From: Heiner Kallweit <hkallweit1@gmail.com>
Date: Fri, 9 Jun 2017 09:59:09 +0000 (+0100)
Subject: nvmem: core: add locking to nvmem_find_cell
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=666d6a36234f3123e909165ac32ea692213f0155;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

nvmem: core: add locking to nvmem_find_cell

Adding entries to nvmem_cells and deleting entries from it is
protected by nvmem_cells_mutex. Therefore this mutex should
also protect iterating over the list.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 0cbac71195b5..4c49285168fb 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -287,9 +287,15 @@ static struct nvmem_cell *nvmem_find_cell(const char *cell_id)
 {
 	struct nvmem_cell *p;
 
+	mutex_lock(&nvmem_cells_mutex);
+
 	list_for_each_entry(p, &nvmem_cells, node)
-		if (p && !strcmp(p->name, cell_id))
+		if (p && !strcmp(p->name, cell_id)) {
+			mutex_unlock(&nvmem_cells_mutex);
 			return p;
+		}
+
+	mutex_unlock(&nvmem_cells_mutex);
 
 	return NULL;
 }