diff options
| author | Oliver Neukum <oneukum@suse.com> | 2021-04-21 10:45:13 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-28 14:41:51 +0300 |
| commit | 469633d344ba25e37b317dcf687f306ebe0c2bd4 (patch) | |
| tree | 0b693aa8b19fa5efa3b87fa26d904ae7d17a2d04 | |
| parent | 0f000005da31f6947f843ce6b3e3a960540c6e00 (diff) | |
| download | linux-469633d344ba25e37b317dcf687f306ebe0c2bd4.tar.xz | |
USB: CDC-ACM: fix poison/unpoison imbalance
commit a8b3b519618f30a87a304c4e120267ce6f8dc68a upstream.
suspend() does its poisoning conditionally, resume() does it
unconditionally. On a device with combined interfaces this
will balance, on a device with two interfaces the counter will
go negative and resubmission will fail.
Both actions need to be done conditionally.
Fixes: 6069e3e927c8f ("USB: cdc-acm: untangle a circular dependency between callback and softint")
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210421074513.4327-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index e79359326411..bc035ba6e010 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1637,12 +1637,13 @@ static int acm_resume(struct usb_interface *intf) struct urb *urb; int rv = 0; - acm_unpoison_urbs(acm); spin_lock_irq(&acm->write_lock); if (--acm->susp_count) goto out; + acm_unpoison_urbs(acm); + if (tty_port_initialized(&acm->port)) { rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC); |