8, 0,
 					 dev->interrupt_out_buffer,
 					 bytes_to_write,
-					 USB_CTRL_SET_TIMEOUT);
+					 USB_CTRL_SET_TIMEOUT, GFP_KERNEL);
 		if (retval < 0)
 			dev_err(&dev->intf->dev,
 				"Couldn't submit HID_REQ_SET_REPORT %d\n",
-- 
2.25.1

[PATCH 12/15] usb: misc: lvstest: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() and the return value checking conditions have
also been modified appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/lvstest.c | 30 +++++++++++++++---------------
 1 file changed, 15 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/misc/lvstest.c b/drivers/usb/misc/lvstest.c
index f8686139d6f3..ab08483258d2 100644
--- a/drivers/usb/misc/lvstest.c
+++ b/drivers/usb/misc/lvstest.c
@@ -85,17 +85,17 @@ static void destroy_lvs_device(struct usb_device *udev)
 static int lvs_rh_clear_port_feature(struct usb_device *hdev,
 		int port1, int feature)
 {
-	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+	return usb_control_msg_send(hdev, 0,
 		USB_REQ_CLEAR_FEATURE, USB_RT_PORT, feature, port1,
-		NULL, 0, 1000);
+		NULL, 0, 1000, GFP_KERNEL);
 }
 
 static int lvs_rh_set_port_feature(struct usb_device *hdev,
 		int port1, int feature)
 {
-	return usb_control_msg(hdev, usb_sndctrlpipe(hdev, 0),
+	return usb_control_msg_send(hdev, 0,
 		USB_REQ_SET_FEATURE, USB_RT_PORT, feature, port1,
-		NULL, 0, 1000);
+		NULL, 0, 1000, GFP_KERNEL);
 }
 
 static ssize_t u3_entry_store(struct device *dev,
@@ -271,10 +271,10 @@ static ssize_t get_dev_desc_store(struct device *dev,
 		goto free_desc;
 	}
 
-	ret = usb_control_msg(udev, (PIPE_CONTROL << 30) | USB_DIR_IN,
-			USB_REQ_GET_DESCRIPTOR, USB_DIR_IN, USB_DT_DEVICE << 8,
-			0, descriptor, sizeof(*descriptor),
-			USB_CTRL_GET_TIMEOUT);
+	ret = usb_control_msg_recv(udev, 0, USB_REQ_GET_DESCRIPTOR,
+				   USB_DIR_IN, USB_DT_DEVICE << 8,
+				   0, descriptor, sizeof(*descriptor),
+				   USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
 	if (ret < 0)
 		dev_err(dev, "can't read device descriptor %d\n", ret);
 
@@ -336,10 +336,10 @@ static void lvs_rh_work(struct work_struct *work)
 
 	/* Examine each root port */
 	for (i = 1; i <= descriptor->bNbrPorts; i++) {
-		ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+		ret = usb_control_msg_recv(hdev, 0,
 			USB_REQ_GET_STATUS, USB_DIR_IN | USB_RT_PORT, 0, i,
-			port_status, sizeof(*port_status), 1000);
-		if (ret < 4)
+			port_status, sizeof(*port_status), 1000, GFP_KERNEL);
+		if (ret < 0)
 			continue;
 
 		portchange = le16_to_cpu(port_status->wPortChange);
@@ -420,13 +420,13 @@ static int lvs_rh_probe(struct usb_interface *intf,
 	usb_set_intfdata(intf, lvs);
 
 	/* how many number of ports this root hub has */
-	ret = usb_control_msg(hdev, usb_rcvctrlpipe(hdev, 0),
+	ret = usb_control_msg_recv(hdev, 0,
 			USB_REQ_GET_DESCRIPTOR, USB_DIR_IN | USB_RT_HUB,
 			USB_DT_SS_HUB << 8, 0, &lvs->descriptor,
-			USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT);
-	if (ret < (USB_DT_HUB_NONVAR_SIZE + 2)) {
+			USB_DT_SS_HUB_SIZE, USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
+	if (ret < 0) {
 		dev_err(&hdev->dev, "wrong root hub descriptor read %d\n", ret);
-		return ret < 0 ? ret : -EINVAL;
+		return ret;
 	}
 
 	/* submit urb to poll interrupt endpoint */
-- 
2.25.1

[PATCH 13/15] usb: misc: trancevibrator: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, the instance of usb_control_msg() has been replaced with
usb_control_msg_send() and the return value checking condition has also
been modified appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/trancevibrator.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/misc/trancevibrator.c b/drivers/usb/misc/trancevibrator.c
index a3dfc77578ea..2c36ee249b4b 100644
--- a/drivers/usb/misc/trancevibrator.c
+++ b/drivers/usb/misc/trancevibrator.c
@@ -59,12 +59,12 @@ static ssize_t speed_store(struct device *dev, struct device_attribute *attr,
 	dev_dbg(&tv->udev->dev, "speed = %d\n", tv->speed);
 
 	/* Set speed */
-	retval = usb_control_msg(tv->udev, usb_sndctrlpipe(tv->udev, 0),
+	retval = usb_control_msg_send(tv->udev, 0,
 				 0x01, /* vendor request: set speed */
 				 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
 				 tv->speed, /* speed value */
-				 0, NULL, 0, USB_CTRL_GET_TIMEOUT);
-	if (retval) {
+				 0, NULL, 0, USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
+	if (retval == 0) {
 		tv->speed = old;
 		dev_dbg(&tv->udev->dev, "retval = %d\n", retval);
 		return retval;
-- 
2.25.1

[PATCH 14/15] usb: misc: usbsevseg: update to use usb_control_msg_send()

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_send() appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/usbsevseg.c | 52 +++++++++++-------------------------
 1 file changed, 16 insertions(+), 36 deletions(-)

diff --git a/drivers/usb/misc/usbsevseg.c b/drivers/usb/misc/usbsevseg.c
index 551074f5b7ad..f0f6728a8b54 100644
--- a/drivers/usb/misc/usbsevseg.c
+++ b/drivers/usb/misc/usbsevseg.c
@@ -74,15 +74,10 @@ static void update_display_powered(struct usb_sevsegdev *mydev)
 	if (mydev->shadow_power != 1)
 		return;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
-			(80 * 0x100) + 10, /*  (power mode) */
-			(0x00 * 0x100) + (mydev->powered ? 1 : 0),
-			NULL,
-			0,
-			2000);
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
+				  (80 * 0x100) + 10, /*  (power mode) */
+				  (0x00 * 0x100) + (mydev->powered ? 1 : 0),
+				  NULL, 0, 2000, GFP_KERNEL);
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "power retval = %d\n", rc);
 
@@ -99,15 +94,10 @@ static void update_display_mode(struct usb_sevsegdev *mydev)
 	if(mydev->shadow_power != 1)
 		return;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
-			(82 * 0x100) + 10, /* (set mode) */
-			(mydev->mode_msb * 0x100) + mydev->mode_lsb,
-			NULL,
-			0,
-			2000);
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
+				  (82 * 0x100) + 10, /* (set mode) */
+				  (mydev->mode_msb * 0x100) + mydev->mode_lsb,
+				  NULL, 0, 2000, GFP_KERNEL);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "mode retval = %d\n", rc);
@@ -131,15 +121,10 @@ static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
 	for (i = 0; i < mydev->textlength; i++)
 		buffer[i] = mydev->text[mydev->textlength-1-i];
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
-			(85 * 0x100) + 10, /* (write text) */
-			(0 * 0x100) + mydev->textmode, /* mode  */
-			buffer,
-			mydev->textlength,
-			2000);
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
+				  (85 * 0x100) + 10, /* (write text) */
+				  (0 * 0x100) + mydev->textmode, /* mode  */
+				  buffer, mydev->textlength, 2000, GFP_KERNEL);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "write retval = %d\n", rc);
@@ -150,15 +135,10 @@ static void update_display_visual(struct usb_sevsegdev *mydev, gfp_t mf)
 	for (i = 0; i < sizeof(mydev->decimals); i++)
 		decimals |= mydev->decimals[i] << i;
 
-	rc = usb_control_msg(mydev->udev,
-			usb_sndctrlpipe(mydev->udev, 0),
-			0x12,
-			0x48,
-			(86 * 0x100) + 10, /* (set decimal) */
-			(0 * 0x100) + decimals, /* decimals */
-			NULL,
-			0,
-			2000);
+	rc = usb_control_msg_send(mydev->udev, 0, 0x12, 0x48,
+				  (86 * 0x100) + 10, /* (set decimal) */
+				  (0 * 0x100) + decimals, /* decimals */
+				  NULL, 0, 2000, GFP_KERNEL);
 
 	if (rc < 0)
 		dev_dbg(&mydev->udev->dev, "decimal retval = %d\n", rc);
-- 
2.25.1

[PATCH 15/15] usb: misc: usbtest: update to use the usb_control_msg_{send|recv}() API

[Anant Thazhemadam]

The newer usb_control_msg_{send|recv}() API are an improvement on the
existing usb_control_msg() as it ensures that a short read/write is treated
as an error, data can be used off the stack, and raw usb pipes need not be
created in the calling functions.
For this reason, instances of usb_control_msg() have been replaced with
usb_control_msg_{recv|send}() and the return value checking conditions have
also been modified appropriately.

Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
---
 drivers/usb/misc/usbtest.c | 63 +++++++++++++++++++-------------------
 1 file changed, 31 insertions(+), 32 deletions(-)

diff --git a/drivers/usb/misc/usbtest.c b/drivers/usb/misc/usbtest.c
index 150090ee4ec1..e44ec5261d82 100644
--- a/drivers/usb/misc/usbtest.c
+++ b/drivers/usb/misc/usbtest.c
@@ -672,10 +672,11 @@ static int get_altsetting(struct usbtest_dev *dev)
 	struct usb_device	*udev = interface_to_usbdev(iface);
 	int			retval;
 
-	retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-			USB_REQ_GET_INTERFACE, USB_DIR_IN|USB_RECIP_INTERFACE,
-			0, iface->altsetting[0].desc.bInterfaceNumber,
-			dev->buf, 1, USB_CTRL_GET_TIMEOUT);
+	retval = usb_control_msg_recv(udev, 0, USB_REQ_GET_INTERFACE,
+				      USB_DIR_IN|USB_RECIP_INTERFACE,
+				      0, iface->altsetting[0].desc.bInterfaceNumber,
+				      dev->buf, 1, USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
+
 	switch (retval) {
 	case 1:
 		return dev->buf[0];
@@ -685,6 +686,11 @@ static int get_altsetting(struct usbtest_dev *dev)
 	default:
 		return retval;
 	}
+
+	if (retval < 0)
+		return retval;
+
+	return dev->buf[0];
 }
 
 static int set_altsetting(struct usbtest_dev *dev, int alternate)
@@ -872,14 +878,15 @@ static int ch9_postconfig(struct usbtest_dev *dev)
 		 * ... although some cheap devices (like one TI Hub I've got)
 		 * won't return config descriptors except before set_config.
 		 */
-		retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				USB_REQ_GET_CONFIGURATION,
-				USB_DIR_IN | USB_RECIP_DEVICE,
-				0, 0, dev->buf, 1, USB_CTRL_GET_TIMEOUT);
-		if (retval != 1 || dev->buf[0] != expected) {
+		retval = usb_control_msg_recv(udev, 0, USB_REQ_GET_CONFIGURATION,
+					      USB_DIR_IN | USB_RECIP_DEVICE,  0,
+					      0, dev->buf, 1, USB_CTRL_GET_TIMEOUT,
+					      GFP_KERNEL);
+
+		if (retval != 0 || dev->buf[0] != expected) {
 			dev_err(&iface->dev, "get config --> %d %d (1 %d)\n",
 				retval, dev->buf[0], expected);
-			return (retval < 0) ? retval : -EDOM;
+			return retval;
 		}
 	}
 
@@ -1683,10 +1690,10 @@ static int test_halt(struct usbtest_dev *tdev, int ep, struct urb *urb)
 		return retval;
 
 	/* set halt (protocol test only), verify it worked */
-	retval = usb_control_msg(urb->dev, usb_sndctrlpipe(urb->dev, 0),
-			USB_REQ_SET_FEATURE, USB_RECIP_ENDPOINT,
-			USB_ENDPOINT_HALT, ep,
-			NULL, 0, USB_CTRL_SET_TIMEOUT);
+	retval = usb_control_msg_send(urb->dev, 0, USB_REQ_SET_FEATURE,
+				      USB_RECIP_ENDPOINT, USB_ENDPOINT_HALT,
+				      ep, NULL, 0, USB_CTRL_SET_TIMEOUT,
+				      GFP_KERNEL);
 	if (retval < 0) {
 		ERROR(tdev, "ep %02x couldn't set halt, %d\n", ep, retval);
 		return retval;
@@ -1845,30 +1852,22 @@ static int ctrl_out(struct usbtest_dev *dev,
 		/* write patterned data */
 		for (j = 0; j < len; j++)
 			buf[j] = (u8)(i + j);
-		retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
-				0x5b, USB_DIR_OUT|USB_TYPE_VENDOR,
-				0, 0, buf, len, USB_CTRL_SET_TIMEOUT);
-		if (retval != len) {
+		retval = usb_control_msg_send(udev, 0, 0x5b,
+					      USB_DIR_OUT | USB_TYPE_VENDOR, 0,
+					      0, buf, len, USB_CTRL_SET_TIMEOUT,
+					      GFP_KERNEL);
+		if (retval < 0) {
 			what = "write";
-			if (retval >= 0) {
-				ERROR(dev, "ctrl_out, wlen %d (expected %d)\n",
-						retval, len);
-				retval = -EBADMSG;
-			}
 			break;
 		}
 
 		/* read it back -- assuming nothing intervened!!  */
-		retval = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
-				0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
-				0, 0, buf, len, USB_CTRL_GET_TIMEOUT);
-		if (retval != len) {
+		retval = usb_control_msg_recv(udev, 0,
+					      0x5c, USB_DIR_IN|USB_TYPE_VENDOR,
+					      0, 0, buf, len, USB_CTRL_GET_TIMEOUT,
+					      GFP_KERNEL);
+		if (retval < 0) {
 			what = "read";
-			if (retval >= 0) {
-				ERROR(dev, "ctrl_out, rlen %d (expected %d)\n",
-						retval, len);
-				retval = -EBADMSG;
-			}
 			break;
 		}
 
-- 
2.25.1

Re: [PATCH 03/15] usb: misc: cytherm: update to use usb_control_msg_recv()

[Greg Kroah-Hartman]

On Sun, Nov 29, 2020 at 09:36:00PM +0530, Anant Thazhemadam wrote:
> The newer usb_control_msg_{send|recv}() API are an improvement on the
> existing usb_control_msg() as it ensures that a short read/write is treated
> as an error, data can be used off the stack, and raw usb pipes need not be
> created in the calling functions.
> For this reason, the instance of usb_control_msg() has been replaced with
> usb_control_msg_recv().
> 
> The return value checking enforced by callers of the updated function have
> also been appropriately updated.
> 
> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>
> ---
>  drivers/usb/misc/cytherm.c | 42 +++++++++++++++++++-------------------
>  1 file changed, 21 insertions(+), 21 deletions(-)
> 
> diff --git a/drivers/usb/misc/cytherm.c b/drivers/usb/misc/cytherm.c
> index 3e3802aaefa3..75fa4d806a77 100644
> --- a/drivers/usb/misc/cytherm.c
> +++ b/drivers/usb/misc/cytherm.c
> @@ -51,12 +51,12 @@ static int vendor_command(struct usb_device *dev, unsigned char request,
>  			  unsigned char value, unsigned char index,
>  			  void *buf, int size)
>  {
> -	return usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
> -			       request, 
> -			       USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
> -			       value, 
> -			       index, buf, size,
> -			       USB_CTRL_GET_TIMEOUT);
> +	return usb_control_msg_recv(dev, 0,
> +				    request,
> +				    USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_OTHER,
> +				    value,
> +				    index, buf, size,
> +				    USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
>  }
>  
>  
> @@ -95,14 +95,14 @@ static ssize_t brightness_store(struct device *dev, struct device_attribute *att
>  	/* Set brightness */
>  	retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS, 
>  				cytherm->brightness, buffer, 8);
> -	if (retval)
> -		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
> +	if (!retval)
> +		dev_dbg(&cytherm->udev->dev, "brightness set correctly\n");
>  	/* Inform µC that we have changed the brightness setting */
>  	retval = vendor_command(cytherm->udev, WRITE_RAM, BRIGHTNESS_SEM,
>  				0x01, buffer, 8);
> -	if (retval)
> -		dev_dbg(&cytherm->udev->dev, "retval = %d\n", retval);
> -   
> +	if (!retval)
> +		dev_dbg(&cytherm->udev->dev, "µC informed of change in brightness setting\n");
> +
>  	kfree(buffer);
>     
>  	return count;

There's no more need to dynamically allocate the buffer variable here
now, right?  It can be on the stack as the change you made above allows
that to work properly, no need to allocate the buffer twice in a row
(once here and once in the USB core).

That would make these functions less complex, always a good thing.

You should check this on the other patches in this series as well.

thanks,

greg k-h

Re: [PATCH 03/15] usb: misc: cytherm: update to use usb_control_msg_recv()

[Anant Thazhemadam]

On 29/11/20 9:46 pm, Greg Kroah-Hartman wrote:
> There's no more need to dynamically allocate the buffer variable here
> now, right?  It can be on the stack as the change you made above allows
> that to work properly, no need to allocate the buffer twice in a row
> (once here and once in the USB core).
>
> That would make these functions less complex, always a good thing.
>
> You should check this on the other patches in this series as well.

Understood, I will do that. I apologize for the oversight.

Thanks,
Anant

RE: [PATCH 04/15] usb: misc: ehset: update to use the usb_control_msg_{send|recv}() API

[Peter Chen]

 
> 
> The newer usb_control_msg_{send|recv}() API are an improvement on the
> existing usb_control_msg() as it ensures that a short read/write is treated as
> an error, data can be used off the stack, and raw usb pipes need not be created
> in the calling functions.
> For this reason, instances of usb_control_msg() have been replaced with
> usb_control_msg_{recv|send}() appropriately.
> 
> Signed-off-by: Anant Thazhemadam <anant.thazhemadam@gmail.com>

Reviewed-by: Peter Chen <peter.chen@nxp.com>

Peter

> ---
>  drivers/usb/misc/ehset.c | 70 ++++++++++++++++++----------------------
>  1 file changed, 31 insertions(+), 39 deletions(-)
> 
> diff --git a/drivers/usb/misc/ehset.c b/drivers/usb/misc/ehset.c index
> 2752e1f4f4d0..068f4fae2965 100644
> --- a/drivers/usb/misc/ehset.c
> +++ b/drivers/usb/misc/ehset.c
> @@ -30,48 +30,42 @@ static int ehset_probe(struct usb_interface *intf,
> 
>  	switch (test_pid) {
>  	case TEST_SE0_NAK_PID:
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_TEST,
> -					(USB_TEST_SE0_NAK << 8) | portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_TEST,
> +					   (USB_TEST_SE0_NAK << 8) | portnum,
> +					   NULL, 0, 1000, GFP_KERNEL);
>  		break;
>  	case TEST_J_PID:
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_TEST,
> -					(USB_TEST_J << 8) | portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_TEST,
> +					   (USB_TEST_J << 8) | portnum, NULL, 0,
> +					   1000, GFP_KERNEL);
>  		break;
>  	case TEST_K_PID:
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_TEST,
> -					(USB_TEST_K << 8) | portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_TEST,
> +					   (USB_TEST_K << 8) | portnum, NULL, 0,
> +					   1000, GFP_KERNEL);
>  		break;
>  	case TEST_PACKET_PID:
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_TEST,
> -					(USB_TEST_PACKET << 8) | portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_TEST,
> +					   (USB_TEST_PACKET << 8) | portnum,
> +					   NULL, 0, 1000, GFP_KERNEL);
>  		break;
>  	case TEST_HS_HOST_PORT_SUSPEND_RESUME:
>  		/* Test: wait for 15secs -> suspend -> 15secs delay -> resume */
>  		msleep(15 * 1000);
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_SUSPEND, portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
> +					   portnum, NULL, 0, 1000, GFP_KERNEL);
>  		if (ret < 0)
>  			break;
> 
>  		msleep(15 * 1000);
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_CLEAR_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_SUSPEND, portnum,
> -					NULL, 0, 1000);
> +		ret = usb_control_msg_send(hub_udev, 0,
> USB_REQ_CLEAR_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_SUSPEND,
> +					   portnum, NULL, 0, 1000, GFP_KERNEL);
>  		break;
>  	case TEST_SINGLE_STEP_GET_DEV_DESC:
>  		/* Test: wait for 15secs -> GetDescriptor request */ @@ -80,11
> +74,10 @@ static int ehset_probe(struct usb_interface *intf,
>  		if (!buf)
>  			return -ENOMEM;
> 
> -		ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0),
> -					USB_REQ_GET_DESCRIPTOR, USB_DIR_IN,
> -					USB_DT_DEVICE << 8, 0,
> -					buf, USB_DT_DEVICE_SIZE,
> -					USB_CTRL_GET_TIMEOUT);
> +		ret = usb_control_msg_recv(dev, 0, USB_REQ_GET_DESCRIPTOR,
> +					   USB_DIR_IN, USB_DT_DEVICE << 8, 0,
> +					   buf, USB_DT_DEVICE_SIZE,
> +					   USB_CTRL_GET_TIMEOUT, GFP_KERNEL);
>  		kfree(buf);
>  		break;
>  	case TEST_SINGLE_STEP_SET_FEATURE:
> @@ -100,11 +93,10 @@ static int ehset_probe(struct usb_interface *intf,
>  			break;
>  		}
> 
> -		ret = usb_control_msg(hub_udev, usb_sndctrlpipe(hub_udev, 0),
> -					USB_REQ_SET_FEATURE, USB_RT_PORT,
> -					USB_PORT_FEAT_TEST,
> -					(6 << 8) | portnum,
> -					NULL, 0, 60 * 1000);
> +		ret = usb_control_msg_send(hub_udev, 0, USB_REQ_SET_FEATURE,
> +					   USB_RT_PORT, USB_PORT_FEAT_TEST,
> +					   (6 << 8) | portnum, NULL, 0,
> +					   60 * 1000, GFP_KERNEL);
> 
>  		break;
>  	default:
> @@ -112,7 +104,7 @@ static int ehset_probe(struct usb_interface *intf,
>  			__func__, test_pid);
>  	}
> 
> -	return (ret < 0) ? ret : 0;
> +	return ret;
>  }
> 
>  static void ehset_disconnect(struct usb_interface *intf)
> --
> 2.25.1