x86/MCE: Remove min interval polling limitation

commit fbdb328c6bae0a7c78d75734a738b66b86dffc96 upstream.

commit b3b7c4795c ("x86/MCE: Serialize sysfs changes") introduced a min
interval limitation when setting the check interval for polled MCEs.
However, the logic is that 0 disables polling for corrected MCEs, see
Documentation/x86/x86_64/machinecheck. The limitation prevents disabling.

Remove this limitation and allow the value 0 to disable polling again.

Fixes: b3b7c4795c ("x86/MCE: Serialize sysfs changes")
Signed-off-by: Dewet Thibaut <thibaut.dewet@nokia.com>
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@nokia.com>
[ Massage commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: stable@vger.kernel.org
Link: http://lkml.kernel.org/r/20180716084927.24869-1-alexander.sverdlin@nokia.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index c49e146d433294f2efa49d7022b2f3b67129954c..7e6163c9d4345e1b4e11ee163caa5efaeb3fcffe 100644 (file)
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2397,9 +2397,6 @@ static ssize_t store_int_with_restart(struct device *s,
        if (check_interval == old_check_interval)
                return ret;
 
-       if (check_interval < 1)
-               check_interval = 1;
-
        mutex_lock(&mce_sysfs_mutex);
        mce_restart();
        mutex_unlock(&mce_sysfs_mutex);