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USB: cdc-wdm: poll must return POLLHUP if device is gone
author
Bjørn Mork
<bjorn@mork.no>
Wed, 9 May 2012 11:53:21 +0000
(13:53 +0200)
committer
Greg Kroah-Hartman
<gregkh@linuxfoundation.org>
Fri, 11 May 2012 22:19:22 +0000
(15:19 -0700)
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>
drivers/usb/class/cdc-wdm.c
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diff --git
a/drivers/usb/class/cdc-wdm.c
b/drivers/usb/class/cdc-wdm.c
index 5d151653ae432b86385d8159660200b0b0d1c7d9..765227575d3b21436f7f9fd5c4b6f4cd8c95eff7 100644
(file)
--- 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 = POLL
HUP | POLL
ERR;
spin_unlock_irqrestore(&desc->iuspin, flags);
goto desc_out;
}