linux-kernel - [PATCH 02/11 V2] radeon: evergreen: Fix probable mask then right shift defect

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Date:	Mon, 27 Oct 2014 07:14:57 -0700
From:	Joe Perches <joe@...ches.com>
To:	Michel Dänzer <michel@...nzer.net>
Cc:	Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: [PATCH 02/11 V2] radeon: evergreen: Fix probable mask then right
 shift defect

Precedence of & and >> is not the same and is not left to right.
shift has higher precedence and should be done after the mask.

Add parentheses around the mask.

Use the already #defined values instead of hardcoding.

Signed-off-by: Joe Perches <joe@...ches.com>
---
> I think this should be NUM_SHADER_ENGINES_SHIFT?

(Joe can't type)

exactly right, thanks Michel

 drivers/gpu/drm/radeon/evergreen.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index a31f1ca..a97a685 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -3303,7 +3303,8 @@ static void evergreen_gpu_init(struct radeon_device *rdev)
 	rdev->config.evergreen.tile_config |=
 		((gb_addr_config & 0x30000000) >> 28) << 12;
 
-	num_shader_engines = (gb_addr_config & NUM_SHADER_ENGINES(3) >> 12) + 1;
+	num_shader_engines = ((gb_addr_config & NUM_SHADER_ENGINES_MASK)
+			      >> NUM_SHADER_ENGINES_SHIFT) + 1;
 
 	if ((rdev->family >= CHIP_CEDAR) && (rdev->family <= CHIP_HEMLOCK)) {
 		u32 efuse_straps_4;


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