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Date:	Mon, 28 May 2012 04:12:57 +0100
From:	Ben Hutchings <>
	Bjørn Mork <>,
	Oliver Neukum <>,
	Greg Kroah-Hartman <>
Subject: [ 055/117] USB: cdc-wdm: poll must return POLLHUP if device is gone

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


From: Bjørn Mork <>

commit 616b6937e348ef2b4c6ea5fef2cd3c441145efb0 upstream.

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

Cc: Oliver Neukum <>
Signed-off-by: Bjørn Mork <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Ben Hutchings <>
 drivers/usb/class/cdc-wdm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 5d15165..7652275 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -548,7 +548,7 @@ static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
 	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;

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