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remoteproc: Change rproc_shutdown() to return a status

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The rproc_shutdown() function is currently not returning any
error code, and any failures within rproc_stop() are not passed
back to the users. Change the signature to return a success value
back to the callers.

The remoteproc sysfs and cdev interfaces are also updated to
return back this status to userspace.

Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Link: https://lore.kernel.org/r/20220213201246.25952-2-s-anna@ti.com
This commit is contained in:
Suman Anna 2022-02-13 14:12:42 -06:00 committed by Bjorn Andersson
parent 8d9be5c6bd
commit c13b780c45
5 changed files with 11 additions and 7 deletions
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3
Documentation/staging/remoteproc.rst
View File

@ -49,13 +49,14 @@ might also consider using dev_archdata for this).
::
void rproc_shutdown(struct rproc *rproc)
int rproc_shutdown(struct rproc *rproc)
Power off a remote processor (previously booted with rproc_boot()).
In case @rproc is still being used by an additional user(s), then
this function will just decrement the power refcount and exit,
without really powering off the device.
Returns 0 on success, and an appropriate error value otherwise.
Every call to rproc_boot() must (eventually) be accompanied by a call
to rproc_shutdown(). Calling rproc_shutdown() redundantly is a bug.

2
drivers/remoteproc/remoteproc_cdev.c
View File

@ -42,7 +42,7 @@ static ssize_t rproc_cdev_write(struct file *filp, const char __user *buf, size_
rproc->state != RPROC_ATTACHED)
return -EINVAL;
rproc_shutdown(rproc);
ret = rproc_shutdown(rproc);
} else if (!strncmp(cmd, "detach", len)) {
if (rproc->state != RPROC_ATTACHED)
return -EINVAL;

9
drivers/remoteproc/remoteproc_core.c
View File

@ -2061,16 +2061,18 @@ EXPORT_SYMBOL(rproc_boot);
* which means that the @rproc handle stays valid even after rproc_shutdown()
* returns, and users can still use it with a subsequent rproc_boot(), if
* needed.
*
* Return: 0 on success, and an appropriate error value otherwise
*/
void rproc_shutdown(struct rproc *rproc)
int rproc_shutdown(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
int ret = 0;
ret = mutex_lock_interruptible(&rproc->lock);
if (ret) {
dev_err(dev, "can't lock rproc %s: %d\n", rproc->name, ret);
return;
return ret;
}
/* if the remote proc is still needed, bail out */
@ -2097,6 +2099,7 @@ void rproc_shutdown(struct rproc *rproc)
rproc->table_ptr = NULL;
out:
mutex_unlock(&rproc->lock);
return ret;
}
EXPORT_SYMBOL(rproc_shutdown);

2
drivers/remoteproc/remoteproc_sysfs.c
View File

@ -206,7 +206,7 @@ static ssize_t state_store(struct device *dev,
rproc->state != RPROC_ATTACHED)
return -EINVAL;
rproc_shutdown(rproc);
ret = rproc_shutdown(rproc);
} else if (sysfs_streq(buf, "detach")) {
if (rproc->state != RPROC_ATTACHED)
return -EINVAL;

2
include/linux/remoteproc.h
View File

@ -671,7 +671,7 @@ rproc_of_resm_mem_entry_init(struct device *dev, u32 of_resm_idx, size_t len,
u32 da, const char *name, ...);
int rproc_boot(struct rproc *rproc);
void rproc_shutdown(struct rproc *rproc);
int rproc_shutdown(struct rproc *rproc);
int rproc_detach(struct rproc *rproc);
int rproc_set_firmware(struct rproc *rproc, const char *fw_name);
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);