MIPS: BCM63XX: Make nvram checksum failure non fatal

Some vendors modify the nvram layout moving the checksum to a different
place or dropping entirely, so reduce the checksum failure to a warning.

Reported-by: Álvaro Fernández Rojas <noltari@gmail.com>
Signed-off-by: Jonas Gorski <jogo@openwrt.org>
Cc: linux-mips@linux-mips.org
Cc: John Crispin <blogic@openwrt.org>
Cc: Maxime Bizon <mbizon@freebox.fr>
Cc: Florian Fainelli <florian@openwrt.org>
Cc: Kevin Cernekee <cernekee@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 5 insertions, 11 deletions

diff --git a/arch/mips/bcm63xx/boards/board_bcm963xx.c b/arch/mips/bcm63xx/boards/board_bcm963xx.c
index ed1949c29508..9aa7d44898ed 100644
--- a/arch/mips/bcm63xx/boards/board_bcm963xx.c
+++ b/arch/mips/bcm63xx/boards/board_bcm963xx.c
@@ -745,10 +745,7 @@ void __init board_prom_init(void)
                 strcpy(cfe_version, "unknown");
         printk(KERN_INFO PFX "CFE version: %s\n", cfe_version);
 
-        if (bcm63xx_nvram_init(boot_addr + BCM963XX_NVRAM_OFFSET)) {
-                printk(KERN_ERR PFX "invalid nvram checksum\n");
-                return;
-        }
+        bcm63xx_nvram_init(boot_addr + BCM963XX_NVRAM_OFFSET);
 
         board_name = bcm63xx_nvram_get_name();
         /* find board by name */
diff --git a/arch/mips/bcm63xx/nvram.c b/arch/mips/bcm63xx/nvram.c
index 620611680839..a4b8864f9307 100644
--- a/arch/mips/bcm63xx/nvram.c
+++ b/arch/mips/bcm63xx/nvram.c
@@ -38,7 +38,7 @@ struct bcm963xx_nvram {
 static struct bcm963xx_nvram nvram;
 static int mac_addr_used;
 
-int __init bcm63xx_nvram_init(void *addr)
+void __init bcm63xx_nvram_init(void *addr)
 {
         unsigned int check_len;
         u32 crc, expected_crc;
@@ -60,9 +60,8 @@ int __init bcm63xx_nvram_init(void *addr)
         crc = crc32_le(~0, (u8 *)&nvram, check_len);
 
         if (crc != expected_crc)
-                return -EINVAL;
-
-        return 0;
+                pr_warn("nvram checksum failed, contents may be invalid (expected %08x, got %08x)\n",
+                        expected_crc, crc);
 }
 
 u8 *bcm63xx_nvram_get_name(void)
diff --git a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_nvram.h b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_nvram.h
index 62d6a3b4d3b7..4e0b6bc1165e 100644
--- a/arch/mips/include/asm/mach-bcm63xx/bcm63xx_nvram.h
+++ b/arch/mips/include/asm/mach-bcm63xx/bcm63xx_nvram.h
@@ -9,10 +9,8 @@
  *
  * Initialized the local nvram copy from the target address and checks
  * its checksum.
- *
- * Returns 0 on success.
  */
-int __init bcm63xx_nvram_init(void *nvram);
+void bcm63xx_nvram_init(void *nvram);
 
 /**
  * bcm63xx_nvram_get_name() - returns the board name according to nvram