[lkml]   [2015]   [Sep]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [1/4] gpio: gpio-f7188x: Use mutex for access serialisation.
Hello Simon,

On Thu, 10 Sep 2015 00:01:40 +0200, Simon Guinot
<> wrote:
> Vincent (Donnefort) finally succeeds to reproduce the issue. The setup
> is quite simple. You only have to flood the gpio-f7188x driver via the
> sysfs GPIO interface. Nothing more is needed.
> After some debugging we discovered that the problem comes from the
> __request_region function which don't handle very well concurrent
> requests on a muxed region.
> I will send a patch as a reply to this email. Please, can you test it ?

I reverted my mutex-adding commit, applied given patch, and could not
reproduce the error after a few minutes with my test-case, so I think
this solves the issue.

Tested-by: Vincent Pelletier <>

I rebased my others gpio patches, unrelated to this issue:

gpio: gpio-f7188x: Implement get_direction.
gpio: gpio-f7188x: "get" should retrieve sensed level when available.
gpio: gpio-f7188x: GPIO bank 0 bit 0 is not available on f71869a

Should I resend ?
I have not checked other model's datasheets, FWIW.

Vincent Pelletier

 \ /
  Last update: 2015-09-12 15:41    [W:0.096 / U:0.692 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site