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remoteproc: Properly deal with a stop request when attached

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Allow a remote processor that was started by another entity to be
switched off by the remoteproc core.  For that to happen a
rproc::ops::stop() operation needs to be available.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@st.com>
Link: https://lore.kernel.org/r/20210312162453.1234145-16-mathieu.poirier@linaro.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
This commit is contained in:
Mathieu Poirier 2021-03-12 09:24:51 -07:00 committed by Bjorn Andersson
parent 83d4e6712c
commit d2008a9683
3 changed files with 8 additions and 2 deletions
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3
drivers/remoteproc/remoteproc_cdev.c
View File

@ -38,7 +38,8 @@ 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);

4
drivers/remoteproc/remoteproc_core.c
View File

@ -1802,6 +1802,10 @@ 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);

3
drivers/remoteproc/remoteproc_sysfs.c
View File

@ -202,7 +202,8 @@ 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);