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@xxxxxx> --- v3: - New patch in place of v2 patch "remoteproc: Add support for detach-only during shutdown", https://patchwork.kernel.org/project/linux-remoteproc/patch/20210723220248.6554-2-s-anna@xxxxxx/ Documentation/staging/remoteproc.rst | 3 ++- drivers/remoteproc/remoteproc_cdev.c | 2 +- drivers/remoteproc/remoteproc_core.c | 9 ++++++--- drivers/remoteproc/remoteproc_sysfs.c | 2 +- include/linux/remoteproc.h | 2 +- 5 files changed, 11 insertions(+), 7 deletions(-) diff --git a/Documentation/staging/remoteproc.rst b/Documentation/staging/remoteproc.rst index 9cccd3dd6a4b..348ee7e508ac 100644 --- a/Documentation/staging/remoteproc.rst +++ b/Documentation/staging/remoteproc.rst @@ -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. diff --git a/drivers/remoteproc/remoteproc_cdev.c b/drivers/remoteproc/remoteproc_cdev.c index 4ad98b0b8caa..906ff3c4dfdd 100644 --- a/drivers/remoteproc/remoteproc_cdev.c +++ b/drivers/remoteproc/remoteproc_cdev.c @@ -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; diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c index 69f51acf235e..c510125769b9 100644 --- a/drivers/remoteproc/remoteproc_core.c +++ b/drivers/remoteproc/remoteproc_core.c @@ -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); diff --git a/drivers/remoteproc/remoteproc_sysfs.c b/drivers/remoteproc/remoteproc_sysfs.c index ea8b89f97d7b..645c70c8109b 100644 --- a/drivers/remoteproc/remoteproc_sysfs.c +++ b/drivers/remoteproc/remoteproc_sysfs.c @@ -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; diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h index e0600e1e5c17..cfc0c95c95b2 100644 --- a/include/linux/remoteproc.h +++ b/include/linux/remoteproc.h @@ -669,7 +669,7 @@ 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); -- 2.32.0
