x86, smp: clean up mps_oem_check()

Impact: cleanup

 - allow NULL ->mps_oem_check() entries

 - clean up the code flow

Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 13 insertions, 9 deletions

diff --git a/arch/x86/mach-generic/probe.c b/arch/x86/mach-generic/probe.c
index a21e2b1a7011..799a70f4d90e 100644
--- a/arch/x86/mach-generic/probe.c
+++ b/arch/x86/mach-generic/probe.c
@@ -113,17 +113,21 @@ void __init generic_apic_probe(void)
 int __init mps_oem_check(struct mpc_table *mpc, char *oem, char *productid)
 {
         int i;
+
         for (i = 0; apic_probe[i]; ++i) {
-                if (apic_probe[i]->mps_oem_check(mpc, oem, productid)) {
-                        if (!cmdline_apic) {
-                                apic = apic_probe[i];
-                                if (x86_quirks->update_genapic)
-                                        x86_quirks->update_genapic();
-                                printk(KERN_INFO "Switched to APIC driver `%s'.\n",
-                                       apic->name);
-                        }
-                        return 1;
+                if (!apic_probe[i]->mps_oem_check)
+                        continue;
+                if (!apic_probe[i]->mps_oem_check(mpc, oem, productid))
+                        continue;
+
+                if (!cmdline_apic) {
+                        apic = apic_probe[i];
+                        if (x86_quirks->update_genapic)
+                                x86_quirks->update_genapic();
+                        printk(KERN_INFO "Switched to APIC driver `%s'.\n",
+                               apic->name);
                 }
+                return 1;
         }
         return 0;
 }