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From: Jeremy Cline <jcline@redhat.com>
To: Ben Skeggs <bskeggs@redhat.com>
Cc: Karol Herbst <kherbst@redhat.com>,
	David Airlie <airlied@linux.ie>,
	nouveau@lists.freedesktop.org, linux-kernel@vger.kernel.org,
	dri-devel@lists.freedesktop.org, Jeremy Cline <jcline@redhat.com>,
	stable@vger.kernel.org
Subject: [PATCH v2 1/3] drm/nouveau: use drm_dev_unplug() during device removal
Date: Wed, 25 Nov 2020 15:26:46 -0500	[thread overview]
Message-ID: <20201125202648.5220-2-jcline@redhat.com> (raw)
In-Reply-To: <20201125202648.5220-1-jcline@redhat.com>

Nouveau does not currently support hot-unplugging, but it still makes
sense to switch from drm_dev_unregister() to drm_dev_unplug().
drm_dev_unplug() calls drm_dev_unregister() after marking the device as
unplugged, but only after any device critical sections are finished.

Since nouveau isn't using drm_dev_enter() and drm_dev_exit(), there are
no critical sections so this is nearly functionally equivalent. However,
the DRM layer does check to see if the device is unplugged, and if it is
returns appropriate error codes.

In the future nouveau can add critical sections in order to truly
support hot-unplugging.

Cc: stable@vger.kernel.org
Signed-off-by: Jeremy Cline <jcline@redhat.com>
---
 drivers/gpu/drm/nouveau/nouveau_drm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index d141a5f004af..4fe4d664c5f2 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -792,7 +792,7 @@ nouveau_drm_device_remove(struct drm_device *dev)
 	struct nvkm_client *client;
 	struct nvkm_device *device;
 
-	drm_dev_unregister(dev);
+	drm_dev_unplug(dev);
 
 	dev->irq_enabled = false;
 	client = nvxx_client(&drm->client.base);
-- 
2.28.0

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  reply	other threads:[~2020-11-25 20:27 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-03 19:49 [PATCH 0/3] drm/nouveau: fix a use-after-free in postclose() Jeremy Cline
2020-11-03 19:49 ` [PATCH 1/3] drm/nouveau: use drm_dev_unplug() during device removal Jeremy Cline
2020-11-03 19:49 ` [PATCH 2/3] drm/nouveau: Add a dedicated mutex for the clients list Jeremy Cline
2020-11-25 18:37   ` Lyude Paul
2020-11-25 19:45     ` Jeremy Cline
2020-11-03 19:49 ` [PATCH 3/3] drm/nouveau: clean up all clients on device removal Jeremy Cline
2020-11-25 18:44   ` Lyude Paul
2020-11-25 20:26 ` [PATCH v2 0/3] drm/nouveau: fix a use-after-free in postclose() Jeremy Cline
2020-11-25 20:26   ` Jeremy Cline [this message]
2020-11-25 20:26   ` [PATCH v2 2/3] drm/nouveau: Add a dedicated mutex for the clients list Jeremy Cline
2020-11-25 20:26   ` [PATCH v2 3/3] drm/nouveau: clean up all clients on device removal Jeremy Cline
2021-03-26 22:00   ` [PATCH v2 0/3] drm/nouveau: fix a use-after-free in postclose() Lyude Paul
2021-08-16  7:03     ` Salvatore Bonaccorso
2021-08-17 20:32       ` Lyude Paul
2021-10-11  7:05         ` Salvatore Bonaccorso
2021-10-11 11:05           ` Karol Herbst

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