[Intel-gfx] [PATCH 07/15] drm/i915: Check the timeout passed to i915_wait_request

[Chris Wilson]

On Sun, Nov 29, 2015 at 08:48:05AM +0000, Chris Wilson wrote:
> We have relied upon the sole caller (wait_ioctl) validating the timeout
> argument. However, when waiting for multiple requests I forgot to ensure
> that the timeout was still positive on the later requests. This is more
> simply done inside __i915_wait_request.
> 
> Fixes a minor regression introduced in
> 
> commit b47161858ba13c9c7e03333132230d66e008dd55
> Author: Chris Wilson <chris at chris-wilson.co.uk>
> Date:   Mon Apr 27 13:41:17 2015 +0100
> 
>     drm/i915: Implement inter-engine read-read optimisations
> 
> where we may end up waiting for an extra jiffie for each active ring
> after consuming all of the user's timeout.

where we may end up waiting for an extra jiffie (added by
nsecs_to_jiffie_timeout to guarantee minimum duration) for each active
ring after consuming all of the user's timeout
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre