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If you have a control handler that does not contain any controls, then currently calling VIDIOC_G/S/TRY_EXT_CTRLS with count == 0 will return -EINVAL in the class_check() function. This is not correct, there is no reason why this should return an error. The purpose of setting count to 0 is to test if the ioctl can mix controls from different control classes. And this is possible. The fact that there are not actually any controls defined is another matter that is unrelated to this test. This caused v4l2-compliance to fail, so that is fixed with this patch applied. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Reported-by: Dave Stevenson <dave.stevenson@raspberrypi.org> Tested-by: Dave Stevenson <dave.stevenson@raspberrypi.org> Acked-by: Sakari Ailus <sakari.ailus@linux.intel.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com> |
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| README | ||
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.