lkml.org 
[lkml]   [2017]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] drm/i2c: tda998x: Fix lockdep warning about possible circular dependency
On Thu, Jul 20, 2017 at 01:54:04PM +0100, Liviu Dudau wrote:
> On Thu, Jul 20, 2017 at 12:44:49PM +0100, Russell King - ARM Linux wrote:
> > Actually, scrub that idea - drm_helper_probe_single_connector_modes()
> > calls drm_edid_to_eld() for these cases anyway, so we must call
> > drm_helper_probe_single_connector_modes() with the audio_mutex held.
>
> OK, so the lockdep warning is spurious?

I don't think so. I think there's two ways to solve this:

1. replace the audio_mutex in tda998x_audio_get_eld() and
tda998x_connector_fill_modes() with a new mutex (eld_mutex) to
protect just the ELD.

2. remove the mutex from these two functions, and take the connection_mutex
modeset lock in tda998x_audio_get_eld().

However, I don't have a view on which would be best.

--
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.

\
 
 \ /
  Last update: 2017-07-20 23:22    [W:0.064 / U:0.104 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site