From: "Zhang, Qiang" <Qiang.Zhang@windriver.com>
To: "balbi@kernel.org" <balbi@kernel.org>,
"felipe.balbi@linux.intel.com" <felipe.balbi@linux.intel.com>
Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"linux-usb@vger.kernel.org" <linux-usb@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: 回复: [PATCH] usb: gadget: function: printer: Add gadget dev interface status judgment
Date: Sun, 28 Jun 2020 01:14:42 +0000 [thread overview]
Message-ID: <BYAPR11MB2632EA8B20AE37583B252FD6FF910@BYAPR11MB2632.namprd11.prod.outlook.com> (raw)
In-Reply-To: <20200615094608.26179-1-qiang.zhang@windriver.com>
________________________________________
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15日 17:46
收件人: balbi@kernel.org
抄送: gregkh@linuxfoundation.org; linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org
主题: [PATCH] usb: gadget: function: printer: Add gadget dev interface status judgment
From: Zqiang <qiang.zhang@windriver.com>
After the interface of gadget printer device was disabled,
We should not continue operate the device.
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
prev parent reply other threads:[~2020-06-28 1:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-15 9:46 [PATCH] usb: gadget: function: printer: Add gadget dev interface status judgment qiang.zhang
2020-06-24 8:59 ` 回复: " Zhang, Qiang
2020-06-24 9:29 ` Greg KH
2020-07-25 6:15 ` Felipe Balbi
2020-06-28 1:14 ` Zhang, Qiang [this message]
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