[RESEND PATCH v2 3/3] mtd: ubi: use 'max_bad_blocks' to compute bad_peb_limit if available

[Zach Brown]

From: Jeff Westfahl <jeff.westfahl@xxxxxx>

Use the MTD function 'max_bad_blocks' to compute the UBI bad_peb_limit,
if the function is implemented for an MTD and doesn't return an error.

Signed-off-by: Jeff Westfahl <jeff.westfahl@xxxxxx>
Signed-off-by: Zach Brown <zach.brown@xxxxxx>
---
 drivers/mtd/ubi/build.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 85d54f3..0648863 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -584,6 +584,15 @@ static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
 	int limit, device_pebs;
 	uint64_t device_size;
 
+	/* If the MTD provides a max_bad_blocks function, use that value. Fall
+	 * back to max_beb_per1024 if that function returns an error.
+	 */
+	if (ubi->mtd->_max_bad_blocks) {
+		limit = ubi->mtd->_max_bad_blocks(ubi->mtd, 0, ubi->mtd->size);
+		if (limit > 0)
+			return limit;
+	}
+
 	if (!max_beb_per1024)
 		return 0;
 
-- 
2.7.4