diff options
| author | Oliver Neukum <oliver@neukum.org> | 2011-04-29 14:12:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-04-29 17:04:40 -0700 |
| commit | d771d8aa37805f5bf75808b12b737f39ee97f5d4 (patch) | |
| tree | bd491a31ffc2803d78b45fa23b7c347a35af717f /drivers | |
| parent | b4026c4584cd70858d4d3450abfb1cd0714d4f32 (diff) | |
| download | linux-d771d8aa37805f5bf75808b12b737f39ee97f5d4.tar.bz2 | |
USB: cdc-wdm: reset handling according to new requirements
This patch
- ensures no IO takes place during resets
- reports resets to user space
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index a97c018dd419..2b9ff518b509 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -542,6 +542,8 @@ static int wdm_open(struct inode *inode, struct file *file) mutex_lock(&desc->lock); if (!desc->count++) { + desc->werr = 0; + desc->rerr = 0; rv = usb_submit_urb(desc->validity, GFP_KERNEL); if (rv < 0) { desc->count--; @@ -853,6 +855,18 @@ static int wdm_pre_reset(struct usb_interface *intf) struct wdm_device *desc = usb_get_intfdata(intf); mutex_lock(&desc->lock); + kill_urbs(desc); + + /* + * we notify everybody using poll of + * an exceptional situation + * must be done before recovery lest a spontaneous + * message from the device is lost + */ + spin_lock_irq(&desc->iuspin); + desc->rerr = -EINTR; + spin_unlock_irq(&desc->iuspin); + wake_up_all(&desc->wait); return 0; } |