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96710819d0
The macros IN_FROM_REG, TEMP_FROM_REG, and RPM_FROM_REG evaluate their arguments multiple times. These macros are used in lockless show functions involving shared driver data, leading to Time-of-Check to Time-of-Use race conditions. For example, RPM_FROM_REG checks if a value is 0 or 255, and then uses it in a division. If the value is modified by another thread to 0 after the check but before the division, it causes a divide-by-zero error. Convert these macros to static functions. This guarantees that arguments are evaluated only once (pass-by-value), fixing the race conditions. Adhere to the principle of minimal changes by only converting the specific macros involved in these lockless contexts. Link: https://lore.kernel.org/all/CALbr=LYJ_ehtp53HXEVkSpYoub+XYSTU8Rg=o1xxMJ8=5z8B-g@mail.gmail.com/ Signed-off-by: Gui-Dong Han <hanguidong02@gmail.com> Link: https://lore.kernel.org/r/20251120041331.1917570-1-hanguidong02@gmail.com Signed-off-by: Guenter Roeck <linux@roeck-us.net>
1376 lines
37 KiB
1376 lines
37 KiB