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cdc-acm: close race betrween suspend() and acm_softint

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Suspend increments a counter, then kills the URBs,
then kills the scheduled work. The scheduled work, however,
may reschedule the URBs. Fix this by having the work
check the counter.

Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Tested-by: Jonas Karlsson <jonas.karlsson@actia.se>
Link: https://lore.kernel.org/r/20200415151358.32664-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2020-04-15 17:13:57 +02:00 committed by Greg Kroah-Hartman
parent f6cc6093a7
commit 0afccd7601
1 changed files with 3 additions and 3 deletions
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6
drivers/usb/class/cdc-acm.c
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@ -557,15 +557,15 @@ static void acm_softint(struct work_struct *work)
struct acm *acm = container_of(work, struct acm, work);
if (test_bit(EVENT_RX_STALL, &acm->flags)) {
if (!(usb_autopm_get_interface(acm->data))) {
smp_mb(); /* against acm_suspend() */
if (!acm->susp_count) {
for (i = 0; i < acm->rx_buflimit; i++)
usb_kill_urb(acm->read_urbs[i]);
usb_clear_halt(acm->dev, acm->in);
acm_submit_read_urbs(acm, GFP_KERNEL);
usb_autopm_put_interface(acm->data);
}
clear_bit(EVENT_RX_STALL, &acm->flags);
}
}
if (test_and_clear_bit(EVENT_TTY_WAKEUP, &acm->flags))
tty_port_tty_wakeup(&acm->port);