From: Josh Cartwright <joshc@codeaurora.org>
Date: Thu, 13 Mar 2014 21:36:36 +0000 (-0500)
Subject: of: only scan for reserved mem when fdt present
X-Git-Tag: firefly_0821_release~3680^2~36^2~42^2~5
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=b94c8bedffeabb49f57bed9de17030f2addd21a0;p=firefly-linux-kernel-4.4.55.git

of: only scan for reserved mem when fdt present

When the reserved memory patches hit -next, several legacy (non-DT) boot
failures were detected and bisected down to that commit. There needs to
be some sanity checking whether a DT is even present before parsing the
reserved ranges.

Reported-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Josh Cartwright <joshc@codeaurora.org>
Tested-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
(cherry picked from commit 2040b52768ebab6e7bd73af0dc63703269c62f17)
Signed-off-by: Mark Brown <broonie@linaro.org>
---

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index b6e4d7fcd316..e521121ff71e 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -559,6 +559,9 @@ static int __init __fdt_scan_reserved_mem(unsigned long node, const char *uname,
  */
 void __init early_init_fdt_scan_reserved_mem(void)
 {
+	if (!initial_boot_params)
+		return;
+
 	of_scan_flat_dt(__fdt_scan_reserved_mem, NULL);
 	fdt_init_reserved_mem();
 }