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Subject[PATCH 4.15 35/55] USB: serial: io_edgeport: fix possible sleep-in-atomic
Date
4.15-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jia-Ju Bai <baijiaju1990@gmail.com>

commit c7b8f77872c73f69a16528a9eb87afefcccdc18b upstream.

According to drivers/usb/serial/io_edgeport.c, the driver may sleep
under a spinlock.
The function call path is:
edge_bulk_in_callback (acquire the spinlock)
process_rcvd_data
process_rcvd_status
change_port_settings
send_iosp_ext_cmd
write_cmd_usb
usb_kill_urb --> may sleep

To fix it, the redundant usb_kill_urb() is removed from the error path
after usb_submit_urb() fails.

This possible bug is found by my static analysis tool (DSAC) and checked
by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/serial/io_edgeport.c | 1 -
1 file changed, 1 deletion(-)

--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -2282,7 +2282,6 @@ static int write_cmd_usb(struct edgeport
/* something went wrong */
dev_err(dev, "%s - usb_submit_urb(write command) failed, status = %d\n",
__func__, status);
- usb_kill_urb(urb);
usb_free_urb(urb);
atomic_dec(&CmdUrbs);
return status;

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