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

Mathieu Poirier
2020-08-26T16:48:20Z

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@linaro.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;
--
2.25.1