kernel: make ubi auto-attach check for a tar file magic

[openwrt.git] / target / linux / generic / patches-3.10 / 490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch

diff --git a/target/linux/generic/patches-3.10/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch b/target/linux/generic/patches-3.10/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
index b0b367e..68e98ca 100644 (file)
--- a/target/linux/generic/patches-3.10/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
+++ b/target/linux/generic/patches-3.10/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
@@ -11,7 +11,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 
 --- a/drivers/mtd/ubi/build.c
 +++ b/drivers/mtd/ubi/build.c
-@@ -1207,6 +1207,36 @@ static struct mtd_info * __init open_mtd
+@@ -1207,6 +1207,47 @@
        return mtd;
  }
  
@@ -29,6 +29,17 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
 +              mtd = open_mtd_device("data");
 +
 +      if (!IS_ERR(mtd)) {
++              size_t len;
++              char magic[6];
++
++              /* check for a tar file magic */
++              err = mtd_read(mtd, 261, 6, &len, (void *) magic);
++              if (!err && len == 6 && !strncmp(magic, "ustar", 5)) {
++                      ubi_err("cannot attach mtd%d as there is a valid tar magic", mtd->index);
++                      put_mtd_device(mtd);
++                      return;
++              }
++
 +              /* auto-add only media types where UBI makes sense */
 +              if (mtd->type == MTD_NANDFLASH ||
 +                  mtd->type == MTD_DATAFLASH ||
@@ -48,7 +59,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
  static int __init ubi_init(void)
  {
        int err, i, k;
-@@ -1290,6 +1320,12 @@ static int __init ubi_init(void)
+@@ -1290,6 +1331,12 @@
                }
        }