[ 39/94] USB: cdc-wdm: poll must return POLLHUP if device is gone

[Greg KH]

3.3-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bjørn Mork <bj...@mork.no>

commit 616b6937e348ef2b4c6ea5fef2cd3c441145efb0 upstream.

Else the poll will be restarted indefinitely in a tight loop,
preventing final device cleanup.

Cc: Oliver Neukum <oli...@neukum.org>
Signed-off-by: Bjørn Mork <bj...@mork.no>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/usb/class/cdc-wdm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -511,7 +511,7 @@ static unsigned int wdm_poll(struct file
 
        spin_lock_irqsave(&desc->iuspin, flags);
        if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
-               mask = POLLERR;
+               mask = POLLHUP | POLLERR;
                spin_unlock_irqrestore(&desc->iuspin, flags);
                goto desc_out;
        }


--
To unsubscribe from this list: send the line "unsubscribe stable" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html