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author | Thomas Gleixner <tglx@linutronix.de> | 2012-07-19 13:59:38 -0400 |
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committer | Tony Luck <tony.luck@intel.com> | 2012-08-03 11:45:56 -0700 |
commit | b5975917a3e5f93b5d1c95561aab0aa44327baea (patch) | |
tree | aa2e9ffd6ba21164f2d891224552bed72ae4655a /arch/x86/kernel | |
parent | ea22571c8fd912f28e2525f7112bbb84b474ff3a (diff) | |
download | op-kernel-dev-b5975917a3e5f93b5d1c95561aab0aa44327baea.zip op-kernel-dev-b5975917a3e5f93b5d1c95561aab0aa44327baea.tar.gz |
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>
Diffstat (limited to 'arch/x86/kernel')
-rw-r--r-- | arch/x86/kernel/cpu/mcheck/mce-inject.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/x86/kernel/cpu/mcheck/mce-inject.c b/arch/x86/kernel/cpu/mcheck/mce-inject.c index 753746f..ddc72f8 100644 --- a/arch/x86/kernel/cpu/mcheck/mce-inject.c +++ b/arch/x86/kernel/cpu/mcheck/mce-inject.c @@ -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; } |