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

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Date:	Fri, 25 Sep 2015 17:09:16 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org,
	Artem Bityutskiy <dedekind1@...il.com>,
	Richard Weinberger <richard@....at>
Cc:	Andrea Scian <rnd4@...e-tech.it>,
	Bean Huo 霍斌斌 (beanhuo) 
	<beanhuo@...ron.com>,
	Karl Zhang 张双锣 (karlzhang) 
	<karlzhang@...ron.com>,
	Iwo Mergler <Iwo.Mergler@...commwireless.com>,
	"Jeff Lauruhn (jlauruhn)" <jlauruhn@...ron.com>,
	Stefan Roese <sr@...x.de>, linux-kernel@...r.kernel.org,
	Boris Brezillon <boris.brezillon@...e-electrons.com>
Subject: [PATCH 3/5] UBI: switch the UBI device in read-only mode when mtd returns -EROFS

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@...e-electrons.com>
---
 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);
 			yield();
-- 
1.9.1

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