[PATCH 6.11 304/817] drm: zynqmp_kms: Unplug DRM device before removal

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6.11-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sean Anderson <sean.anderson@xxxxxxxxx>

[ Upstream commit 2e07c88914fc5289c21820b1aa94f058feb38197 ]

Prevent userspace accesses to the DRM device from causing
use-after-frees by unplugging the device before we remove it. This
causes any further userspace accesses to result in an error without
further calls into this driver's internals.

Fixes: d76271d22694 ("drm: xlnx: DRM/KMS driver for Xilinx ZynqMP DisplayPort Subsystem")
Closes: https://lore.kernel.org/dri-devel/4d8f4c9b-2efb-4774-9a37-2f257f79b2c9@xxxxxxxxx/
Signed-off-by: Sean Anderson <sean.anderson@xxxxxxxxx>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20240809193600.3360015-2-sean.anderson@xxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/gpu/drm/xlnx/zynqmp_kms.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/xlnx/zynqmp_kms.c b/drivers/gpu/drm/xlnx/zynqmp_kms.c
index bd1368df78703..4556af2faa0f1 100644
--- a/drivers/gpu/drm/xlnx/zynqmp_kms.c
+++ b/drivers/gpu/drm/xlnx/zynqmp_kms.c
@@ -536,7 +536,7 @@ void zynqmp_dpsub_drm_cleanup(struct zynqmp_dpsub *dpsub)
 {
 	struct drm_device *drm = &dpsub->drm->dev;
 
-	drm_dev_unregister(drm);
+	drm_dev_unplug(drm);
 	drm_atomic_helper_shutdown(drm);
 	drm_encoder_cleanup(&dpsub->drm->encoder);
 	drm_kms_helper_poll_fini(drm);
-- 
2.43.0







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