On Mon, Nov 28, 2022 at 09:13:02PM +0800, Yinbo Zhu wrote: > 在 2022/11/17 16:44, Andy Shevchenko 写道: > > On Thu, Nov 17, 2022 at 03:59:37PM +0800, Yinbo Zhu wrote: ... > > > +start: > > > + mdelay(1); > > Why? > This is a workaroud. You need to add a comment explaining that in details. -- With Best Regards, Andy Shevchenko