From: Babu Moger <Babu.Moger@amd.com>
Date: Wed, 28 Nov 2018 22:42:47 +0000
Subject: x86/resctrl: Remove unnecessary check for cbm_validate()
Git-commit: cb74635faa17cfa2991ddbe027596270af525c6d
Patch-mainline: v5.0-rc1
References: fate#324432

The Smatch static checker reports the following error after commit:

  a36c5ff560fb ("x86/resctrl: Bring cbm_validate() into the resource structure"):

  arch/x86/kernel/cpu/resctrl/ctrlmondata.c:227 parse_cbm()
  error: uninitialized symbol 'cbm_val'.
  arch/x86/kernel/cpu/resctrl/ctrlmondata.c:236 parse_cbm()
  error: uninitialized symbol 'cbm_val'.

This could happen if ->cbm_validate() is NULL which could leave cbm_val
uninitialized.

However, there is no case where ->cbm_validate() can be NULL as it is
initialized based on a vendor check. So it is either an Intel or an AMD
version it points to. And in both the cases it is initialized properly.
Thus, remove the first check.

Verified the fix running Smatch.

 [ bp: massage commit message. ]

Fixes: a36c5ff560fb ("x86/resctrl: Bring cbm_validate() into the resource structure")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Babu Moger <babu.moger@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Reinette Chatre <reinette.chatre@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20181128224234.22998-1-babu.moger@amd.com
---
 arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index 03ee13235a45..ba11f54f5ab8 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -219,7 +219,7 @@ int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
 		return -EINVAL;
 	}
 
-	if (r->cbm_validate && !r->cbm_validate(data->buf, &cbm_val, r))
+	if (!r->cbm_validate(data->buf, &cbm_val, r))
 		return -EINVAL;
 
 	if ((rdtgrp->mode == RDT_MODE_EXCLUSIVE ||