linux-kernel - [PATCH 1/2] fbdev: omapfb: Remove writeback deadcode

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Message-ID: <20250318211959.8557-1-arapovl839@gmail.com>
Date: Tue, 18 Mar 2025 21:19:51 +0000
From: Leonid Arapov <arapovl839@...il.com>
To: Helge Deller <deller@....de>
Cc: Leonid Arapov <arapovl839@...il.com>,
	Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
	"Dr. David Alan Gilbert" <linux@...blig.org>,
	Uwe Kleine-König <u.kleine-koenig@...libre.com>,
	linux-omap@...r.kernel.org,
	linux-fbdev@...r.kernel.org,
	dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org,
	lvc-project@...uxtesting.org
Subject: [PATCH 1/2] fbdev: omapfb: Remove writeback deadcode

Value of enum parameter 'plane' is initialized in dss_init_overlays and
cannot take the value OMAP_DSS_WB. Function dispc_ovl_setup_common could
be called with this value of parameter only from dispc_wb_setup, which has
never been used and has been removed in commit 4f55bb03801a
("omapfb: Remove unused writeback code"). The code in the if-branch is
unreachable.

Remove unreachable branch.

Found by Linux Verification Center (linuxtesting.org) with SVACE static
analysis tool.

Signed-off-by: Leonid Arapov <arapovl839@...il.com>
---
 drivers/video/fbdev/omap2/omapfb/dss/dispc.c | 9 ++-------
 1 file changed, 2 insertions(+), 7 deletions(-)

diff --git a/drivers/video/fbdev/omap2/omapfb/dss/dispc.c b/drivers/video/fbdev/omap2/omapfb/dss/dispc.c
index ccb96a5be07e..8db074862824 100644
--- a/drivers/video/fbdev/omap2/omapfb/dss/dispc.c
+++ b/drivers/video/fbdev/omap2/omapfb/dss/dispc.c
@@ -2659,13 +2659,8 @@ static int dispc_ovl_setup_common(enum omap_plane plane,
 	row_inc = 0;
 	pix_inc = 0;
 
-	if (plane == OMAP_DSS_WB) {
-		frame_width = out_width;
-		frame_height = out_height;
-	} else {
-		frame_width = in_width;
-		frame_height = height;
-	}
+	frame_width = in_width;
+	frame_height = height;
 
 	if (rotation_type == OMAP_DSS_ROT_TILER)
 		calc_tiler_rotation_offset(screen_width, frame_width,
-- 
2.45.2