This is a note to let you know that I've just added the patch titled
remoteproc: stm32_rproc: Add mutex protection for workqueue
to the 5.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
remoteproc-stm32_rproc-add-mutex-protection-for-work.patch
and it can be found in the queue-5.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 83d1fe186a86fd374115618892ff960304156692
Author: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx>
Date: Fri Mar 31 18:06:34 2023 +0200
remoteproc: stm32_rproc: Add mutex protection for workqueue
[ Upstream commit 35bdafda40cc343ad2ba2cce105eba03a70241cc ]
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@xxxxxxxxxx>
Signed-off-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230331160634.3113031-1-arnaud.pouliquen@xxxxxxxxxxx
Signed-off-by: Mathieu Poirier <mathieu.poirier@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/remoteproc/stm32_rproc.c b/drivers/remoteproc/stm32_rproc.c
index 24760d8ea6374..df784fec124f6 100644
--- a/drivers/remoteproc/stm32_rproc.c
+++ b/drivers/remoteproc/stm32_rproc.c
@@ -301,8 +301,16 @@ 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)
