[PATCH 14/23] mtd: clean up the backing_dev_info usage

[Peter Zijlstra <a.p.zijlstra@chello.nl>]

Give each mtd device its own backing_dev_info instance.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: David Woodhouse <dwmw2@infradead.org>
---
 drivers/mtd/mtdcore.c   |    8 +++++---
 include/linux/mtd/mtd.h |    2 ++
 2 files changed, 7 insertions(+), 3 deletions(-)

Index: linux-2.6/drivers/mtd/mtdcore.c
===================================================================
--- linux-2.6.orig/drivers/mtd/mtdcore.c
+++ linux-2.6/drivers/mtd/mtdcore.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/mtd/compatmac.h>
 #include <linux/proc_fs.h>
+#include <linux/backing-dev.h>
 
 #include <linux/mtd/mtd.h>
 #include "internal.h"
@@ -53,15 +54,16 @@ int add_mtd_device(struct mtd_info *mtd)
 	if (!mtd->backing_dev_info) {
 		switch (mtd->type) {
 		case MTD_RAM:
-			mtd->backing_dev_info = &mtd_bdi_rw_mappable;
+			mtd->mtd_backing_dev_info = mtd_bdi_rw_mappable;
 			break;
 		case MTD_ROM:
-			mtd->backing_dev_info = &mtd_bdi_ro_mappable;
+			mtd->mtd_backing_dev_info = mtd_bdi_ro_mappable;
 			break;
 		default:
-			mtd->backing_dev_info = &mtd_bdi_unmappable;
+			mtd->mtd_backing_dev_info = mtd_bdi_unmappable;
 			break;
 		}
+		mtd->backing_dev_info = &mtd->mtd_backing_dev_info;
 	}
 	err = bdi_init(mtd->backing_dev_info);
 	if (err)
Index: linux-2.6/include/linux/mtd/mtd.h
===================================================================
--- linux-2.6.orig/include/linux/mtd/mtd.h
+++ linux-2.6/include/linux/mtd/mtd.h
@@ -13,6 +13,7 @@
 #include <linux/module.h>
 #include <linux/uio.h>
 #include <linux/notifier.h>
+#include <linux/backing-dev.h>
 
 #include <linux/mtd/compatmac.h>
 #include <mtd/mtd-abi.h>
@@ -154,6 +155,7 @@ struct mtd_info {
 	 * - provides mmap capabilities
 	 */
 	struct backing_dev_info *backing_dev_info;
+	struct backing_dev_info mtd_backing_dev_info;
 
 
 	int (*read) (struct mtd_info *mtd, loff_t from, size_t len, size_t *retlen, u_char *buf);

--

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