kexec: fix zImage probe

Add upstream patch to fix probe of zImage kernels.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/kexec/kexec-0003-kernel-image-probe-function-return-value-checking-fi.patch

@@ -0,0 +1,41 @@
+From 507e210daf047a5ef98de680151ace745297d82e Mon Sep 17 00:00:00 2001
+Message-Id: <507e210daf047a5ef98de680151ace745297d82e.1392728124.git.baruch@tkos.co.il>
+From: Dave Young <dyoung@redhat.com>
+Date: Thu, 6 Feb 2014 14:30:44 +0800
+Subject: [PATCH] kernel image probe function return value checking fix
+
+Currently kexec will use the kernel image type when probe function return
+value >=0. It looks odd, but previously it works. Since commit bf06cf2095
+it does not work anymore.
+
+During my testing for arm zImage, in 2nd kernel the atags pointer and the
+machine_id are not valid, I did a lot of debugging in kernel, finally I found
+this is caused by a kexec tools bug instead.
+
+Because uImage will be probed before zImage, also the uImage probe return 1
+instead of -1 since bf06cf2095, thus kexec will mistakenly think it is uImage.
+
+Fix this issue by regarding it's valid only when probe return 0.
+
+Signed-off-by: Dave Young <dyoung@redhat.com>
+Signed-off-by: Simon Horman <horms@verge.net.au>
+---
+ kexec/kexec.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/kexec/kexec.c b/kexec/kexec.c
+index f13e5124aacc..703d524836b4 100644
+--- a/kexec/kexec.c
++++ b/kexec/kexec.c
+@@ -691,7 +691,7 @@ static int my_load(const char *type, int fileind, int argc, char **argv,
+ 	}
+ 	if (!type || guess_only) {
+ 		for (i = 0; i < file_types; i++) {
+-			if (file_type[i].probe(kernel_buf, kernel_size) >= 0)
++			if (file_type[i].probe(kernel_buf, kernel_size) == 0)
+ 				break;
+ 		}
+ 		if (i == file_types) {
+-- 
+1.8.5.3
+