* [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
@ 2020-06-30 5:23 qiang.zhang
2020-07-06 5:20 ` 回复: " Zhang, Qiang
0 siblings, 1 reply; 4+ messages in thread
From: qiang.zhang @ 2020-06-30 5:23 UTC (permalink / raw)
To: balbi; +Cc: gregkh, linux-usb
From: Zqiang <qiang.zhang@windriver.com>
After the device is disconnected from the host side, the interface of
the device is reset. If the userspace operates the device again,
an error code should be returned.
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
---
drivers/usb/gadget/function/f_printer.c | 36 +++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index 9c7ed2539ff7..2b45a61e4213 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -338,6 +338,11 @@ printer_open(struct inode *inode, struct file *fd)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
if (!dev->printer_cdev_open) {
dev->printer_cdev_open = 1;
fd->private_data = dev;
@@ -430,6 +435,12 @@ printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* We will use this flag later to check if a printer reset happened
* after we turn interrupts back on.
*/
@@ -561,6 +572,12 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* Check if a printer reset happens while we have interrupts on */
dev->reset_printer = 0;
@@ -667,6 +684,13 @@ printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
inode_lock(inode);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ inode_unlock(inode);
+ return -ENODEV;
+ }
+
tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
spin_unlock_irqrestore(&dev->lock, flags);
@@ -689,6 +713,13 @@ printer_poll(struct file *fd, poll_table *wait)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return EPOLLERR | EPOLLHUP;
+ }
+
setup_rx_reqs(dev);
spin_unlock_irqrestore(&dev->lock, flags);
mutex_unlock(&dev->lock_printer_io);
@@ -722,6 +753,11 @@ printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
switch (code) {
case GADGET_GET_PRINTER_STATUS:
status = (int)dev->printer_status;
--
2.24.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* 回复: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
2020-06-30 5:23 [PATCH] usb: gadget: function: printer: Interface is disabled and returns error qiang.zhang
@ 2020-07-06 5:20 ` Zhang, Qiang
2020-07-08 2:22 ` Zhang, Qiang
0 siblings, 1 reply; 4+ messages in thread
From: Zhang, Qiang @ 2020-07-06 5:20 UTC (permalink / raw)
To: balbi; +Cc: gregkh, linux-usb, andrzejtp2010
________________________________________
发件人: linux-usb-owner@vger.kernel.org <linux-usb-owner@vger.kernel.org> 代表 qiang.zhang@windriver.com <qiang.zhang@windriver.com>
发送时间: 2020年6月30日 13:23
收件人: balbi@kernel.org
抄送: gregkh@linuxfoundation.org; linux-usb@vger.kernel.org
主题: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
From: Zqiang <qiang.zhang@windriver.com>
After the device is disconnected from the host side, the interface of
the device is reset. If the userspace operates the device again,
an error code should be returned.
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
---
drivers/usb/gadget/function/f_printer.c | 36 +++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index 9c7ed2539ff7..2b45a61e4213 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -338,6 +338,11 @@ printer_open(struct inode *inode, struct file *fd)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
if (!dev->printer_cdev_open) {
dev->printer_cdev_open = 1;
fd->private_data = dev;
@@ -430,6 +435,12 @@ printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* We will use this flag later to check if a printer reset happened
* after we turn interrupts back on.
*/
@@ -561,6 +572,12 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* Check if a printer reset happens while we have interrupts on */
dev->reset_printer = 0;
@@ -667,6 +684,13 @@ printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
inode_lock(inode);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ inode_unlock(inode);
+ return -ENODEV;
+ }
+
tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
spin_unlock_irqrestore(&dev->lock, flags);
@@ -689,6 +713,13 @@ printer_poll(struct file *fd, poll_table *wait)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return EPOLLERR | EPOLLHUP;
+ }
+
setup_rx_reqs(dev);
spin_unlock_irqrestore(&dev->lock, flags);
mutex_unlock(&dev->lock_printer_io);
@@ -722,6 +753,11 @@ printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
switch (code) {
case GADGET_GET_PRINTER_STATUS:
status = (int)dev->printer_status;
--
2.24.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* 回复: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
2020-07-06 5:20 ` 回复: " Zhang, Qiang
@ 2020-07-08 2:22 ` Zhang, Qiang
2020-07-08 7:11 ` gregkh
0 siblings, 1 reply; 4+ messages in thread
From: Zhang, Qiang @ 2020-07-08 2:22 UTC (permalink / raw)
To: Felipe Balbi
Cc: gregkh, linux-usb, balbi, andrzej.p, Felipe Balbi, andrzejtp2010
Hi Felipe
Please review this change.
thanks
Zhang Qiang
________________________________________
发件人: linux-usb-owner@vger.kernel.org <linux-usb-owner@vger.kernel.org> 代表 Zhang, Qiang <Qiang.Zhang@windriver.com>
发送时间: 2020年7月6日 13:20
收件人: balbi@kernel.org
抄送: gregkh@linuxfoundation.org; linux-usb@vger.kernel.org; andrzejtp2010@gmail.com
主题: 回复: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
________________________________________
发件人: linux-usb-owner@vger.kernel.org <linux-usb-owner@vger.kernel.org> 代表 qiang.zhang@windriver.com <qiang.zhang@windriver.com>
发送时间: 2020年6月30日 13:23
收件人: balbi@kernel.org
抄送: gregkh@linuxfoundation.org; linux-usb@vger.kernel.org
主题: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
From: Zqiang <qiang.zhang@windriver.com>
After the device is disconnected from the host side, the interface of
the device is reset. If the userspace operates the device again,
an error code should be returned.
Signed-off-by: Zqiang <qiang.zhang@windriver.com>
---
drivers/usb/gadget/function/f_printer.c | 36 +++++++++++++++++++++++++
1 file changed, 36 insertions(+)
diff --git a/drivers/usb/gadget/function/f_printer.c b/drivers/usb/gadget/function/f_printer.c
index 9c7ed2539ff7..2b45a61e4213 100644
--- a/drivers/usb/gadget/function/f_printer.c
+++ b/drivers/usb/gadget/function/f_printer.c
@@ -338,6 +338,11 @@ printer_open(struct inode *inode, struct file *fd)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
if (!dev->printer_cdev_open) {
dev->printer_cdev_open = 1;
fd->private_data = dev;
@@ -430,6 +435,12 @@ printer_read(struct file *fd, char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* We will use this flag later to check if a printer reset happened
* after we turn interrupts back on.
*/
@@ -561,6 +572,12 @@ printer_write(struct file *fd, const char __user *buf, size_t len, loff_t *ptr)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return -ENODEV;
+ }
+
/* Check if a printer reset happens while we have interrupts on */
dev->reset_printer = 0;
@@ -667,6 +684,13 @@ printer_fsync(struct file *fd, loff_t start, loff_t end, int datasync)
inode_lock(inode);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ inode_unlock(inode);
+ return -ENODEV;
+ }
+
tx_list_empty = (likely(list_empty(&dev->tx_reqs)));
spin_unlock_irqrestore(&dev->lock, flags);
@@ -689,6 +713,13 @@ printer_poll(struct file *fd, poll_table *wait)
mutex_lock(&dev->lock_printer_io);
spin_lock_irqsave(&dev->lock, flags);
+
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ mutex_unlock(&dev->lock_printer_io);
+ return EPOLLERR | EPOLLHUP;
+ }
+
setup_rx_reqs(dev);
spin_unlock_irqrestore(&dev->lock, flags);
mutex_unlock(&dev->lock_printer_io);
@@ -722,6 +753,11 @@ printer_ioctl(struct file *fd, unsigned int code, unsigned long arg)
spin_lock_irqsave(&dev->lock, flags);
+ if (dev->interface < 0) {
+ spin_unlock_irqrestore(&dev->lock, flags);
+ return -ENODEV;
+ }
+
switch (code) {
case GADGET_GET_PRINTER_STATUS:
status = (int)dev->printer_status;
--
2.24.1
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: 回复: [PATCH] usb: gadget: function: printer: Interface is disabled and returns error
2020-07-08 2:22 ` Zhang, Qiang
@ 2020-07-08 7:11 ` gregkh
0 siblings, 0 replies; 4+ messages in thread
From: gregkh @ 2020-07-08 7:11 UTC (permalink / raw)
To: Zhang, Qiang; +Cc: Felipe Balbi, linux-usb, balbi, andrzej.p, andrzejtp2010
On Wed, Jul 08, 2020 at 02:22:58AM +0000, Zhang, Qiang wrote:
>
> Hi Felipe
> Please review this change.
Please give maintainers a chance, you sent this 1 day ago.
Also, do not top-post.
greg k-h
^ permalink raw reply [flat|nested] 4+ messages in thread
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2020-06-30 5:23 [PATCH] usb: gadget: function: printer: Interface is disabled and returns error qiang.zhang
2020-07-06 5:20 ` 回复: " Zhang, Qiang
2020-07-08 2:22 ` Zhang, Qiang
2020-07-08 7:11 ` gregkh
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