Hi,
This is the third version of the media IOCTL handling rework set. What's
changed since v2:
patch 3:
- Remove function to calculate maximum argument size, replace by a char
array of 256 or kmalloc() if that's too small.
- info->arg_from_user() may fail. Check the return code.
- Instead of providing a no-operation of a copy function, check whether one is
defined. If not, don't call one.
patch 4:
- Arrange the flags field next to cmd, which is an integer. This avoids
creating extra holes in the struct memory layout.
patch 5:
- Use a list of supported argument sizes instead of a minimum value.
---
The patches themselves have been reworked so I don't detail the changes
in this set. What's noteworthy however is that the set adds support for
variable length IOCTL arguments.
(The motivation for these patches is having found myself pondering whether
to have nine or thirteen reserved fields for the request IOCTL. I decided
to address the problem instead. If this is found workable on the media
controller we could follow the same model on V4L2.)
--
Kind regards,
Sakari
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