Attachment 63867 Details for Bug 51738 – Kill the delay in wait_for_atomic()

[patch] Kill the delay in wait_for_atomic()

0001-bug-51738-special.patch (text/plain), 1.04 KB, created by Chris Wilson on 2012-07-05 10:34:54 UTC

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Creator: Chris Wilson

Created: 2012-07-05 10:34:54 UTC

Size: 1.04 KB

patch

obsolete

>From fc038e1f3f024dc3c52c8fe2c67ff52c36700a15 Mon Sep 17 00:00:00 2001
>From: Chris Wilson <chris@chris-wilson.co.uk>
>Date: Thu, 5 Jul 2012 18:31:12 +0100
>Subject: [PATCH] bug 51738 special
>
>---
> drivers/gpu/drm/i915/intel_drv.h |   19 ++++++++++---------
> 1 file changed, 10 insertions(+), 9 deletions(-)
>
>diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
>index 4548139..6638ad3 100644
>--- a/drivers/gpu/drm/i915/intel_drv.h
>+++ b/drivers/gpu/drm/i915/intel_drv.h
>@@ -46,15 +46,16 @@
> })
> 
> #define wait_for_atomic_us(COND, US) ({ \
>-	int i, ret__ = -ETIMEDOUT;	\
>-	for (i = 0; i < (US); i++) {	\
>-		if ((COND)) {		\
>-			ret__ = 0;	\
>-			break;		\
>-		}			\
>-		udelay(1);		\
>-	}				\
>-	ret__;				\
>+	unsigned long timeout__ = jiffies + usecs_to_jiffies(US);	\
>+	int ret__ = 0;							\
>+	while (!(COND)) {						\
>+		if (time_after(jiffies, timeout__)) {			\
>+			ret__ = -ETIMEDOUT;				\
>+			break;						\
>+		}							\
>+		cpu_relax();						\
>+	}								\
>+	ret__;								\
> })
> 
> #define wait_for(COND, MS) _wait_for(COND, MS, 1)
>-- 
>1.7.10
>

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Attachments on bug 51738: 63841 | 63842 | 63849 | 63850 | 63862 | 63867

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