On Fri, Jul 19, 2013 at 11:04:58AM +0200, Michal Hocko wrote:
> proc_dowatchdog doesn't synchronize multiple callers which
> might lead to confusion when two parallel callers might confuse
> watchdog_enable_all_cpus resp. watchdog_disable_all_cpus (e.g. watchdog
> gets enabled even if watchdog_thresh was set to 0 already).
>
> This patch adds a local mutex which synchronizes callers to the sysctl
> handler.
Looks fine by me, except one little nitpick..
>
> Signed-off-by: Michal Hocko <mho...@suse.cz>
> ---
> kernel/watchdog.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/kernel/watchdog.c b/kernel/watchdog.c
> index 1241d8c..2d64c02 100644
> --- a/kernel/watchdog.c
> +++ b/kernel/watchdog.c
> @@ -520,13 +520,15 @@ int proc_dowatchdog(struct ctl_table *table, int write,
> void __user *buffer, size_t *lenp, loff_t *ppos)
> {
> int err, old_thresh, old_enabled;
> + static DEFINE_MUTEX(watchdog_proc_mutex);
Should we just make this global instead of hiding it as a static inside a
function. I don't know the kernel rules for deciding which approach makes
sense. I know it is the same result in either case...
Cheers,
Don
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