add brcm47xx mtd corruption fix by b.sander (#1502)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@7675 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/target/linux/brcm47xx-2.6/files/drivers/mtd/maps/bcm47xx-flash.c b/target/linux/brcm47xx-2.6/files/drivers/mtd/maps/bcm47xx-flash.c
index 5068af8..6a82f36 100644 (file)
--- a/target/linux/brcm47xx-2.6/files/drivers/mtd/maps/bcm47xx-flash.c
+++ b/target/linux/brcm47xx-2.6/files/drivers/mtd/maps/bcm47xx-flash.c
@@ -80,6 +80,22 @@ extern struct ssb_bus ssb;
 #endif
 static struct mtd_info *bcm947xx_mtd;
 
+static void bcm947xx_map_copy_from(struct map_info *map, void *to, unsigned long from, ssize_t len)
+{
+       if (len==1) {
+               memcpy_fromio(to, map->virt + from, len);
+       } else {
+               int i;
+               u16 *dest = (u16 *) to;
+               u16 *src  = (u16 *) (map->virt + from);
+               for (i = 0; i < (len / 2); i++) {
+                       dest[i] = src[i];
+               }
+               if (len & 1)
+                       *((u8 *)dest+len-1) = src[i] & 0xff;
+       }
+}
+
 static struct map_info bcm947xx_map = {
        name: "Physically mapped flash",
        size: WINDOW_SIZE,
@@ -372,6 +388,7 @@ int __init init_bcm947xx_map(void)
                printk("Failed to ioremap\n");
                return -EIO;
        }
+
        simple_map_init(&bcm947xx_map);
        
        if (!(bcm947xx_mtd = do_map_probe("cfi_probe", &bcm947xx_map))) {
@@ -380,6 +397,9 @@ int __init init_bcm947xx_map(void)
                return -ENXIO;
        }
 
+       /* override copy_from routine */
+       bcm947xx_map.copy_from = bcm947xx_map_copy_from;
+
        bcm947xx_mtd->owner = THIS_MODULE;
 
        size = bcm947xx_mtd->size;