diff options
| author | Bin Liu <b-liu@ti.com> | 2016-05-31 10:05:04 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-06-01 14:58:59 -0700 |
| commit | dbac5d07d13e330e6706813c9fde477140fb5d80 (patch) | |
| tree | 0a01a5d981d58b645c87ea29fcba781be628b823 | |
| parent | b5801212229f6ca5c418c68cd1e0548f4b53f624 (diff) | |
usb: musb: host: don't start next rx urb if current one failed
urb->status is set when endpoint csr RXSTALL, H_ERROR, DATAERROR or
INCOMPRX bit is set. Those bits mean a broken pipe, so don't start next
urb when any of these bits is set by checking urb->status.
To minimize the risk of regression, only do so for RX, until we have a
test case to understand the behavior of TX.
The patch fixes system freeze issue caused by repeatedly invoking RX ISR
while removing a usb uart device connected to a hub, in which case the
hub has no chance to report the disconnect event due to the kernel is
busy in processing the RX interrupt flooding.
Fix checkpatch complaint (qh != NULL) as while.
Reported-by: Max Uvarov <muvarov@gmail.com>
Tested-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>