* qla3xxx: u32 constant overflow in fm93c56a_select()
@ 2017-01-15 12:03 Nicolas Iooss
0 siblings, 0 replies; only message in thread
From: Nicolas Iooss @ 2017-01-15 12:03 UTC (permalink / raw)
To: Dept-GELinuxNICDev, netdev; +Cc: linux-kernel
Hello,
In drivers/net/ethernet/qlogic/qla3xxx.c, fm93c56a_select() currently calls:
ql_write_nvram_reg(qdev, spir,
((ISP_NVRAM_MASK << 16) | qdev->eeprom_cmd_data));
and ISP_NVRAM_MASK is defined as (0x000F << 16).
ql_write_nvram_reg() writes a 32-bit value but (ISP_NVRAM_MASK << 16)
expands to ((0x000F << 16) << 16) = 0xF << 32, which overflows the u32
type. This means the above call is equivalent to:
ql_write_nvram_reg(qdev, spir, qdev->eeprom_cmd_data);
Is this something normal, in which case (ISP_NVRAM_MASK << 16) would be
removed, or a bug?
Thanks,
Nicolas
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