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From:   Shengjiu Wang <shengjiu.wang@nxp.com>
To:     bjorn.andersson@linaro.org, mathieu.poirier@linaro.org
Cc:     linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
        shengjiu.wang@gmail.com
Subject: [PATCH] remoteproc: core: Remove state checking before changing state
Date:   Wed, 23 Mar 2022 17:32:50 +0800
Message-Id: <1648027970-11488-1-git-send-email-shengjiu.wang@nxp.com>
Precedence: bulk

There is no mutex protecting of these state checking, which
can't garantee there is no another instance is trying to do
same operation.

The reference counter rproc->power is used to manage state
changing and there is mutex protection in each operation
function for multi instance case.

So remove this state checking in rproc_cdev_write() and
state_store(), just let reference counter rproc->power to
manage the behaviors.

Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 drivers/remoteproc/remoteproc_cdev.c  | 11 -----------
 drivers/remoteproc/remoteproc_sysfs.c | 11 -----------
 2 files changed, 22 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index 906ff3c4dfdd..687f205fd70a 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -32,21 +32,10 @@ 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 ||
-		    rproc->state == RPROC_ATTACHED)
-			return -EBUSY;
-
 		ret = rproc_boot(rproc);
 	} else if (!strncmp(cmd, "stop", len)) {
-		if (rproc->state != RPROC_RUNNING &&
-		    rproc->state != RPROC_ATTACHED)
-			return -EINVAL;
-
 		ret = rproc_shutdown(rproc);
 	} else if (!strncmp(cmd, "detach", len)) {
-		if (rproc->state != RPROC_ATTACHED)
-			return -EINVAL;
-
 		ret = rproc_detach(rproc);
 	} else {
 		dev_err(&rproc->dev, "Unrecognized option\n");
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index 51a04bc6ba7a..8c7ea8922638 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -194,23 +194,12 @@ static ssize_t state_store(struct device *dev,
 	int ret = 0;
 
 	if (sysfs_streq(buf, "start")) {
-		if (rproc->state == RPROC_RUNNING ||
-		    rproc->state == RPROC_ATTACHED)
-			return -EBUSY;
-
 		ret = rproc_boot(rproc);
 		if (ret)
 			dev_err(&rproc->dev, "Boot failed: %d\n", ret);
 	} else if (sysfs_streq(buf, "stop")) {
-		if (rproc->state != RPROC_RUNNING &&
-		    rproc->state != RPROC_ATTACHED)
-			return -EINVAL;
-
 		ret = rproc_shutdown(rproc);
 	} else if (sysfs_streq(buf, "detach")) {
-		if (rproc->state != RPROC_ATTACHED)
-			return -EINVAL;
-
 		ret = rproc_detach(rproc);
 	} else {
 		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
-- 
2.17.1