linux-kernel - Re: [PATCH] drm/nouveau/dmem: missing mutex

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Date:   Fri, 14 Jun 2019 00:24:04 +0000
From:   Jason Gunthorpe <jgg@...lanox.com>
To:     Ralph Campbell <rcampbell@...dia.com>
CC:     Jerome Glisse <jglisse@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Ben Skeggs <bskeggs@...hat.com>,
        "nouveau@...ts.freedesktop.org" <nouveau@...ts.freedesktop.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/nouveau/dmem: missing mutex_lock in error path

On Thu, Jun 13, 2019 at 05:11:21PM -0700, Ralph Campbell wrote:
> In nouveau_dmem_pages_alloc(), the drm->dmem->mutex is unlocked before
> calling nouveau_dmem_chunk_alloc().
> Reacquire the lock before continuing to the next page.
> 
> Signed-off-by: Ralph Campbell <rcampbell@...dia.com>
> ---
> 
> I found this while testing Jason Gunthorpe's hmm tree but this is
> independant of those changes. I guess it could go through
> David Airlie's tree for nouveau or Jason's tree.

This seems like a bad enough bug to send it into -rc?

It probably should go through the normal nouveau channels, thanks

Jason