drm/v3d: Ensure job pointer is set to NULL after job completion

BugLink: https://bugs.launchpad.net/bugs/2107449

[ Upstream commit e4b5ccd ]

After a job completes, the corresponding pointer in the device must
be set to NULL. Failing to do so triggers a warning when unloading
the driver, as it appears the job is still active. To prevent this,
assign the job pointer to NULL after completing the job, indicating
the job has finished.

Fixes: 14d1d19 ("drm/v3d: Remove the bad signaled() implementation.")
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Reviewed-by: Jose Maria Casanova Crespo <jmcasanova@igalia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250113154741.67520-1-mcanal@igalia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
CVE-2025-21697
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

Author: mairacanal

drivers/gpu/drm/v3d/v3d_irq.c

@@ -118,6 +118,7 @@ v3d_irq(int irq, void *arg)
 
 		trace_v3d_bcl_irq(&v3d->drm, fence->seqno);
 		dma_fence_signal(&fence->base);
+		v3d->bin_job = NULL;
 		status = IRQ_HANDLED;
 	}
 
@@ -138,6 +139,7 @@ v3d_irq(int irq, void *arg)
 
 		trace_v3d_rcl_irq(&v3d->drm, fence->seqno);
 		dma_fence_signal(&fence->base);
+		v3d->render_job = NULL;
 		status = IRQ_HANDLED;
 	}
 
@@ -158,6 +160,7 @@ v3d_irq(int irq, void *arg)
 
 		trace_v3d_csd_irq(&v3d->drm, fence->seqno);
 		dma_fence_signal(&fence->base);
+		v3d->csd_job = NULL;
 		status = IRQ_HANDLED;
 	}
 
@@ -205,6 +208,7 @@ v3d_hub_irq(int irq, void *arg)
 
 		trace_v3d_tfu_irq(&v3d->drm, fence->seqno);
 		dma_fence_signal(&fence->base);
+		v3d->tfu_job = NULL;
 		status = IRQ_HANDLED;
 	}