From df97729f1bcb5055ba414f08b48364d46c6baef0 Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Tue, 21 May 2013 20:03:17 +0300 Subject: [PATCH] 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 Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_drv.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) 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 -- 2.7.4