ImageCapture v4l2: retry reading capabilities

ImageCapture v4l2: retry reading capabilities

The bug illustrates a case in which an ioctl() for reading the photo
capabilities right after opening the device/starting streaming fails,
but work after retrying a few times. (In my repros, the first two
control readings fail, successively working).

This CL reuses the code in ResetUserAndCameraControlsToDefault()
to retry an ioclt a few times for RetrieveUserControlRange().

BUG=670262
Committed: https://crrev.com/047c7091b7159c5ad0037d0e35d74e1e4739e080
Cr-Commit-Position: refs/heads/master@{#439223}

[mcasas, 2016-12-16 03:30:36]

mcasas@chromium.org changed reviewers:
+ emircan@chromium.org

[mcasas, 2016-12-16 03:30:36]

emircan@ PTAL

No templates this time :-)

[emircan, 2016-12-16 19:20:10]

lgtm

[mcasas, 2016-12-16 19:53:08]

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

[commit-bot: I haz the power, 2016-12-16 19:54:18]

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

[mcasas, 2016-12-16 22:16:58]

The CQ bit was unchecked by mcasas@chromium.org

[mcasas, 2016-12-16 22:42:18]

The CQ bit was checked by mcasas@chromium.org

[commit-bot: I haz the power, 2016-12-16 22:43:26]

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, 2016-12-16 22:48:47]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1481928138859390, "parent_rev":
"cff59c1540096c0d94e6d07036249c9f48a5e900", "commit_rev":
"8785b9298c271d180188f94b27bae0e435004b21"}

[commit-bot: I haz the power, 2016-12-16 22:49:11]

Description was changed from

==========
ImageCapture v4l2: retry reading capabilities

The bug illustrates a case in which an ioctl() for reading the photo
capabilities right after opening the device/starting streaming fails,
but work after retrying a few times. (In my repros, the first two
control readings fail, successively working).

This CL reuses the code in ResetUserAndCameraControlsToDefault()
to retry an ioclt a few times for RetrieveUserControlRange().

BUG=670262
==========

to

==========
ImageCapture v4l2: retry reading capabilities

The bug illustrates a case in which an ioctl() for reading the photo
capabilities right after opening the device/starting streaming fails,
but work after retrying a few times. (In my repros, the first two
control readings fail, successively working).

This CL reuses the code in ResetUserAndCameraControlsToDefault()
to retry an ioclt a few times for RetrieveUserControlRange().

BUG=670262

Review-Url: https://codereview.chromium.org/2582723002
==========

[commit-bot: I haz the power, 2016-12-16 22:49:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-12-16 22:50:47]

Description was changed from

==========
ImageCapture v4l2: retry reading capabilities

The bug illustrates a case in which an ioctl() for reading the photo
capabilities right after opening the device/starting streaming fails,
but work after retrying a few times. (In my repros, the first two
control readings fail, successively working).

This CL reuses the code in ResetUserAndCameraControlsToDefault()
to retry an ioclt a few times for RetrieveUserControlRange().

BUG=670262

Review-Url: https://codereview.chromium.org/2582723002
==========

to

==========
ImageCapture v4l2: retry reading capabilities

The bug illustrates a case in which an ioctl() for reading the photo
capabilities right after opening the device/starting streaming fails,
but work after retrying a few times. (In my repros, the first two
control readings fail, successively working).

This CL reuses the code in ResetUserAndCameraControlsToDefault()
to retry an ioclt a few times for RetrieveUserControlRange().

BUG=670262

Committed: https://crrev.com/047c7091b7159c5ad0037d0e35d74e1e4739e080
Cr-Commit-Position: refs/heads/master@{#439223}
==========

[commit-bot: I haz the power, 2016-12-16 22:50:48]

Patchset 1 (id:??) landed as
https://crrev.com/047c7091b7159c5ad0037d0e35d74e1e4739e080
Cr-Commit-Position: refs/heads/master@{#439223}