[PATCH 2/4] kexec-uImage-arm64.c: Fix return value of uImage_arm64_probe()

[Bhupesh Sharma <bhsharma@redhat.com>]

Commit bf06cf2095e1 ("kexec/uImage: probe to identify a corrupted image"),
defined the 'uImage_probe_kernel()' function return values and
correspondingly ;uImage_arm64_probe()' returns the same (0 -> If the
image is valid 'type' image, -1 -> If the image is corrupted and
1 -> If the image is not a uImage).

This causes issues because, in later patches we introduce zImage
support for arm64, and since it is probed after uImage, the return
values from 'uImage_arm64_probe()' needs to be fixed to make sure
that kexec will not return with an invalid error code.

Now, 'uImage_arm64_probe()' returns the following values instead:
  0 - valid uImage.
 -1 - uImage is corrupted.
  1 - image is not a uImage.

Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
---
 kexec/arch/arm64/kexec-uImage-arm64.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/kexec/arch/arm64/kexec-uImage-arm64.c b/kexec/arch/arm64/kexec-uImage-arm64.c
index 126ea9c2555b..c4669131b667 100644
--- a/kexec/arch/arm64/kexec-uImage-arm64.c
+++ b/kexec/arch/arm64/kexec-uImage-arm64.c
@@ -11,7 +11,18 @@
 
 int uImage_arm64_probe(const char *buf, off_t len)
 {
-	return uImage_probe_kernel(buf, len, IH_ARCH_ARM64);
+	int ret;
+
+	ret = uImage_probe_kernel(buf, len, IH_ARCH_ARM64);
+
+	/*  0 - valid uImage.
+	 * -1 - uImage is corrupted.
+	 *  1 - image is not a uImage.
+	 */
+	if (!ret)
+		return 0;
+	else
+		return -1;
 }
 
 int uImage_arm64_load(int argc, char **argv, const char *buf, off_t len,
-- 
2.7.4


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