UBI: introduce flash dump helper

Useful for debugging problems, compiled in only if UBI debugging
is enabled. This patch also makes the UBI writing function dump
the flash if it fails to write.

Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 4e7bcb215075..b693138fc519 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -269,6 +269,7 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
                 ubi_err("error %d while writing %d bytes to PEB %d:%d, written "
                         "%zd bytes", err, len, pnum, offset, written);
                 ubi_dbg_dump_stack();
+                ubi_dbg_dump_flash(ubi, pnum, offset, len);
         } else
                 ubi_assert(written == len);