Tell the kernel to discard USB requests when they time out.

Tell the kernel to discard USB requests when they time out.

This patch adds a call to USBDEVFS_DISCARDURB when we time out a USB
transfer. This causes the host controller to stop polling the device for
data and means that a later transfer will receive the next bytes that
are sent from the device. Otherwise those bytes will be claimed by the
cancelled transfer and discarded.

BUG=640725
Committed: https://crrev.com/6f91bd7e250f649c06e1059033943d56dbf0a79f
Cr-Commit-Position: refs/heads/master@{#414635}

[Reilly Grant (use Gerrit), 2016-08-25 00:28:41]

The CQ bit was checked by reillyg@chromium.org to run a CQ dry run

[Reilly Grant (use Gerrit), 2016-08-25 00:29:00]

reillyg@chromium.org changed reviewers:
+ juncai@chromium.org

[Reilly Grant (use Gerrit), 2016-08-25 00:29:01]

Please take a look.

[commit-bot: I haz the power, 2016-08-25 00:29:51]

Dry run: CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-25 02:10:05]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-08-25 02:10:06]

Dry run: This issue passed the CQ dry run.

[juncai, 2016-08-26 01:08:40]

LGTM.

[Reilly Grant (use Gerrit), 2016-08-26 01:22:52]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2016-08-26 01:23:35]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-08-26 02:42:21]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-08-26 02:45:08]

Description was changed from

==========
Tell the kernel to discard USB requests when they time out.

This patch adds a call to USBDEVFS_DISCARDURB when we time out a USB
transfer. This causes the host controller to stop polling the device for
data and means that a later transfer will receive the next bytes that
are sent from the device. Otherwise those bytes will be claimed by the
cancelled transfer and discarded.

BUG=640725
==========

to

==========
Tell the kernel to discard USB requests when they time out.

This patch adds a call to USBDEVFS_DISCARDURB when we time out a USB
transfer. This causes the host controller to stop polling the device for
data and means that a later transfer will receive the next bytes that
are sent from the device. Otherwise those bytes will be claimed by the
cancelled transfer and discarded.

BUG=640725

Committed: https://crrev.com/6f91bd7e250f649c06e1059033943d56dbf0a79f
Cr-Commit-Position: refs/heads/master@{#414635}
==========

[commit-bot: I haz the power, 2016-08-26 02:45:09]

Patchset 1 (id:??) landed as
https://crrev.com/6f91bd7e250f649c06e1059033943d56dbf0a79f
Cr-Commit-Position: refs/heads/master@{#414635}