linux-kernel - [PATCH] drm/msm: check for equals 0 only

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Date:   Thu, 25 Apr 2019 16:03:51 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Rob Clark <robdclark@...il.com>
Cc:     Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Abhinav Kumar <abhinavk@...eaurora.org>,
        Jordan Crouse <jcrouse@...eaurora.org>,
        Archit Taneja <architt@...eaurora.org>,
        Daniel Mack <daniel@...que.org>,
        Sibi Sankar <sibis@...eaurora.org>,
        Chandan Uddaraju <chandanu@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH] drm/msm: check for equals 0 only

wait_for_completion_timeout() returns 0 on timeout and aleast 1 otherwise
so checking for < makes no sense here. 

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

Problem located with an experimental coccinelle script

While this check does no harm in this form - it should be fixed anyway
to comply with the API see: kernel/sched/completion.c

Also noticed that get_maintainer.pl will not list linux-kernel@...r.kernel.org
when run on drivers/gpu/drm/msm/dsi/dsi_host.c - is that intentional ?

Patch was compile-tested with: qcom_defconfig (implies DRM_MSM_DSI=y)

Patch is against v5.1-rc6 (localversion-next is next-20190424)

 drivers/gpu/drm/msm/dsi/dsi_host.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c
index 610183d..dc16067 100644
--- a/drivers/gpu/drm/msm/dsi/dsi_host.c
+++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
@@ -1049,7 +1049,7 @@ static void dsi_wait4video_done(struct msm_dsi_host *msm_host)
 	ret = wait_for_completion_timeout(&msm_host->video_comp,
 			msecs_to_jiffies(70));
 
-	if (ret <= 0)
+	if (ret == 0)
 		DRM_DEV_ERROR(dev, "wait for video done timed out\n");
 
 	dsi_intr_ctrl(msm_host, DSI_IRQ_MASK_VIDEO_DONE, 0);
-- 
2.1.4