usb: cdc-acm: handle unlinked urb in acm read callback

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[ Upstream commit 19454462ac ]

In current acm driver, the bulk-in callback function ignores the
URBs unlinked in usb core.

This causes unexpected data loss in some cases. For example,
runtime suspend entry will unlinked all urbs and set urb->status
to -ENOENT even those urbs might have data not processed yet.
Hence, data loss occurs.

This patch lets bulk-in callback function handle unlinked urbs
to avoid data loss.

Signed-off-by: Tang Jian Qiang <jianqiang.tang@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Cc: stable@vger.kernel.org
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

...

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Lu Baolu 2015-12-30 12:59:08 +08:00 • committed by Sasha Levin

parent 51adf86560

commit 00529740d1

1 changed files with 2 additions and 1 deletions

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drivers/usb/class/cdc-acm.c

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