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x86: mce: Serialize mce injection 

raise_mce() fiddles with global state, but lacks any kind of
serialization.

Add a mutex around the raise_mce() call, so concurrent writers do not
stomp on each other toes.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Chen Gong <gong.chen@linux.intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Thomas Gleixner 2012-07-19 13:59:38 -04:00 committed by Tony Luck
parent ea22571c8f
commit b5975917a3
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kernel/cpu/mcheck/mce-inject.c
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@ -78,6 +78,7 @@ static void raise_exception(struct mce *m, struct pt_regs *pregs)
}
static cpumask_var_t mce_inject_cpumask;
static DEFINE_MUTEX(mce_inject_mutex);
static int mce_raise_notify(unsigned int cmd, struct pt_regs *regs)
{
@ -229,7 +230,10 @@ static ssize_t mce_write(struct file *filp, const char __user *ubuf,
* so do it a jiffie or two later everywhere.
*/
schedule_timeout(2);
mutex_lock(&mce_inject_mutex);
raise_mce(&m);
mutex_unlock(&mce_inject_mutex);
return usize;
}