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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Alex Deucher <alexander.deucher@amd.com>,
	yu kuai <yukuai3@huawei.com>,
	dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org,
	Sasha Levin <sashal@kernel.org>
Subject: [PATCH AUTOSEL 4.19 057/252] drm/amdgpu: remove always false comparison in 'amdgpu_atombios_i2c_process_i2c_ch'
Date: Fri, 14 Feb 2020 11:08:32 -0500
Message-ID: <20200214161147.15842-57-sashal@kernel.org> (raw)
In-Reply-To: <20200214161147.15842-1-sashal@kernel.org>

From: yu kuai <yukuai3@huawei.com>

[ Upstream commit 220ac8d1444054ade07ce14498fcda266410f90e ]

Fixes gcc '-Wtype-limits' warning:

drivers/gpu/drm/amd/amdgpu/atombios_i2c.c: In function
‘amdgpu_atombios_i2c_process_i2c_ch’:
drivers/gpu/drm/amd/amdgpu/atombios_i2c.c:79:11: warning: comparison is
always false due to limited range of data type [-Wtype-limits]

'num' is 'u8', so it will never be greater than 'TOM_MAX_HW_I2C_READ',
which is defined as 255. Therefore, the comparison can be removed.

Fixes: d38ceaf99ed0 ("drm/amdgpu: add core driver (v4)")
Signed-off-by: yu kuai <yukuai3@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/amd/amdgpu/atombios_i2c.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c b/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
index f9b2ce9a98f3e..9c7d0bf6712ab 100644
--- a/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
+++ b/drivers/gpu/drm/amd/amdgpu/atombios_i2c.c
@@ -76,11 +76,6 @@ static int amdgpu_atombios_i2c_process_i2c_ch(struct amdgpu_i2c_chan *chan,
 		}
 		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;
 	}
-- 
2.20.1

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  parent reply index

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-14 16:07 [PATCH AUTOSEL 4.19 001/252] drm/amdgpu: remove set but not used variable 'mc_shared_chmap' from 'gfx_v6_0.c' and 'gfx_v7_0.c' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 049/252] drm/amd/display: Retrain dongles when SINK_COUNT becomes non-zero Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 054/252] drm/amdgpu: remove 4 set but not used variable in amdgpu_atombios_get_connector_info_from_object_table Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 055/252] drm/amdgpu: remove set but not used variable 'dig_connector' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 056/252] drm/amdgpu: remove set but not used variable 'dig' Sasha Levin
2020-02-14 16:08 ` Sasha Levin [this message]
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 058/252] drm/amdgpu: remove set but not used variable 'mc_shared_chmap' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 059/252] drm/amd/powerplay: remove set but not used variable 'threshold', 'state' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 060/252] drm/amdgpu: remove set but not used variable 'amdgpu_connector' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 061/252] drm/amdgpu: remove set but not used variable 'invalid' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 062/252] drm/amd/powerplay: remove set but not used variable 'us_mvdd' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 067/252] drm/amd/display: remove set but not used variable 'bp' in bios_parser2.c Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 068/252] drm/amd/display: remove set but not used variable 'bp' in bios_parser.c Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 069/252] drm/radeon: remove set but not used variable 'size', 'relocs_chunk' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 070/252] drm/radeon: remove set but not used variable 'backbias_response_time' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 071/252] drm/radeon: remove set but not used variable 'dig_connector' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 072/252] drm/radeon: remove set but not used variable 'radeon_connector' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 073/252] drm/radeon: remove set but not used variable 'blocks' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 074/252] drm/radeon: remove set but not used variable 'tv_pll_cntl1' Sasha Levin
2020-02-14 16:08 ` [PATCH AUTOSEL 4.19 075/252] drm/amdgpu: Ensure ret is always initialized when using SOC15_WAIT_ON_RREG Sasha Levin
2020-02-14 16:10 ` [PATCH AUTOSEL 4.19 182/252] drm/amd/display: fixup DML dependencies Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 236/252] radeon: insert 10ms sleep in dce5_crtc_load_lut Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 245/252] drm/amdgpu/smu10: fix smu10_get_clock_by_type_with_latency Sasha Levin
2020-02-14 16:11 ` [PATCH AUTOSEL 4.19 246/252] drm/amdgpu/smu10: fix smu10_get_clock_by_type_with_voltage Sasha Levin
2020-02-14 16:49   ` Alex Deucher

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