Commit d12b85e7 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
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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: default avatarOliver Neukum <oliver@neukum.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent d35b4ce1

drivers/usb/misc/ldusb.c

+6 −0
Original line number Diff line number Diff line
@@ -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);

	}