[PATCH v5 14/19] remoteproc: Add return value to function rproc_shutdown()

From: Mathieu Poirier
Date: Thu Feb 11 2021 - 18:53:01 EST


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@xxxxxxxxxx>
Reviewed-by: Peng Fan <peng.fan@xxxxxxx>
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@xxxxxx>
---
drivers/remoteproc/remoteproc_core.c | 19 ++++++++++++++-----
include/linux/remoteproc.h | 2 +-
2 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 9a77cb6d6470..62f708662052 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1966,7 +1966,7 @@ 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;
@@ -1974,15 +1974,19 @@ 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) {
@@ -1994,7 +1998,11 @@ void rproc_shutdown(struct rproc *rproc)
rproc_resource_cleanup(rproc);

/* release HW resources if needed */
- rproc_unprepare_device(rproc);
+ ret = rproc_unprepare_device(rproc);
+ if (ret) {
+ atomic_inc(&rproc->power);
+ goto out;
+ }

rproc_disable_iommu(rproc);

@@ -2007,6 +2015,7 @@ 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 e5f52a12a650..5b49c4018e90 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -664,7 +664,7 @@ 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);
--
2.25.1