mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-05 18:39:59 +00:00
Code Issues Releases Wiki Activity

USB: usb_wwan: fix race between write and resume

Browse source 
We find a race between write and resume. usb_wwan_resume run play_delayed()
and spin_unlock, but intfdata->suspended still is not set to zero.
At this time usb_wwan_write is called and anchor the urb to delay
list. Then resume keep running but the delayed urb have no chance
to be commit until next resume. If the time of next resume is far
away, tty will be blocked in tty_wait_until_sent during time. The
race also can lead to writes being reordered.

This patch put play_Delayed and intfdata->suspended together in the
spinlock, it's to avoid the write race during resume.

Fixes: 383cedc3bb ("USB: serial: full autosuspend support for the
option driver")

Signed-off-by: xiao jin <jin.xiao@intel.com>
Signed-off-by: Zhang, Qi1 <qi1.zhang@intel.com>
Reviewed-by: David Cohen <david.a.cohen@linux.intel.com>
Cc: <stable@vger.kernel.org>	# v2.6.32
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
xiao jin 2014-05-26 19:23:14 +02:00 committed by Greg Kroah-Hartman
parent db09047379
commit d9e93c08d8
1 changed files with 2 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

8
drivers/usb/serial/usb_wwan.c
View file

@ -660,17 +660,15 @@ int usb_wwan_resume(struct usb_serial *serial)
}
}
spin_lock_irq(&intfdata->susp_lock);
for (i = 0; i < serial->num_ports; i++) {
/* walk all ports */
port = serial->port[i];
portdata = usb_get_serial_port_data(port);
/* skip closed ports */
spin_lock_irq(&intfdata->susp_lock);
if (!portdata || !portdata->opened) {
spin_unlock_irq(&intfdata->susp_lock);
if (!portdata || !portdata->opened)
continue;
}
for (j = 0; j < N_IN_URB; j++) {
urb = portdata->in_urbs[j];
@ -683,9 +681,7 @@ int usb_wwan_resume(struct usb_serial *serial)
}
}
play_delayed(port);
spin_unlock_irq(&intfdata->susp_lock);
}
spin_lock_irq(&intfdata->susp_lock);
intfdata->suspended = 0;
spin_unlock_irq(&intfdata->susp_lock);
err_out: