Hi, On 6/29/21 11:07 AM, 赵仪峰 wrote: > > > The variable types are different, IS_ERR_VALUE(host->max_clk) will not got the right results. > > unsigned int max_clk; > > #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO) Thanks for kindly explanation. I didn't check its type. Best Regards, Jaehoon Chung >