From: Arnaud Pouliquen arnaud.pouliquen@foss.st.com
[ 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@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.... Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/remoteproc/stm32_rproc.c | 8 ++++++++ 1 file changed, 8 insertions(+)
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)