linux-kernel - [PATCH V3] remoteproc: virtio: Fix wdg cannot recovery remote processor

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Date: Sun, 17 Dec 2023 13:36:59 +0800
From: joakim.zhang@...tech.com
To: andersson@...nel.org,
	mathieu.poirier@...aro.org,
	arnaud.pouliquen@...s.st.com
Cc: linux-remoteproc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	cix-kernel-upstream@...tech.com,
	Joakim Zhang <joakim.zhang@...tech.com>
Subject: [PATCH V3] remoteproc: virtio: Fix wdg cannot recovery remote processor

From: Joakim Zhang <joakim.zhang@...tech.com>

Recovery remote processor failed when wdg irq received:
[    0.842574] remoteproc remoteproc0: crash detected in cix-dsp-rproc: type watchdog
[    0.842750] remoteproc remoteproc0: handling crash #1 in cix-dsp-rproc
[    0.842824] remoteproc remoteproc0: recovering cix-dsp-rproc
[    0.843342] remoteproc remoteproc0: stopped remote processor cix-dsp-rproc
[    0.847901] rproc-virtio rproc-virtio.0.auto: Failed to associate buffer
[    0.847979] remoteproc remoteproc0: failed to probe subdevices for cix-dsp-rproc: -16

The reason is that dma coherent mem would not be released when
recovering the remote processor, due to rproc_virtio_remove()
would not be called, where the mem released. It will fail when
it try to allocate and associate buffer again.

Releasing reserved memory from rproc_virtio_dev_release(), instead of
rproc_virtio_remove().

Fixes: 1d7b61c06dc3 ("remoteproc: virtio: Create platform device for the remoteproc_virtio")
Signed-off-by: Joakim Zhang <joakim.zhang@...tech.com>
---
ChangeLogs:
V1->V2:
	* the same for of_reserved_mem_device_release()
V2->V3:
	* release reserved memory in rproc_virtio_dev_release()
---
 drivers/remoteproc/remoteproc_virtio.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_virtio.c b/drivers/remoteproc/remoteproc_virtio.c
index 83d76915a6ad..25b66b113b69 100644
--- a/drivers/remoteproc/remoteproc_virtio.c
+++ b/drivers/remoteproc/remoteproc_virtio.c
@@ -351,6 +351,9 @@ static void rproc_virtio_dev_release(struct device *dev)
 
 	kfree(vdev);
 
+	of_reserved_mem_device_release(&rvdev->pdev->dev);
+	dma_release_coherent_memory(&rvdev->pdev->dev);
+
 	put_device(&rvdev->pdev->dev);
 }
 
@@ -584,9 +587,6 @@ static void rproc_virtio_remove(struct platform_device *pdev)
 	rproc_remove_subdev(rproc, &rvdev->subdev);
 	rproc_remove_rvdev(rvdev);
 
-	of_reserved_mem_device_release(&pdev->dev);
-	dma_release_coherent_memory(&pdev->dev);
-
 	put_device(&rproc->dev);
 }
 
-- 
2.25.1