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Subject[PATCH] (Resend #3) mtd: map_rom has NULL erase pointer
Date
From: Alan Cox <alan@redhat.com>

Which means if inftl or similar are loaded with it (which is a dumb thing
to do admittedly) it may oops

Closes #8108

Signed-off-by: Alan Cox <alan@redhat.com>
---
drivers/mtd/chips/map_rom.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/chips/map_rom.c b/drivers/mtd/chips/map_rom.c
index 821d0ed..8fb3280 100644
--- a/drivers/mtd/chips/map_rom.c
+++ b/drivers/mtd/chips/map_rom.c
@@ -19,6 +19,7 @@ static int maprom_read (struct mtd_info *, loff_t, size_t, size_t *, u_char *);
static int maprom_write (struct mtd_info *, loff_t, size_t, size_t *, const u_char *);
static void maprom_nop (struct mtd_info *);
static struct mtd_info *map_rom_probe(struct map_info *map);
+static int maprom_erase (struct mtd_info *mtd, struct erase_info *info);

static struct mtd_chip_driver maprom_chipdrv = {
.probe = map_rom_probe,
@@ -42,6 +43,7 @@ static struct mtd_info *map_rom_probe(struct map_info *map)
mtd->read = maprom_read;
mtd->write = maprom_write;
mtd->sync = maprom_nop;
+ mtd->erase = maprom_erase;
mtd->flags = MTD_CAP_ROM;
mtd->erasesize = map->size;
mtd->writesize = 1;
@@ -71,6 +73,12 @@ static int maprom_write (struct mtd_info *mtd, loff_t to, size_t len, size_t *re
return -EIO;
}

+static int maprom_erase (struct mtd_info *mtd, struct erase_info *info)
+{
+ /* We do our best 8) */
+ return -EIO;
+}
+
static int __init map_rom_init(void)
{
register_mtd_chip_driver(&maprom_chipdrv);


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