mtd: bcm47xxpart: support SquashFS with an original magic

SquashFS is supposed to use magic defined as SQUASHFS_MAGIC. What we
were supporting so far (SQSH_MAGIC) is something ZTE specific.
This patch adds support for Xiaomi R1D.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/bcm47xxpart.c b/drivers/mtd/bcm47xxpart.c
index 4ad3928..c0720c1 100644 (file)
--- a/drivers/mtd/bcm47xxpart.c
+++ b/drivers/mtd/bcm47xxpart.c
@@ -15,6 +15,8 @@
 #include <linux/mtd/mtd.h>
 #include <linux/mtd/partitions.h>
 
+#include <uapi/linux/magic.h>
+
 /*
  * NAND flash on Netgear R6250 was verified to contain 15 partitions.
  * This will result in allocating too big array for some old devices, but the
@@ -39,7 +41,7 @@
 #define ML_MAGIC1                      0x39685a42
 #define ML_MAGIC2                      0x26594131
 #define TRX_MAGIC                      0x30524448
-#define SQSH_MAGIC                     0x71736873      /* shsq */
+#define SHSQ_MAGIC                     0x71736873      /* shsq (weird ZTE H218N endianness) */
 #define UBI_EC_MAGIC                   0x23494255      /* UBI# */
 
 struct trx_header {
@@ -233,7 +235,8 @@ static int bcm47xxpart_parse(struct mtd_info *master,
                }
 
                /* Squashfs on devices not using TRX */
-               if (buf[0x000 / 4] == SQSH_MAGIC) {
+               if (le32_to_cpu(buf[0x000 / 4]) == SQUASHFS_MAGIC ||
+                   buf[0x000 / 4] == SHSQ_MAGIC) {
                        bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
                                             offset, 0);
                        continue;