On Wed, 23 Mar 2022 at 03:42, Shengjiu Wang <shengjiu.wang@xxxxxxx> wrote:
>
> 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@xxxxxxx>
> ---
> 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;
> -
As per my previous comment the above conditions need to be moved into
rproc_boot().
> 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;
> -
This patch should have been part of a patch series with your other
work sent on March 18th[1].
Thanks,
Mathieu
[1]. [PATCH] remoteproc: core: check rproc->power value before decreasing it
> ret = rproc_detach(rproc);
> } else {
> dev_err(&rproc->dev, "Unrecognised option: %s\n", buf);
> --
> 2.17.1
>
