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[v6,8/9] remoteproc: Refactor function rproc_free_vring()

Message ID 20200714195035.1426873-9-mathieu.poirier@linaro.org
State Mainlined
Commit 4d3ebb3b99905e0e1c83b320764495f5fc3f93fe
Headers show
Series remoteproc: Add support for attaching with rproc | expand

Commit Message

Mathieu Poirier July 14, 2020, 7:50 p.m. UTC
When function rproc_free_vring() clears the virtio device section
it does so on the cached resource table rather than the one
installed in the remote processor memory.  When a remote processor
has been booted by another entity there is no need to use a cached
table and as such, no need to clear the virtio device section in
it.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
---
 drivers/remoteproc/remoteproc_core.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 08de81828e4e..6b6e4ec8cf3a 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -410,10 +410,22 @@  void rproc_free_vring(struct rproc_vring *rvring)
 
 	idr_remove(&rproc->notifyids, rvring->notifyid);
 
-	/* reset resource entry info */
-	rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset;
-	rsc->vring[idx].da = 0;
-	rsc->vring[idx].notifyid = -1;
+	/*
+	 * At this point rproc_stop() has been called and the installed resource
+	 * table in the remote processor memory may no longer be accessible. As
+	 * such and as per rproc_stop(), rproc->table_ptr points to the cached
+	 * resource table (rproc->cached_table).  The cached resource table is
+	 * only available when a remote processor has been booted by the
+	 * remoteproc core, otherwise it is NULL.
+	 *
+	 * Based on the above, reset the virtio device section in the cached
+	 * resource table only if there is one to work with.
+	 */
+	if (rproc->table_ptr) {
+		rsc = (void *)rproc->table_ptr + rvring->rvdev->rsc_offset;
+		rsc->vring[idx].da = 0;
+		rsc->vring[idx].notifyid = -1;
+	}
 }
 
 static int rproc_vdev_do_start(struct rproc_subdev *subdev)