On 09/03/2018 06:54 PM, Daniel Vetter wrote:
The idea behind allowing drivers to override legacy ioctls (instead of
using the generic implementations unconditionally) is to handle bugs
in old driver-specific userspace. Like e.g. vmw_kms_set_config does,
to work around some vmwgfx userspace not clearing its ioctl structs
properly.
But you can't use it to augment semantics and put in additional
checks, since from a correctly working userspace's pov there should
not be any difference in behaviour between the legacy and the atomic
paths.
vmwgfx seems to be doing some strange things in its page_flip
handlers. Since I'm not an expert of this codebase just wrap some
FIXME comments around the potentially problematic code.
Thanks for the patch, Daniel
Your comments seem valid. We'll try to fix this internally before the
next merge window rather than to add the FIXMEs
/Thomas
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