linux-kernel - [PATCH 2/2] [MTD] Call bdi_init() and bdi

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Date:	Mon, 26 Apr 2010 18:31:27 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Woodhouse <dwmw2@...radead.org>,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Christoph Hellwig <hch@...radead.org>,
	Paolo Minazzi <paolo.minazzi@...il.com>
Subject: [PATCH 2/2] [MTD] Call bdi_init() and bdi_register()

Otherwise we hit a BUG_ON in bdi_queue_work().

Signed-off-by: Joern Engel <joern@...fs.org>
---
 drivers/mtd/mtdcore.c |   17 ++++++++++++++++-
 1 files changed, 16 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index cb4858b..8dd3e46 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -299,7 +299,7 @@ static struct device_type mtd_devtype = {
 
 int add_mtd_device(struct mtd_info *mtd)
 {
-	int i;
+	int i, err;
 
 	if (!mtd->backing_dev_info) {
 		switch (mtd->type) {
@@ -322,6 +322,12 @@ int add_mtd_device(struct mtd_info *mtd)
 		if (!mtd_table[i]) {
 			struct mtd_notifier *not;
 
+			err = bdi_register(mtd->backing_dev_info, NULL, "mtd%d",
+					i);
+			if (err) {
+				/* We lose the errno information :( */
+				break;
+			}
 			mtd_table[i] = mtd;
 			mtd->index = i;
 			mtd->usecount = 0;
@@ -692,6 +698,15 @@ static int __init init_mtd(void)
 	int ret;
 	ret = class_register(&mtd_class);
 
+	ret = bdi_init(&mtd_bdi_unmappable);
+	if (ret)
+		return ret;
+	ret = bdi_init(&mtd_bdi_ro_mappable);
+	if (ret)
+		return ret;
+	ret = bdi_init(&mtd_bdi_rw_mappable);
+	if (ret)
+		return ret;
 	if (ret) {
 		pr_err("Error registering mtd class: %d\n", ret);
 		return ret;
-- 
1.6.2.1

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