UBI: fix autoresize handling in R/O mode

commit abb3e01103eb4e2ea5c15e6fedbc74e08bd4cc2b upstream.

Currently UBI fails in autoresize when it is in R/O mode (e.g., because the
underlying MTD device is R/O). This patch fixes the issue - we just skip
autoresize and print a warning.

Reported-by: Pali Rohár <pali.rohar@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 6c3fb5a..1f9c363 100644 (file)
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -816,6 +816,11 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
        struct ubi_volume *vol = ubi->volumes[vol_id];
        int err, old_reserved_pebs = vol->reserved_pebs;
 
+       if (ubi->ro_mode) {
+               ubi_warn("skip auto-resize because of R/O mode");
+               return 0;
+       }
+
        /*
         * Clear the auto-resize flag in the volume in-memory copy of the
         * volume table, and 'ubi_resize_volume()' will propagate this change