linux-kernel - [PATCH] drm/msm/dpu: Fix smatch warnings about variable dereferenced before check

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Message-Id: <20260129024711.30268-1-sunliming@linux.dev>
Date: Thu, 29 Jan 2026 10:47:11 +0800
From: sunliming@...ux.dev
To: robin.clark@....qualcomm.com,
	lumag@...nel.org,
	airlied@...il.com,
	simona@...ll.ch
Cc: sean@...rly.run,
	marijn.suijten@...ainline.org,
	linux-arm-msm@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	freedreno@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	sunliming <sunliming@...inos.cn>,
	kernel test robot <lkp@...el.com>,
	Dan Carpenter <error27@...il.com>
Subject: [PATCH] drm/msm/dpu: Fix smatch warnings about variable dereferenced before check

From: sunliming <sunliming@...inos.cn>

Fix below smatch warnings:
drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c:161 dpu_hw_sspp_setup_pe_config_v13()
warn: variable dereferenced before check 'ctx' (see line 159)

Reported-by: kernel test robot <lkp@...el.com>
Reported-by: Dan Carpenter <error27@...il.com>
Closes: https://lore.kernel.org/r/202601252214.oEaY3UZM-lkp@intel.com/
Signed-off-by: sunliming <sunliming@...inos.cn>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c
index e65f1fc026fd..312ee6597ab1 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c
+++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_sspp_v13.c
@@ -156,11 +156,13 @@ static void dpu_hw_sspp_setup_pe_config_v13(struct dpu_hw_sspp *ctx,
 	u8 color;
 	u32 lr_pe[4], tb_pe[4];
 	const u32 bytemask = 0xff;
-	u32 offset = ctx->cap->sblk->sspp_rec0_blk.base;
+	u32 offset;
 
 	if (!ctx || !pe_ext)
 		return;
 
+	u32 offset = ctx->cap->sblk->sspp_rec0_blk.base;
+
 	c = &ctx->hw;
 	/* program SW pixel extension override for all pipes*/
 	for (color = 0; color < DPU_MAX_PLANES; color++) {
-- 
2.25.1