Some mtd device does not support lock and unlock functions. Adding this check
avoids crashing when mtd_part_lock/unlock are called for such devices.
Signed-off-by: Zahari Doychev <zahari.doychev@xxxxxxxxx>
---
drivers/mtd/partition.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/mtd/partition.c b/drivers/mtd/partition.c
index 5c0d46f..5a3d1ae 100644
--- a/drivers/mtd/partition.c
+++ b/drivers/mtd/partition.c
@@ -51,6 +51,9 @@ static int mtd_part_erase(struct mtd_info *mtd, struct erase_info *instr)
static int mtd_part_lock(struct mtd_info *mtd, loff_t offset, size_t len)
{
+ if (!mtd->master->lock)
+ return -ENOSYS;
+
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
@@ -64,6 +67,9 @@ static int mtd_part_lock(struct mtd_info *mtd, loff_t offset, size_t len)
static int mtd_part_unlock(struct mtd_info *mtd, loff_t offset, size_t len)
{
+ if (!mtd->master->unlock)
+ return -ENOSYS;
+
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
--
1.7.9.5
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