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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@huawei.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Pan Zhang 2019-12-18 11:50:08 +08:00 committed by Alex Deucher
parent 719423f670
commit d012ea925d
1 changed files with 0 additions and 5 deletions
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5
drivers/gpu/drm/radeon/atombios_i2c.c
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@ -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;
}