lkml.org 
[lkml]   [2014]   [Aug]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: 3.17-rc1: leds blink workqueue causes sleeping BUGs
Hello,

Sabrina Dubroca, le Mon 25 Aug 2014 23:13:40 +0200, a écrit :
> 2014-08-19, 13:06:07 -0400, Valdis.Kletnieks@vt.edu wrote:
> > On Sat, 16 Aug 2014 20:27:01 -0700, Hugh Dickins said:
> > > Can we safely revert your 8b37e1bef5a6 ("leds: convert blink timer to
> > > workqueue"), or have there been other changes which now depend upon it?
> >
> > I suspect there's something else busted. I hand-reverted that patch, and I *still*
> > see the following lockdep whine that looks related (as it talks about
> > leddev_list_lock). next-0811 was OK, looks like next-0815 and -0818 had this....
>
> I had a look at the code, led_trigger_event calls vt_led_set, which
> calls led_trigger_event again.

Yes, that is expected: the vt::* leds actually generate the
corresponding vt-* trigger events, which are used by the various
input*::* leds. We could indeed have a loop if the user was making the
VT::* leds use the vt-* trigger, but otherwise it's safe since it's a
different trigger. We can add code to prevent the user from building
loops, but otherwise it's a false positive.

Samuel
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2014-08-25 23:41    [W:0.084 / U:0.152 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site