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USB: ldusb should signal an error in poll if the device is disconnected 

poll() should test for a disconnection of the device.

Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2009-07-02 17:01:06 +02:00 committed by Greg Kroah-Hartman
parent d35b4ce164
commit d12b85e7de
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/misc/ldusb.c
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@ -412,6 +412,9 @@ static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
dev = file->private_data;
if (!dev->intf)
return POLLERR | POLLHUP;
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
@ -767,6 +770,9 @@ static void ld_usb_disconnect(struct usb_interface *intf)
ld_usb_delete(dev);
} else {
dev->intf = NULL;
/* wake up pollers */
wake_up_interruptible_all(&dev->read_wait);
wake_up_interruptible_all(&dev->write_wait);
mutex_unlock(&dev->mutex);
}