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f5fbb83f |
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29-May-2020 |
Mauro Carvalho Chehab <mchehab+huawei@kernel.org> |
media: atomisp: add SPDX headers This driver is licensed under GPL 2.0, as stated inside their headers. Add the proper tag there. We should probably latter cleanup the reduntant licensing text, but this could be done later, after we get rid of other abstraction layers. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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bacefb07 |
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27-May-2020 |
Nathan Chancellor <nathan@kernel.org> |
media: atomisp: Avoid overflow in compute_blending Clang warns: drivers/staging/media/atomisp/pci/isp/kernels/xnr/xnr_3.0/ia_css_xnr3.host.c:129:35: warning: implicit conversion from 'unsigned long' to 'int32_t' (aka 'int') changes value from 18446744073709543424 to -8192 [-Wconstant-conversion] return MAX(MIN(isp_strength, 0), -XNR_BLENDING_SCALE_FACTOR); ~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~ XNR_BLENDING_SCALE_FACTOR is BIT(13), or 8192, which will easily fit into a signed 32-bit integer. However, it is an unsigned long, which means that negating it is the same as subtracting that value from ULONG_MAX + 1, which causes it to be larger than a signed 32-bit integer so it gets implicitly converted. We can avoid this by using the variable isp_scale, which holds the value of XNR_BLENDING_SCALE_FACTOR already, where the implicit conversion from unsigned long to s32 already happened. If that were to ever overflow, clang would warn: https://godbolt.org/z/EeSxLG Link: https://github.com/ClangBuiltLinux/linux/issues/1036 Signed-off-by: Nathan Chancellor <natechancellor@gmail.com> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
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