linux-kernel - [PATCH v6 16/16] remoteproc: Refactor rproc delete and cdev release path

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Date:   Tue, 23 Feb 2021 16:35:15 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org,
        arnaud.pouliquen@...com
Cc:     mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v6 16/16] remoteproc: Refactor rproc delete and cdev release path

Refactor function rproc_del() and rproc_cdev_release() to take
into account the current state of the remote processor when choosing
the state to transition to.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
New for V6:
- The RPROC_RUNNING -> RPROC_DETACHED transition is no longer permitted.
  to avoid dealing with complex resource table management problems.
- Transition to the next state is no longer dictated by a DT binding for
  the same reason as above.
- Removed Peng and Arnaud's RB tags because of the above.
---

 drivers/remoteproc/remoteproc_cdev.c | 10 ++++++++--
 drivers/remoteproc/remoteproc_core.c |  9 +++++++--
 2 files changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index 2db494816d5f..0b8a84c04f76 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -86,11 +86,17 @@ static long rproc_device_ioctl(struct file *filp, unsigned int ioctl, unsigned l
 static int rproc_cdev_release(struct inode *inode, struct file *filp)
 {
 	struct rproc *rproc = container_of(inode->i_cdev, struct rproc, cdev);
+	int ret = 0;
+
+	if (!rproc->cdev_put_on_release)
+		return 0;
 
-	if (rproc->cdev_put_on_release && rproc->state == RPROC_RUNNING)
+	if (rproc->state == RPROC_RUNNING)
 		rproc_shutdown(rproc);
+	else if (rproc->state == RPROC_ATTACHED)
+		ret = rproc_detach(rproc);
 
-	return 0;
+	return ret;
 }
 
 static const struct file_operations rproc_fops = {
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 00452da25fba..a05d5fec43b1 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -2542,11 +2542,16 @@ EXPORT_SYMBOL(rproc_put);
  */
 int rproc_del(struct rproc *rproc)
 {
+	int ret = 0;
+
 	if (!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)
+		ret = rproc_detach(rproc);
 
 	mutex_lock(&rproc->lock);
 	rproc->state = RPROC_DELETED;
@@ -2565,7 +2570,7 @@ int rproc_del(struct rproc *rproc)
 
 	device_del(&rproc->dev);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL(rproc_del);
 
-- 
2.25.1