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remoteproc: stm32_rproc: Add mutex protection for workqueue

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The workqueue may execute late even after remoteproc is stopped or
stopping, some resources (rpmsg device and endpoint) have been
released in rproc_stop_subdevices(), then rproc_vq_interrupt()
accessing these resources will cause kernel dump.

Call trace:
virtqueue_add_inbuf
virtqueue_add_inbuf
rpmsg_recv_single
rpmsg_recv_done
vring_interrupt
stm32_rproc_mb_vq_work
process_one_work
worker_thread
kthread

Suggested-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@foss.st.com>
Link: https://lore.kernel.org/r/20230331160634.3113031-1-arnaud.pouliquen@foss.st.com
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
This commit is contained in:
Arnaud Pouliquen 2023-03-31 18:06:34 +02:00 committed by Mathieu Poirier
parent 8666071391
commit 35bdafda40
1 changed files with 8 additions and 0 deletions
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8
drivers/remoteproc/stm32_rproc.c
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@ -291,8 +291,16 @@ static void stm32_rproc_mb_vq_work(struct work_struct *work)
struct stm32_mbox *mb = container_of(work, struct stm32_mbox, vq_work);
struct rproc *rproc = dev_get_drvdata(mb->client.dev);
mutex_lock(&rproc->lock);
if (rproc->state != RPROC_RUNNING)
goto unlock_mutex;
if (rproc_vq_interrupt(rproc, mb->vq_id) == IRQ_NONE)
dev_dbg(&rproc->dev, "no message found in vq%d\n", mb->vq_id);
unlock_mutex:
mutex_unlock(&rproc->lock);
}
static void stm32_rproc_mb_callback(struct mbox_client *cl, void *data)