linux-kernel - [PATCH] drm/radeon: adjust tested variable

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Date:   Sat, 27 Jan 2018 15:28:15 +0100
From:   Julia Lawall <Julia.Lawall@...6.fr>
To:     Alex Deucher <alexander.deucher@....com>
Cc:     kernel-janitors@...r.kernel.org,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>, amd-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/radeon: adjust tested variable

Check the variable that was most recently initialized.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression x, y, f, g, e, m;
statement S1,S2,S3,S4;
@@

x = f(...);
if (\(<+...x...+>\&e\)) S1 else S2
(
x = g(...);
|
m = g(...,&x,...);
|
y = g(...);
*if (e)
 S3 else S4
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/gpu/drm/radeon/radeon_uvd.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index d34d1cf..95f4db7 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -995,7 +995,7 @@ int radeon_uvd_calc_upll_dividers(struct radeon_device *rdev,
 		/* calc dclk divider with current vco freq */
 		dclk_div = radeon_uvd_calc_upll_post_div(vco_freq, dclk,
 							 pd_min, pd_even);
-		if (vclk_div > pd_max)
+		if (dclk_div > pd_max)
 			break; /* vco is too big, it has to stop */
 
 		/* calc score with current vco freq */