Re: [PATCH] auxdisplay: charlcd: delete mdelay in long_sleep

[Miguel Ojeda]

On Mon, Jan 29, 2018 at 7:50 AM, Willy Tarreau <w@xxxxxx> wrote:
> Hi,
>
> On Fri, Jan 26, 2018 at 11:19:15PM +0800, Jia-Ju Bai wrote:
>> The function long_sleep() calls mdelay() when in an interrupt handler.
>> But only charlcd_clear_display() and charlcd_init_display calls
>> long_sleep(), and my tool finds that the two functions
>> are never called in an interrupt handler.
>> Thus mdelay() and in_interrupt() are not necessary.
>>
>> This is found by a static analysis tool named DCNS written by myself.
>
> Looks good. This code is extremely old (started in 2.2) so I'm not
> surprised at all that after many changes such parts are not used
> anymore.

By the way, maybe msleep_interruptible() should be used instead?
(since I guess you want a minimum time here, no?). It would also take
care of the jiffies to ms conversion, so the whole long_jump could be
removed.

>
> Acked-by: Willy Tarreau <w@xxxxxx>
>
> Willy