lkml.org 
[lkml]   [2021]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2 1/1] net: fec: ptp: avoid register access when ipg clock is disabled
On Thu, Feb 25, 2021 at 10:15:16PM +0100, Heiko Thiery wrote:
> When accessing the timecounter register on an i.MX8MQ the kernel hangs.
> This is only the case when the interface is down. This can be reproduced
> by reading with 'phc_ctrl eth0 get'.
>
> Like described in the change in 91c0d987a9788dcc5fe26baafd73bf9242b68900
> the igp clock is disabled when the interface is down and leads to a
> system hang.
>
> So we check if the ptp clock status before reading the timecounter
> register.
>
> Signed-off-by: Heiko Thiery <heiko.thiery@gmail.com>
> ---
> v2:
> - add mutex (thanks to Richard)
>
> v3:
> I did a mistake and did not test properly
> - add parenteses
> - fix the used variable

Acked-by: Richard Cochran <richardcochran@gmail.com>

\
 
 \ /
  Last update: 2021-02-26 16:24    [W:0.084 / U:0.532 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site