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>
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b4026c4584
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@ -542,6 +542,8 @@ static int wdm_open(struct inode *inode, struct file *file)
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mutex_lock(&desc->lock);
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if (!desc->count++) {
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desc->werr = 0;
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desc->rerr = 0;
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rv = usb_submit_urb(desc->validity, GFP_KERNEL);
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if (rv < 0) {
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desc->count--;
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@ -853,6 +855,18 @@ static int wdm_pre_reset(struct usb_interface *intf)
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struct wdm_device *desc = usb_get_intfdata(intf);
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mutex_lock(&desc->lock);
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kill_urbs(desc);
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/*
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* we notify everybody using poll of
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* an exceptional situation
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* must be done before recovery lest a spontaneous
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* message from the device is lost
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*/
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spin_lock_irq(&desc->iuspin);
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desc->rerr = -EINTR;
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spin_unlock_irq(&desc->iuspin);
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wake_up_all(&desc->wait);
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return 0;
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}
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