From: Arnaud Pouliquen <arnaud.pouliquen@xxxxxxxxxxx> [ 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> --- 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 7d782ed9e5896..f618405cf4200 100644 --- a/drivers/remoteproc/stm32_rproc.c +++ b/drivers/remoteproc/stm32_rproc.c @@ -287,8 +287,16 @@ 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) -- 2.39.2
