linux-kernel - RE: [PATCH 10/13] remoteproc: Properly deal with a stop request when attached

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Date:   Thu, 15 Oct 2020 02:29:24 +0000
From:   Peng Fan <peng.fan@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        "bjorn.andersson@...aro.org" <bjorn.andersson@...aro.org>,
        "ohad@...ery.com" <ohad@...ery.com>
CC:     "linux-remoteproc@...r.kernel.org" <linux-remoteproc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 10/13] remoteproc: Properly deal with a stop request when
 attached

> Subject: [PATCH 10/13] remoteproc: Properly deal with a stop request when
> attached
> 
> This patch introduces the capability to stop a remote processor that has been
> attached to by the remoteproc core.  For that to happen a rproc::ops::stop()
> operation need to be available.
> 
> Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
> ---
>  drivers/remoteproc/remoteproc_cdev.c  | 5 +++--
> drivers/remoteproc/remoteproc_core.c  | 6 +++++-
> drivers/remoteproc/remoteproc_sysfs.c | 5 +++--
>  3 files changed, 11 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_cdev.c
> b/drivers/remoteproc/remoteproc_cdev.c
> index b19ea3057bde..d06f8d4919c7 100644
> --- a/drivers/remoteproc/remoteproc_cdev.c
> +++ b/drivers/remoteproc/remoteproc_cdev.c
> @@ -37,10 +37,11 @@ static ssize_t rproc_cdev_write(struct file *filp, const
> char __user *buf, size_
> 
>  		ret = rproc_boot(rproc);
>  	} else if (!strncmp(cmd, "stop", len)) {
> -		if (rproc->state != RPROC_RUNNING)
> +		if (rproc->state != RPROC_RUNNING &&
> +		    rproc->state != RPROC_ATTACHED)
>  			return -EINVAL;
> 
> -		rproc_shutdown(rproc);
> +		ret = rproc_shutdown(rproc);
>  	} else {
>  		dev_err(&rproc->dev, "Unrecognized option\n");
>  		ret = -EINVAL;
> diff --git a/drivers/remoteproc/remoteproc_core.c
> b/drivers/remoteproc/remoteproc_core.c
> index c6c6aba66098..95bb40b4ebb3 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1619,6 +1619,10 @@ static int rproc_stop(struct rproc *rproc, bool
> crashed)
>  	struct device *dev = &rproc->dev;
>  	int ret;
> 
> +	/* No need to continue if a stop() operation has not been provided */
> +	if (!rproc->ops->stop)
> +		return -EINVAL;
> +
>  	/* Stop any subdevices for the remote processor */
>  	rproc_stop_subdevices(rproc, crashed);
> 
> @@ -1857,7 +1861,7 @@ int rproc_shutdown(struct rproc *rproc)
>  		return ret;
>  	}
> 
> -	if (rproc->state != RPROC_RUNNING) {
> +	if (rproc->state != RPROC_RUNNING && rproc->state !=
> RPROC_ATTACHED) {
>  		ret = -EPERM;
>  		goto out;
>  	}
> diff --git a/drivers/remoteproc/remoteproc_sysfs.c
> b/drivers/remoteproc/remoteproc_sysfs.c
> index c152d11a4d3c..6134d2f083ce 100644
> --- a/drivers/remoteproc/remoteproc_sysfs.c
> +++ b/drivers/remoteproc/remoteproc_sysfs.c
> @@ -113,10 +113,11 @@ static ssize_t state_store(struct device *dev,
>  		if (ret)
>  			dev_err(&rproc->dev, "Boot failed: %d\n", ret);
>  	} else if (sysfs_streq(buf, "stop")) {
> -		if (rproc->state != RPROC_RUNNING)
> +		if (rproc->state != RPROC_RUNNING &&
> +		    rproc->state != RPROC_ATTACHED)
>  			return -EINVAL;
> 
> -		rproc_shutdown(rproc);
> +		ret = rproc_shutdown(rproc);
>  	} else {
>  		dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
>  		ret = -EINVAL;
> --

Reviewed-by: Peng Fan <peng.fan@....com>