Commit 830f4021 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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USB: fix disconnect bug in cdc-acm 



cdc-acm must give up secondary interfaces if the primary is disconnected
and vice versa. This wasn't done correctly.

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 62ad296b

drivers/usb/class/cdc-acm.c

+15 −13
Original line number Diff line number Diff line
@@ -838,7 +838,7 @@ static void acm_tty_set_termios(struct tty_struct *tty, struct ktermios *termios 
 * USB probe and disconnect routines.

 */



/* Little helper: write buffers free */

/* Little helpers: write/read buffers free */

static void acm_write_buffers_free(struct acm *acm)

{

	int i;
@@ -849,6 +849,15 @@ static void acm_write_buffers_free(struct acm *acm) 
	}

}



static void acm_read_buffers_free(struct acm *acm)

{

	struct usb_device *usb_dev = interface_to_usbdev(acm->control);

	int i, n = acm->rx_buflimit;



	for (i = 0; i < n; i++)

		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);

}



/* Little helper: write buffers allocate */

static int acm_write_buffers_alloc(struct acm *acm)

{
@@ -1171,8 +1180,7 @@ alloc_fail8: 
	for (i = 0; i < ACM_NW; i++)

		usb_free_urb(acm->wb[i].urb);

alloc_fail7:

	for (i = 0; i < num_rx_buf; i++)

		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);

	acm_read_buffers_free(acm);

	for (i = 0; i < num_rx_buf; i++)

		usb_free_urb(acm->ru[i].urb);

	usb_free_urb(acm->ctrlurb);
@@ -1209,15 +1217,9 @@ static void acm_disconnect(struct usb_interface *intf) 
{

	struct acm *acm = usb_get_intfdata(intf);

	struct usb_device *usb_dev = interface_to_usbdev(intf);

	int i;



	if (!acm || !acm->dev) {

		dbg("disconnect on nonexisting interface");

		return;

	}



	mutex_lock(&open_mutex);

	if (!usb_get_intfdata(intf)) {

	if (!acm || !acm->dev) {

		mutex_unlock(&open_mutex);

		return;

	}
@@ -1236,10 +1238,10 @@ static void acm_disconnect(struct usb_interface *intf) 


	acm_write_buffers_free(acm);

	usb_buffer_free(usb_dev, acm->ctrlsize, acm->ctrl_buffer, acm->ctrl_dma);

	for (i = 0; i < acm->rx_buflimit; i++)

		usb_buffer_free(usb_dev, acm->readsize, acm->rb[i].base, acm->rb[i].dma);

	acm_read_buffers_free(acm);



	usb_driver_release_interface(&acm_driver, intf == acm->control ? acm->data : intf);

	usb_driver_release_interface(&acm_driver, intf == acm->control ?

					acm->data : acm->control);



	if (!acm->used) {

		acm_tty_unregister(acm);