]> git.baikalelectronics.ru Git - kernel.git/commit
net: qla3xxx: Remove overflowing shift statement
authorNathan Chancellor <natechancellor@gmail.com>
Sat, 13 Oct 2018 02:14:58 +0000 (19:14 -0700)
committerDavid S. Miller <davem@davemloft.net>
Thu, 18 Oct 2018 04:52:40 +0000 (21:52 -0700)
commita5e15805496b37ca5480972b7e202b12c178d44f
tree72fa781c083b785755bf1415b43dc45b7331071e
parent14c38a6c9d778f6a40728e4527610c26d9404d3e
net: qla3xxx: Remove overflowing shift statement

Clang currently warns:

drivers/net/ethernet/qlogic/qla3xxx.c:384:24: warning: signed shift
result (0xF00000000) requires 37 bits to represent, but 'int' only has
32 bits [-Wshift-overflow]
                    ((ISP_NVRAM_MASK << 16) | qdev->eeprom_cmd_data));
                      ~~~~~~~~~~~~~~ ^  ~~
1 warning generated.

The warning is certainly accurate since ISP_NVRAM_MASK is defined as
(0x000F << 16) which is then shifted by 16, resulting in 64424509440,
well above UINT_MAX.

Given that this is the only location in this driver where ISP_NVRAM_MASK
is shifted again, it seems likely that ISP_NVRAM_MASK was originally
defined without a shift and during the move of the shift to the
definition, this statement wasn't properly removed (since ISP_NVRAM_MASK
is used in the statenent right above this). Only the maintainers can
confirm this since this statment has been here since the driver was
first added to the kernel.

Link: https://github.com/ClangBuiltLinux/linux/issues/127
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/net/ethernet/qlogic/qla3xxx.c