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USB: cdc-wdm: poll must return POLLHUP if device is gone

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

Cc: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bjørn Mork 2012-05-09 13:53:21 +02:00 committed by Greg Kroah-Hartman
parent b8cacf33f0
commit 616b6937e3
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/class/cdc-wdm.c
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@ -548,7 +548,7 @@ static unsigned int wdm_poll(struct file *file, struct poll_table_struct *wait)
spin_lock_irqsave(&desc->iuspin, flags); spin_lock_irqsave(&desc->iuspin, flags);
if (test_bit(WDM_DISCONNECTING, &desc->flags)) { if (test_bit(WDM_DISCONNECTING, &desc->flags)) {
mask = POLLERR; mask = POLLHUP | POLLERR;
spin_unlock_irqrestore(&desc->iuspin, flags); spin_unlock_irqrestore(&desc->iuspin, flags);
goto desc_out; goto desc_out;
} }