x86/mce: Fix return value of mce_chrdev_read() when erst is disabled

[platform/adaptation/renesas_rcar/renesas_kernel.git] / arch / x86 / kernel / cpu / mcheck / mce.c

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 5a11ae2..87c56ba 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1541,6 +1541,12 @@ static int __mce_read_apei(char __user **ubuf, size_t usize)
        /* Error or no more MCE record */
        if (rc <= 0) {
                mce_apei_read_done = 1;
+               /*
+                * When ERST is disabled, mce_chrdev_read() should return
+                * "no record" instead of "no device."
+                */
+               if (rc == -ENODEV)
+                       return 0;
                return rc;
        }
        rc = -EFAULT;
@@ -1859,7 +1865,7 @@ static struct bus_type mce_subsys = {
        .dev_name       = "machinecheck",
 };
 
-struct device *mce_device[CONFIG_NR_CPUS];
+DEFINE_PER_CPU(struct device *, mce_device);
 
 __cpuinitdata
 void (*threshold_cpu_callback)(unsigned long action, unsigned int cpu);
@@ -2038,7 +2044,7 @@ static __cpuinit int mce_device_create(unsigned int cpu)
                        goto error2;
        }
        cpumask_set_cpu(cpu, mce_device_initialized);
-       mce_device[cpu] = dev;
+       per_cpu(mce_device, cpu) = dev;
 
        return 0;
 error2:
@@ -2055,7 +2061,7 @@ error:
 
 static __cpuinit void mce_device_remove(unsigned int cpu)
 {
-       struct device *dev = mce_device[cpu];
+       struct device *dev = per_cpu(mce_device, cpu);
        int i;
 
        if (!cpumask_test_cpu(cpu, mce_device_initialized))
@@ -2069,7 +2075,7 @@ static __cpuinit void mce_device_remove(unsigned int cpu)
 
        device_unregister(dev);
        cpumask_clear_cpu(cpu, mce_device_initialized);
-       mce_device[cpu] = NULL;
+       per_cpu(mce_device, cpu) = NULL;
 }
 
 /* Make sure there are no machine checks on offlined CPUs. */