[PATCH 09/13] remoteproc: Add return value to function rproc_shutdown()

Mathieu Poirier
2020-08-26T16:46:11Z

Add a return value to function rproc_shutdown() in order to
properly deal with error conditions that may occur.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
drivers/remoteproc/remoteproc_core.c | 13 +++++++++----
include/linux/remoteproc.h | 2 +-
2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index c4b80ce6f22d..c6c6aba66098 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1846,7 +1846,7 @@ EXPORT_SYMBOL(rproc_boot);
* returns, and users can still use it with a subsequent rproc_boot(), if
* needed.
*/
-void rproc_shutdown(struct rproc *rproc)
+int rproc_shutdown(struct rproc *rproc)
{
struct device *dev = &rproc->dev;
int ret;
@@ -1854,15 +1854,19 @@ void rproc_shutdown(struct rproc *rproc)
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 (rproc->state != RPROC_RUNNING)
+ if (rproc->state != RPROC_RUNNING) {
+ ret = -EPERM;
goto out;
+ }

/* if the remote proc is still needed, bail out */
- if (!atomic_dec_and_test(&rproc->power))
+ if (!atomic_dec_and_test(&rproc->power)) {
+ ret = -EBUSY;
goto out;
+ }

ret = rproc_stop(rproc, false);
if (ret) {
@@ -1884,6 +1888,7 @@ void rproc_shutdown(struct rproc *rproc)
rproc->table_ptr = NULL;
out:
mutex_unlock(&rproc->lock);
+ return ret;
}
EXPORT_SYMBOL(rproc_shutdown);

diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 6250491ee851..40eccfbc1357 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -655,7 +655,7 @@ 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);
void rproc_report_crash(struct rproc *rproc, enum rproc_crash_type type);
int rproc_coredump_add_segment(struct rproc *rproc, dma_addr_t da, size_t size);
--
2.25.1