diff options
| author | Johan Hovold <jhovold@gmail.com> | 2013-03-19 09:21:06 +0100 |
|---|---|---|
| committer | Luis Henriques <luis.henriques@canonical.com> | 2013-03-25 19:18:24 +0000 |
| commit | c7f752e5409d943ae30b46bdf0b583b0d251739a (patch) | |
| tree | dea19fed52f7a48c97783c3b9ebe2f648448dfe1 | |
| parent | f0c405c0a88dddc8d949c2f6eb38dae27665e287 (diff) | |
USB: cdc-acm: fix device unregistration
commit cb25505fc604292c70fc02143fc102f54c8595f0 upstream.
Unregister tty device in disconnect as is required by the USB stack.
By deferring unregistration to when the last tty reference is dropped,
the parent interface device can get unregistered before the child
resulting in broken hotplug events being generated when the tty is
finally closed:
KERNEL[2290.798128] remove /devices/pci0000:00/0000:00:1d.7/usb2/2-1/2-1:3.1 (usb)
KERNEL[2290.804589] remove /devices/pci0000:00/0000:00:1d.7/usb2/2-1 (usb)
KERNEL[2294.554799] remove /2-1:3.1/tty/ttyACM0 (tty)
The driver must deal with tty callbacks after disconnect by checking the
disconnected flag. Specifically, further opens must be prevented and
this is already implemented.
Cc: Oliver Neukum <oneukum@suse.de>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
| -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 ec2bba6e012b..07a9f9c12b86 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -601,7 +601,6 @@ static void acm_port_destruct(struct tty_port *port) dev_dbg(&acm->control->dev, "%s\n", __func__); - tty_unregister_device(acm_tty_driver, acm->minor); acm_release_minor(acm); usb_put_intf(acm->control); kfree(acm->country_codes); @@ -1418,6 +1417,8 @@ static void acm_disconnect(struct usb_interface *intf) stop_data_traffic(acm); + tty_unregister_device(acm_tty_driver, acm->minor); + usb_free_urb(acm->ctrlurb); for (i = 0; i < ACM_NW; i++) usb_free_urb(acm->wb[i].urb); |