This is a note to let you know that I've just added the patch titled
USB: serial: io_edgeport: fix possible sleep-in-atomic
to my usb git tree which can be found at
git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-testing branch.
The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)
The patch will be merged to the usb-next branch sometime soon,
after it passes testing, and the merge window is open.
If you have any questions about this process, please let me know.
>From c7b8f77872c73f69a16528a9eb87afefcccdc18b Mon Sep 17 00:00:00 2001
From: Jia-Ju Bai <baijiaju1990@xxxxxxxxx>
Date: Wed, 13 Dec 2017 20:34:36 +0800
Subject: 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@xxxxxxxxx>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Johan Hovold <johan@xxxxxxxxxx>
---
drivers/usb/serial/io_edgeport.c | 1 -
1 file changed, 1 deletion(-)
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;
--
2.15.1