x86/mcheck: Be prepared for a rollback back to the ONLINE state
If we try a CPU down and fail in the middle then we roll back to the
online state. This means we would perform CPU_ONLINE / mce_device_create()
without invoking CPU_DEAD / mce_device_remove() for the cleanup of what was
allocated in CPU_ONLINE.
Be prepared for this and don't allocate the struct if we have it
already.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: rt@linutronix.de
Cc: linux-edac@vger.kernel.org
Link: http://lkml.kernel.org/r/20161110174447.11848-4-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index a7fdf45..e9ffd6d 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2409,6 +2409,10 @@ static int mce_device_create(unsigned int cpu)
if (!mce_available(&boot_cpu_data))
return -EIO;
+ dev = per_cpu(mce_device, cpu);
+ if (dev)
+ return 0;
+
dev = kzalloc(sizeof *dev, GFP_KERNEL);
if (!dev)
return -ENOMEM;
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 55cd018..e93580c 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -1097,6 +1097,10 @@ static int threshold_create_device(unsigned int cpu)
struct threshold_bank **bp;
int err = 0;
+ bp = per_cpu(threshold_banks, cpu);
+ if (bp)
+ return 0;
+
bp = kzalloc(sizeof(struct threshold_bank *) * mca_cfg.banks,
GFP_KERNEL);
if (!bp)