linux-kernel - [PATCH 12/13] remoteproc: Refactor rproc delete and cdev release path

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Date:   Wed, 26 Aug 2020 10:45:28 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     bjorn.andersson@...aro.org, ohad@...ery.com
Cc:     linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 12/13] remoteproc: Refactor rproc delete and cdev release path

Refactor function rproc_del() and rproc_cdev_release() to take
into account scenarios where the remote processor has been
attached to.  If the remote processor has been started by the
remoteproc core then switch it off, and if it was attached to
detach from it. This heuristic is simple and can be enhanced
easily if there is a need to.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 drivers/remoteproc/remoteproc_cdev.c | 7 ++++++-
 drivers/remoteproc/remoteproc_core.c | 5 ++++-
 2 files changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index 3a3830e27050..18cffbe588c1 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -87,8 +87,13 @@ static int rproc_cdev_release(struct inode *inode, struct file *filp)
 {
 	struct rproc *rproc = container_of(inode->i_cdev, struct rproc, cdev);
 
-	if (rproc->cdev_put_on_release && rproc->state == RPROC_RUNNING)
+	if (!rproc->cdev_put_on_release)
+		return 0;
+
+	if (rproc->state == RPROC_RUNNING)
 		rproc_shutdown(rproc);
+	else if (rproc->state == RPROC_ATTACHED)
+		rproc_detach(rproc);
 
 	return 0;
 }
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 95bb40b4ebb3..5586582f54c5 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2346,7 +2346,10 @@ int rproc_del(struct rproc *rproc)
 		return -EINVAL;
 
 	/* TODO: make sure this works with rproc->power > 1 */
-	rproc_shutdown(rproc);
+	if (rproc->state == RPROC_RUNNING)
+		rproc_shutdown(rproc);
+	else if (rproc->state == RPROC_ATTACHED)
+		rproc_detach(rproc);
 
 	mutex_lock(&rproc->lock);
 	rproc->state = RPROC_DELETED;
-- 
2.25.1