linux-kernel - [PATCH 1/4] drm/v3d: Add a note about OOM vs FRDONE, which may be racing on v3.3.

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Message-Id: <20190313235211.28995-1-eric@anholt.net>
Date:   Wed, 13 Mar 2019 16:52:08 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, david.emett@...adcom.com,
        thomas.spurden@...adcom.com, Eric Anholt <eric@...olt.net>
Subject: [PATCH 1/4] drm/v3d: Add a note about OOM vs FRDONE, which may be racing on v3.3.

We deref v3d->bin_job in the work handler, but v3d->bin_job doesn't
actually hold a ref on the job.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/v3d/v3d_irq.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/v3d/v3d_irq.c b/drivers/gpu/drm/v3d/v3d_irq.c
index b4d6ae81186d..a09442ec7297 100644
--- a/drivers/gpu/drm/v3d/v3d_irq.c
+++ b/drivers/gpu/drm/v3d/v3d_irq.c
@@ -87,7 +87,8 @@ v3d_irq(int irq, void *arg)
 	if (intsts & V3D_INT_OUTOMEM) {
 		/* Note that the OOM status is edge signaled, so the
 		 * interrupt won't happen again until the we actually
-		 * add more memory.
+		 * add more memory.  Also, as of V3D 4.1, FRDONE won't
+		 * be reported until any OOM state has been cleared.
 		 */
 		schedule_work(&v3d->overflow_mem_work);
 		status = IRQ_HANDLED;
-- 
2.20.1