fdt: Update CRC check for rng-seed

commit dd753d961c4844a39f947be115b3d81e10376ee5 upstream.

Commit 428826f5358c ("fdt: add support for rng-seed") moves of_fdt_crc32
from early_init_dt_verify() to early_init_dt_scan() since
early_init_dt_scan_chosen() may modify fdt to erase rng-seed.

However, arm and some other arch won't call early_init_dt_scan(), they
call early_init_dt_verify() then early_init_dt_scan_nodes().

Restore of_fdt_crc32 to early_init_dt_verify() then update it in
early_init_dt_scan_chosen() if fdt if updated.

Fixes: 428826f5358c ("fdt: add support for rng-seed")
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 1d4090d2b91ed556a2d52c2de5dd64801e1ad963..512d3a8439c98ca5f399be4cc344def148be4e95 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1159,6 +1159,10 @@ int __init early_init_dt_scan_chosen(unsigned long node, const char *uname,
 
                /* try to clear seed so it won't be found. */
                fdt_nop_property(initial_boot_params, node, "rng-seed");
+
+               /* update CRC check value */
+               of_fdt_crc32 = crc32_be(~0, initial_boot_params,
+                               fdt_totalsize(initial_boot_params));
        }
 
        /* break now */
@@ -1272,6 +1276,8 @@ bool __init early_init_dt_verify(void *params)
 
        /* Setup flat device-tree pointer */
        initial_boot_params = params;
+       of_fdt_crc32 = crc32_be(~0, initial_boot_params,
+                               fdt_totalsize(initial_boot_params));
        return true;
 }
 
@@ -1297,8 +1303,6 @@ bool __init early_init_dt_scan(void *params)
                return false;
 
        early_init_dt_scan_nodes();
-       of_fdt_crc32 = crc32_be(~0, initial_boot_params,
-                               fdt_totalsize(initial_boot_params));
        return true;
 }