[PATCH 3/5] UBI: switch the UBI device in read-only mode when mtd returns -EROFS

From: Boris Brezillon
Date: Fri Sep 25 2015 - 11:14:50 EST

The NAND layer is now able to forward power-cut emulation errors from
a NAND driver to the MTD user.
Check for this kind of errors in UBI and switch the UBI device in read-only
mode if such an error occurs.
The error will also be forwarded to the UBI user requesting the operation
if any, thus allowing UBIFS to act accordingly.

Signed-off-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
drivers/mtd/ubi/io.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/mtd/ubi/io.c b/drivers/mtd/ubi/io.c
index 5bbd1f0..c5ebef7 100644
--- a/drivers/mtd/ubi/io.c
+++ b/drivers/mtd/ubi/io.c
@@ -303,6 +303,8 @@ int ubi_io_write(struct ubi_device *ubi, const void *buf, int pnum, int offset,
len = ubi->peb_size - offset;
if (len)
err = ubi_self_check_all_ff(ubi, pnum, offset, len);
+ } else if (err == -EROFS) {
+ ubi_ro_mode(ubi);

return err;
@@ -355,7 +357,7 @@ retry:

err = mtd_erase(ubi->mtd, &ei);
if (err) {
- if (retries++ < UBI_IO_RETRIES) {
+ if (err != -EROFS && retries++ < UBI_IO_RETRIES) {
ubi_warn(ubi, "error %d while erasing PEB %d, retry",
err, pnum);

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