of/fdt: Don't clear initial_boot_params if fdt_check_header() fails

If the device tree pointer is NULL, early_init_dt_verify() fails, leaving
initial_boot_params unchanged.  If the device tree pointer is non-NULL but
invalid, early_init_dt_verify() again fails but this time it also clears
initial_boot_params.

Leave initial_boot_params unchanged if the device tree pointer is invalid.
This doesn't fix a bug, but it makes the behavior more consistent and
easier to analyze.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 1d30b9f..5351246 100644 (file)
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -992,15 +992,12 @@ bool __init early_init_dt_verify(void *params)
        if (!params)
                return false;
 
-       /* Setup flat device-tree pointer */
-       initial_boot_params = params;
-
        /* check device tree validity */
-       if (fdt_check_header(params)) {
-               initial_boot_params = NULL;
+       if (fdt_check_header(params))
                return false;
-       }
 
+       /* Setup flat device-tree pointer */
+       initial_boot_params = params;
        return true;
 }