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simple_strtoul() is obsolete and lacks proper error handling, making it unsafe for converting strings to unsigned long values. Replace it with kstrtoul(), which provides robust error checking and better safety. This change improves the reliability of the string-to-integer conversion and aligns with current kernel coding standards. Error handling is added to catch conversion failures, returning -EINVAL when input is invalid. Issue reported by checkpatch: - WARNING: simple_strtoul is obsolete, use kstrtoul instead Signed-off-by: Riyan Dhiman <riyandhiman14@gmail.com> Link: https://lore.kernel.org/r/20240901182244.45543-1-riyandhiman14@gmail.com Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>