[PATCH] libnvdimm/bus: return the outvar 'cmd_rc' error code in __nd_ioctl()

Presently the error code returned via out variable 'cmd_rc' from the
nvdimm-bus controller function is ignored when called from
__nd_ioctl() and never communicated back to user-space code that called
an ioctl on dimm/bus.

This minor patch updates __nd_ioctl() to propagate the value of out
variable 'cmd_rc' back to user-space in case it reports an error.

Signed-off-by: Vaibhav Jain <redacted>
---
 drivers/nvdimm/bus.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index a8b515968569..5b687a27fdf2 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c

@@ -1153,6 +1153,11 @@ static int __nd_ioctl(struct nvdimm_bus *nvdimm_bus, struct nvdimm *nvdimm,
 	if (rc < 0)
 		goto out_unlock;
 
+	if (cmd_rc < 0) {
+		rc = cmd_rc;
+		goto out_unlock;
+	}
+
 	if (!nvdimm && cmd == ND_CMD_CLEAR_ERROR && cmd_rc >= 0) {
 		struct nd_cmd_clear_error *clear_err = buf;
 

-- 
2.24.1