Re: [PATCH v5 2/6] drm/bridge: Add a devm_ allocator for panel bridge.

From: Eric Anholt
Date: Fri Aug 04 2017 - 16:43:32 EST

Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx> writes:

> Hi Eric,
> (CC'ing Daniel)
> Thank you for the patch.
> On Tuesday 18 Jul 2017 14:05:06 Eric Anholt wrote:
>> This will let drivers reduce the error cleanup they need, in
>> particular the "is_panel_bridge" flag.
>> v2: Slight cleanup of remove function by Andrzej
> I just want to point out that, in the context of Daniel's work on hot-unplug,
> 90% of the devm_* allocations are wrong and will get in the way. All DRM core
> objects that are accessible one way or another from userspace will need to be
> properly reference-counted and freed only when the last reference disappears,
> which could be well after the corresponding device is removed. I believe this
> could be one such objects :-/

Sure, if you're hotplugging, your life is pain. For non-hotpluggable
devices, like our SOC platform devices (current panel-bridge consumers),
this still seems like an excellent simplification of memory management.

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