linux-kernel - [PATCH v5 17/19] remoteproc: Properly deal with a start request when attached

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Date:   Thu, 11 Feb 2021 16:46:25 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     ohad@...ery.com, bjorn.andersson@...aro.org,
        arnaud.pouliquen@...com
Cc:     robh+dt@...nel.org, mcoquelin.stm32@...il.com,
        alexandre.torgue@...com, linux-remoteproc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v5 17/19] remoteproc: Properly deal with a start request when attached

This patch takes into account scenarios where a remote processor
has been attached to when receiving a "start" command from sysfs.

As with the "running" case, the command can't be carried out if the
remote processor is already in operation.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@...com>
---
 drivers/remoteproc/remoteproc_cdev.c  | 3 ++-
 drivers/remoteproc/remoteproc_sysfs.c | 3 ++-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index d06f8d4919c7..61541bc7d26c 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -32,7 +32,8 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_
 		return -EFAULT;
 
 	if (!strncmp(cmd, "start", len)) {
-		if (rproc->state == RPROC_RUNNING)
+		if (rproc->state == RPROC_RUNNING ||
+		    rproc->state == RPROC_ATTACHED)
 			return -EBUSY;
 
 		ret = rproc_boot(rproc);
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 3696f2ccc785..7d281cfe3e03 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -194,7 +194,8 @@ static ssize_t state_store(struct device *dev,
 	int ret = 0;
 
 	if (sysfs_streq(buf, "start")) {
-		if (rproc->state == RPROC_RUNNING)
+		if (rproc->state == RPROC_RUNNING ||
+		    rproc->state == RPROC_ATTACHED)
 			return -EBUSY;
 
 		ret = rproc_boot(rproc);
-- 
2.25.1