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Message-Id: <20220621110634.368913-1-sunliming@kylinos.cn>
Date: Tue, 21 Jun 2022 19:06:34 +0800
From: sunliming <sunliming@...inos.cn>
To: quic_abhinavk@...cinc.com, robdclark@...il.com,
dmitry.baryshkov@...aro.org
Cc: linux-kernel@...r.kernel.org, sunliming@...inos.cn,
kelulanainsley@...il.com, kernel test robot <lkp@...el.com>
Subject: [PATCH] drm/msm/dpu: Fix variable dereferenced before check
Fixes the following smatch warning:
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:261
dpu_encoder_phys_wb_atomic_check() warn: variable dereferenced before check 'conn_state'
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: sunliming <sunliming@...inos.cn>
---
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
index 59da348ff339..0ec809ab06e7 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c
@@ -252,11 +252,6 @@ static int dpu_encoder_phys_wb_atomic_check(
DPU_DEBUG("[atomic_check:%d, \"%s\",%d,%d]\n",
phys_enc->wb_idx, mode->name, mode->hdisplay, mode->vdisplay);
- if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
- return 0;
-
- fb = conn_state->writeback_job->fb;
-
if (!conn_state || !conn_state->connector) {
DPU_ERROR("invalid connector state\n");
return -EINVAL;
@@ -267,6 +262,11 @@ static int dpu_encoder_phys_wb_atomic_check(
return -EINVAL;
}
+ if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
+ return 0;
+
+ fb = conn_state->writeback_job->fb;
+
DPU_DEBUG("[fb_id:%u][fb:%u,%u]\n", fb->base.id,
fb->width, fb->height);
--
2.25.1
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