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| author |   Jia-Ju Bai <baijiaju1990@gmail.com> | 2017-12-13 20:34:36 +0800 |
|---|---|---|
| committer |   Johan Hovold <johan@kernel.org> | 2017-12-14 10:32:29 +0100 |
| commit | c7b8f77872c73f69a16528a9eb87afefcccdc18b (patch) | |
| tree | 47b57fee74339dea998441d99908b57aa17b25df /drivers/usb/serial | |
| parent | USB: serial: ark3116: clean up return values of register accessors (diff) | |
| download | linux-dev-c7b8f77872c73f69a16528a9eb87afefcccdc18b.tar.xz linux-dev-c7b8f77872c73f69a16528a9eb87afefcccdc18b.zip | |
USB: serial: io_edgeport: fix possible sleep-in-atomic
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")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Diffstat (limited to 'drivers/usb/serial')
| -rw-r--r-- | drivers/usb/serial/io_edgeport.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/usb/serial/io_edgeport.c b/drivers/usb/serial/io_edgeport.c index 219265ce3711..17283f4b4779 100644 --- 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_port *edge_port, /* 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; |