MIPS: Do not request resources for crashkernel if one isn't defined

When KEXEC is enabled but crashkernel details are not passed through the
kernel commandline unnecessary resources are requested (start==end==0)

Signed-off-by: Marcin Nowakowski <marcin.nowakowski@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14607/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index f66e5ce505b2..0058feaa65e5 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -672,6 +672,9 @@ static void __init request_crashkernel(struct resource *res)
 {
         int ret;
 
+        if (crashk_res.start == crashk_res.end)
+                return;
+
         ret = request_resource(res, &crashk_res);
         if (!ret)
                 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel\n",