Commit 858e9d4a authored by Lu Baolu's avatar Lu Baolu Committed by Greg Kroah-Hartman

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

commit 19454462 upstream.

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: default avatarTang Jian Qiang <jianqiang.tang@intel.com>
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Acked-by: default avatarOliver Neukum <oneukum@suse.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 8d85f027
......@@ -428,7 +428,8 @@ static void acm_read_bulk_callback(struct urb *urb)
set_bit(rb->index, &acm->read_urbs_free);
dev_dbg(&acm->data->dev, "%s - non-zero urb status: %d\n",
__func__, status);
return;
if ((status != -ENOENT) || (urb->actual_length == 0))
return;
}
usb_mark_last_busy(acm->dev);
......
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