linux-kernel - Re: Issue with DRM and "reimplement IDR and IDA using the radix tree"

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Date:   Wed, 14 Dec 2016 23:08:20 +0900
From:   Alexandre Courbot <acourbot@...dia.com>
To:     Matthew Wilcox <willy@...ux.intel.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        <linux-next@...r.kernel.org>
Subject: Re: Issue with DRM and "reimplement IDR and IDA using the radix tree"

Forgot to add the most relevant list for this issue (linux-next).

Stephen, maybe you will want to temporarily revert this patch until this
is cleared? This probably affects other users than DRM.

On 12/13/2016 04:14 PM, Alexandre Courbot wrote:
> Hi Matthew,
> 
> Trying the latest -next on the Jetson TK1 board (with two different DRM
> devices and display and render), I noticed that the GPU device probe
> always failed with error -ENOSPC. After investigating I figured out that
> this was due to the minor device allocation failing when a second DRM
> device is added.
> 
> More precisely, when drm_minor_alloc() is called with DRM_MINOR_PRIMARY
> (0) as argument for a second time, the call to idr_alloc() (which has a
> requested range of 0..64) fails instead of returning 1 as expected. Note
> that the first call is successful.
> 
> Reverting "reimplement IDR and IDA using the radix tree" on 20161213's
> next fixes the issue for me, suggesting a bug may have slipped in there.
> 
> Not sure how this could be fixed, so reporting the issue for now in case
> it is not known yet.
> 
> Cheers,
> Alex.
> _______________________________________________
> dri-devel mailing list
> dri-devel@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel
> 

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