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| author | Imre Deak <imre.deak@intel.com> | 2013-05-21 20:03:17 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2013-05-22 13:51:15 +0200 |
| commit | df97729f1bcb5055ba414f08b48364d46c6baef0 (patch) | |
| tree | c7a0f7bbf5d185d7d92d56abe6df72c26756b5d0 /drivers/gpu/drm | |
| parent | e3de42b68478a8c95dd27520e9adead2af9477a5 (diff) | |
| download | op-kernel-dev-df97729f1bcb5055ba414f08b48364d46c6baef0.zip op-kernel-dev-df97729f1bcb5055ba414f08b48364d46c6baef0.tar.gz | |
drm/i915: add msecs_to_jiffies_timeout to guarantee minimum duration
We need this to avoid premature timeouts whenever scheduling a timeout
based on the current jiffies value. For an explanation see [1].
The following patches will take the helper into use.
Once the more generic solution proposed in the thread at [1] is accepted
this patch can be reverted while keeping the follow-up patches.
[1] http://marc.info/?l=linux-kernel&m=136854294730957&w=2
Signed-off-by: Imre Deak <imre.deak@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index d5dcf7f..b9d00dc 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -1943,4 +1943,19 @@ static inline void __user *to_user_ptr(u64 address) return (void __user *)(uintptr_t)address; } +static inline unsigned long msecs_to_jiffies_timeout(const unsigned int m) +{ + unsigned long j = msecs_to_jiffies(m); + + return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1); +} + +static inline unsigned long +timespec_to_jiffies_timeout(const struct timespec *value) +{ + unsigned long j = timespec_to_jiffies(value); + + return min_t(unsigned long, MAX_JIFFY_OFFSET, j + 1); +} + #endif |
