[PATCH] powerpc: minor fix for bootargs property

[Geoff Levand <geoffrey.levand@am.sony.com>]

Avoid the use of an uninitialized stack variable when the powerpc device tree
bootargs property is either missing or incorrectly defined.  This also makes
CONFIG_CMDLINE work properly under these conditions.  This change adds a test
for the existence of the bootargs property.

early_init_dt_scan_chosen() tests for a zero length bootargs property in its
CONFIG_CMDLINE processing, but the current implementation of
of_get_flat_dt_prop() doesn't assign a value to the length when no property is
found.  Since an automatic variable is used, a stale value from the stack will
be used in the test.


Signed-off-by: Geoff Levand <geoffrey.levand@am.sony.com>

---

Index: cell--common--5/arch/powerpc/kernel/prom.c
===================================================================
--- cell--common--5.orig/arch/powerpc/kernel/prom.c
+++ cell--common--5/arch/powerpc/kernel/prom.c
@@ -724,7 +724,7 @@
 		strlcpy(cmd_line, p, min((int)l, COMMAND_LINE_SIZE));
 
 #ifdef CONFIG_CMDLINE
-	if (l == 0 || (l == 1 && (*p) == 0))
+	if (p == NULL || l == 0 || (l == 1 && (*p) == 0))
 		strlcpy(cmd_line, CONFIG_CMDLINE, COMMAND_LINE_SIZE);
 #endif /* CONFIG_CMDLINE */