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authorMathieu Poirier <mathieu.poirier@linaro.org>2021-03-12 09:24:51 -0700
committerBjorn Andersson <bjorn.andersson@linaro.org>2021-03-18 08:02:09 -0500
commitd2008a96833082713094ba8a545141be1b01b266 (patch)
treebfc8ddac634d4047488e12bc0410c43c34299c1e /drivers/remoteproc
parent83d4e6712c3b1a7dd5b43251737ea3d7d0a460f4 (diff)
downloadlinux-d2008a96833082713094ba8a545141be1b01b266.tar.bz2
remoteproc: Properly deal with a stop request when attached
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>
Diffstat (limited to 'drivers/remoteproc')
-rw-r--r--drivers/remoteproc/remoteproc_cdev.c3
-rw-r--r--drivers/remoteproc/remoteproc_core.c4
-rw-r--r--drivers/remoteproc/remoteproc_sysfs.c3
3 files changed, 8 insertions, 2 deletions
diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c
index b2cee9afb41b..0249d8f6c3f8 100644
--- a/drivers/remoteproc/remoteproc_cdev.c
+++ b/drivers/remoteproc/remoteproc_cdev.c
@@ -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);
diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 4cf6ef7e15b5..626a6b90fba2 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -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);
diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c
index bbfa238e4707..23c0dc1ddc34 100644
--- a/drivers/remoteproc/remoteproc_sysfs.c
+++ b/drivers/remoteproc/remoteproc_sysfs.c
@@ -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);