diff options
author | Oliver Neukum <oliver@neukum.org> | 2008-06-25 12:17:16 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-07-21 22:16:37 (GMT) |
commit | 830f4021a8d5ce97c6bed267132e5e90fb166192 (patch) | |
tree | a07956625a505ebfd808f39ce8cb698db3dc358d | |
parent | 62ad296b6ca78bd123864c138814c0a597873693 (diff) | |
download | linux-830f4021a8d5ce97c6bed267132e5e90fb166192.tar.xz |
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: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r-- | drivers/usb/class/cdc-acm.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index ba86fec..93b28ee 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -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); |