From: "Christian König" <christian.koenig@amd.com>
To: "Dmitry Osipenko" <dmitry.osipenko@collabora.com>,
"David Airlie" <airlied@linux.ie>,
"Gerd Hoffmann" <kraxel@redhat.com>,
"Gurchetan Singh" <gurchetansingh@chromium.org>,
"Chia-I Wu" <olvaffe@gmail.com>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Emil Velikov" <emil.l.velikov@gmail.com>,
"Thomas Hellström" <thomas_os@shipmail.org>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
"Dmitry Osipenko" <digetx@gmail.com>,
linux-tegra@vger.kernel.org, kernel@collabora.com,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH v8 1/2] drm/gem: Properly annotate WW context on drm_gem_lock_reservations() error
Date: Wed, 10 Aug 2022 08:52:18 +0200 [thread overview]
Message-ID: <e760f555-7f2d-dea9-70b2-c0881adc3afc@amd.com> (raw)
In-Reply-To: <YvKO5r5Sr56e9vBf@phenom.ffwll.local>
Am 09.08.22 um 18:44 schrieb Daniel Vetter:
> On Tue, Jul 05, 2022 at 01:33:51PM +0200, Christian König wrote:
>> Am 01.07.22 um 11:02 schrieb Dmitry Osipenko:
>>> Use ww_acquire_fini() in the error code paths. Otherwise lockdep
>>> thinks that lock is held when lock's memory is freed after the
>>> drm_gem_lock_reservations() error. The ww_acquire_context needs to be
>>> annotated as "released", which fixes the noisy "WARNING: held lock freed!"
>>> splat of VirtIO-GPU driver with CONFIG_DEBUG_MUTEXES=y and enabled lockdep.
>>>
>>> Cc: stable@vger.kernel.org
>>> Fixes: 7edc3e3b975b5 ("drm: Add helpers for locking an array of BO reservations.")
>>> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
>>> Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
>> Reviewed-by: Christian König <christian.koenig@amd.com>
> Also added this r-b tag when merging to drm-misc-next-fixes.
IIRC I've already pushed this to drm-misc-fixes with a CC stable tag
about 2 weeks ago.
Please double check, it probably just hasn't come down the stream again yet.
Christian.
> -Daniel
>
>>> ---
>>> drivers/gpu/drm/drm_gem.c | 4 ++--
>>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>>
>>> diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
>>> index eb0c2d041f13..86d670c71286 100644
>>> --- a/drivers/gpu/drm/drm_gem.c
>>> +++ b/drivers/gpu/drm/drm_gem.c
>>> @@ -1226,7 +1226,7 @@ drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
>>> ret = dma_resv_lock_slow_interruptible(obj->resv,
>>> acquire_ctx);
>>> if (ret) {
>>> - ww_acquire_done(acquire_ctx);
>>> + ww_acquire_fini(acquire_ctx);
>>> return ret;
>>> }
>>> }
>>> @@ -1251,7 +1251,7 @@ drm_gem_lock_reservations(struct drm_gem_object **objs, int count,
>>> goto retry;
>>> }
>>> - ww_acquire_done(acquire_ctx);
>>> + ww_acquire_fini(acquire_ctx);
>>> return ret;
>>> }
>>> }
next prev parent reply other threads:[~2022-08-10 6:52 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-01 9:02 [PATCH v8 0/2] DRM GEM fixes Dmitry Osipenko
2022-07-01 9:02 ` [PATCH v8 1/2] drm/gem: Properly annotate WW context on drm_gem_lock_reservations() error Dmitry Osipenko
2022-07-05 11:33 ` Christian König
2022-08-09 16:44 ` Daniel Vetter
2022-08-10 6:52 ` Christian König [this message]
2022-08-10 8:33 ` Daniel Vetter
2022-08-10 9:04 ` Christian König
2022-07-01 9:02 ` [PATCH v8 2/2] drm/gem: Don't map imported GEMs Dmitry Osipenko
2022-07-05 11:39 ` Christian König
2022-07-05 21:48 ` Rob Clark
2022-07-06 7:02 ` Dmitry Osipenko
2022-08-10 11:47 ` Daniel Vetter
2022-08-10 15:08 ` Rob Clark
2022-08-10 19:26 ` Dmitry Osipenko
2022-08-10 22:03 ` Rob Clark
2022-08-10 22:23 ` Dmitry Osipenko
2022-08-10 23:19 ` Rob Clark
2022-08-12 11:26 ` Dmitry Osipenko
2022-08-12 14:57 ` Rob Clark
2022-08-12 15:01 ` Rob Clark
2022-08-16 11:44 ` Dmitry Osipenko
2022-08-16 11:52 ` Dmitry Osipenko
2022-08-16 12:03 ` Christian König
2022-08-16 19:55 ` Dmitry Osipenko
2022-08-22 17:26 ` Dmitry Osipenko
2022-08-23 10:01 ` Christian König
2022-08-23 16:47 ` Rob Clark
2022-09-07 10:25 ` Dmitry Osipenko
2022-09-11 18:00 ` Rob Clark
2022-08-16 22:18 ` Rob Clark
2022-08-10 19:27 ` Dmitry Osipenko
2022-07-22 11:49 ` [PATCH v8 0/2] DRM GEM fixes Dmitry Osipenko
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