Re: [PATCH 2/4] x86/platform/UV: Fix problem with bad UV4 EFI System Table causing panic

Fix a problem that occurs if for some reason the UV4 EFI System Table
is not available, the check inadvertantly can cause a panic.

Reviewed-by: Dimitri Sivanich <redacted>
Reviewed-by: Nathan Zimmer <redacted>
Tested-by: Frank Ramsay <redacted>
Tested-by: John Estabrook <redacted>
Signed-off-by: Mike Travis <redacted>
---
 arch/x86/platform/uv/bios_uv.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- linux-3.12.orig/arch/x86/platform/uv/bios_uv.c
+++ linux-3.12/arch/x86/platform/uv/bios_uv.c

@@ -201,11 +201,12 @@ void uv_bios_init(void)
 	}
 
 	if (uv_systab->revision >= UV_SYSTAB_VERSION_UV4) {
+		int size = uv_systab->size;
+
 		iounmap(uv_systab);
-		uv_systab = ioremap(efi.uv_systab, uv_systab->size);