linux-kernel - [PATCH 3/3] gpu: drm: dead code elimination

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Message-ID: <1576641008-14880-1-git-send-email-zhangpan26@huawei.com>
Date:   Wed, 18 Dec 2019 11:50:08 +0800
From:   Pan Zhang <zhangpan26@...wei.com>
To:     <zhangpan26@...wei.com>, <hushiyuan@...wei.com>,
        <alexander.deucher@....com>, <christian.koenig@....com>,
        <David1.Zhou@....com>, <airlied@...ux.ie>, <daniel@...ll.ch>
CC:     <amd-gfx@...ts.freedesktop.org>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH 3/3] gpu: drm: dead code elimination

this set adds support for removal of gpu drm dead code.

patch3 is similar with patch 1:
`num` is a data of u8 type and ATOM_MAX_HW_I2C_READ == 255,

so there is a impossible condition '(num > 255) => (0-255 > 255)'.

Signed-off-by: Pan Zhang <zhangpan26@...wei.com>
---
 drivers/gpu/drm/radeon/atombios_i2c.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/radeon/atombios_i2c.c b/drivers/gpu/drm/radeon/atombios_i2c.c
index a570ce4..ab4d210 100644
--- a/drivers/gpu/drm/radeon/atombios_i2c.c
+++ b/drivers/gpu/drm/radeon/atombios_i2c.c
@@ -68,11 +68,6 @@ static int radeon_process_i2c_ch(struct radeon_i2c_chan *chan,
 			memcpy(&out, &buf[1], num);
 		args.lpI2CDataOut = cpu_to_le16(out);
 	} else {
-		if (num > ATOM_MAX_HW_I2C_READ) {
-			DRM_ERROR("hw i2c: tried to read too many bytes (%d vs 255)\n", num);
-			r = -EINVAL;
-			goto done;
-		}
 		args.ucRegIndex = 0;
 		args.lpI2CDataOut = 0;
 	}
-- 
2.7.4