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USB: cdc-wdm: reset handling according to new requirements

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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>
This commit is contained in:
Oliver Neukum 2011-04-29 14:12:21 +02:00 committed by Greg Kroah-Hartman
parent b4026c4584
commit d771d8aa37
1 changed files with 14 additions and 0 deletions
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14
drivers/usb/class/cdc-wdm.c
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@ -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;
}