linux-kernel - [ 055/117] USB: cdc-wdm: poll must return POLLHUP if device is gone

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Message-Id: <20120528031210.479274536@decadent.org.uk>
Date:	Mon, 28 May 2012 04:12:57 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Bjørn Mork <bjorn@...k.no>,
	Oliver Neukum <oliver@...kum.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
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 <bjorn@...k.no>

commit 616b6937e348ef2b4c6ea5fef2cd3c441145efb0 upstream.

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

Cc: Oliver Neukum <oliver@...kum.org>
Signed-off-by: Bjørn Mork <bjorn@...k.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 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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