diff options
| author |   Tobias Herzog <t-herzog@gmx.de> | 2018-09-22 22:11:10 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-10-09 16:13:42 +0200 |
| commit | dae3ddba36f8c337fb59cef07d564da6fc9b7551 (patch) | |
| tree | 817ca4e62e0e4e9976c96a24dc18d0cbc40917a7 /drivers/usb/class | |
| parent | cdc-acm: fix race between reset and control messaging (diff) | |
| download | linux-dev-dae3ddba36f8c337fb59cef07d564da6fc9b7551.tar.xz linux-dev-dae3ddba36f8c337fb59cef07d564da6fc9b7551.zip | |
cdc-acm: do not reset notification buffer index upon urb unlinking
Resetting the write index of the notification buffer on urb unlink (e.g.
closing a cdc-acm device from userspace) may lead to wrong interpretation
of further received notifications, in case the index is not 0 when urb
unlink happens (i.e. when parts of a notification already have been
transferred). On the device side there is no "reset" of the notification
transimission and thus we would get out of sync with the device.
Signed-off-by: Tobias Herzog <t-herzog@gmx.de>
Acked-by: Oliver Neukum <oneukum@suse.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 1833912f7f5f..e43ea9641416 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -355,7 +355,6 @@ static void acm_ctrl_irq(struct urb *urb) case -ENOENT: case -ESHUTDOWN: /* this urb is terminated, clean up */ - acm->nb_index = 0; dev_dbg(&acm->control->dev, "%s - urb shutting down with status: %d\n", __func__, status); |