linux-kernel - [PATCH linux-next] drm/i915/display: Remove the useless variable offset and its assignment

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Date:   Wed,  8 Dec 2021 07:49:52 +0000
From:   cgel.zte@...il.com
To:     Jani Nikula <jani.nikula@...ux.intel.com>
Cc:     Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, luo penghao <luo.penghao@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: [PATCH linux-next] drm/i915/display: Remove the useless variable offset and its assignment

From: luo penghao <luo.penghao@....com.cn>

The existence of offset is meaningless, so it should be deleted.

The clang_analyzer complains as follows:

Value stored to 'offset' is never read

Reported-by: Zeal Robot <zealci@....com.cn>
Signed-off-by: luo penghao <luo.penghao@....com.cn>
---
 drivers/gpu/drm/i915/display/i9xx_plane.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/i9xx_plane.c b/drivers/gpu/drm/i915/display/i9xx_plane.c
index b1439ba..a478b7f 100644
--- a/drivers/gpu/drm/i915/display/i9xx_plane.c
+++ b/drivers/gpu/drm/i915/display/i9xx_plane.c
@@ -964,7 +964,7 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 	struct intel_plane *plane = to_intel_plane(crtc->base.primary);
 	enum i9xx_plane_id i9xx_plane = plane->i9xx_plane;
 	enum pipe pipe;
-	u32 val, base, offset;
+	u32 val, base;
 	int fourcc, pixel_format;
 	unsigned int aligned_height;
 	struct drm_framebuffer *fb;
@@ -1006,14 +1006,14 @@ i9xx_get_initial_plane_config(struct intel_crtc *crtc,
 	fb->format = drm_format_info(fourcc);
 
 	if (IS_HASWELL(dev_priv) || IS_BROADWELL(dev_priv)) {
-		offset = intel_de_read(dev_priv, DSPOFFSET(i9xx_plane));
+		intel_de_read(dev_priv, DSPOFFSET(i9xx_plane));
 		base = intel_de_read(dev_priv, DSPSURF(i9xx_plane)) & 0xfffff000;
 	} else if (DISPLAY_VER(dev_priv) >= 4) {
 		if (plane_config->tiling)
-			offset = intel_de_read(dev_priv,
+			intel_de_read(dev_priv,
 					       DSPTILEOFF(i9xx_plane));
 		else
-			offset = intel_de_read(dev_priv,
+			intel_de_read(dev_priv,
 					       DSPLINOFF(i9xx_plane));
 		base = intel_de_read(dev_priv, DSPSURF(i9xx_plane)) & 0xfffff000;
 	} else {
-- 
2.15.2