[PATCH] mtd: intel-dg: Fix runtime PM error path in probe

[Guangshuo Li]

intel_dg_mtd_probe() allocates region names before enabling runtime PM
and before calling pm_runtime_resume_and_get().

If kasprintf() fails while building a region name, the error path jumps
to err, which calls pm_runtime_put(). At that point there has not been a
successful pm_runtime_resume_and_get() call to balance, so the runtime PM
usage count can underflow.

Jump to err_norpm from the kasprintf() failure path, as the runtime PM
reference has not been acquired yet.

Fixes: 779c59274d03 ("mtd: intel-dg: Fix accessing regions before setting nregions")
Signed-off-by: Guangshuo Li <lgs201920130244 at gmail.com>
---
 drivers/mtd/devices/mtd_intel_dg.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/devices/mtd_intel_dg.c b/drivers/mtd/devices/mtd_intel_dg.c
index f2fa8f68d190..a566e86eb5e3 100644
--- a/drivers/mtd/devices/mtd_intel_dg.c
+++ b/drivers/mtd/devices/mtd_intel_dg.c
@@ -780,7 +780,7 @@ static int intel_dg_mtd_probe(struct auxiliary_device *aux_dev,
 				       dev_name(&aux_dev->dev), invm->regions[i].name);
 		if (!name) {
 			ret = -ENOMEM;
-			goto err;
+			goto err_norpm;
 		}
 
 		nvm->regions[n].name = name;
-- 
2.43.0