edac: core fix workq timer

When updating the edac_mc_poll_msec module parameter from the sysfs
/sys/module/edac_core/parameters/edac_mc_poll_msec file, we don't update
the workq timers.  So that, if we move from a big poll time to a small
one, the small one won't take effect until the big one has timed out.

Here we provide a new module parameter set method to call out to the
update routine.  This brings the /sys/module/edac_core/parameters
functionality up to that provided by the /sys/drivers/system/edac/mc sysfs
module parameter files so that we can remove them or at least link to the
/sys/module files...

Signed-off-by: Arthur Jones <ajones@riverbed.com>
Signed-off-by: Doug Thompson <dougthompson@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 21 insertions, 1 deletions

diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 021d18795145..7bb9c1532b90 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -44,6 +44,25 @@ int edac_mc_get_poll_msec(void)
         return edac_mc_poll_msec;
 }
 
+static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
+{
+        long l;
+        int ret;
+
+        if (!val)
+                return -EINVAL;
+
+        ret = strict_strtol(val, 0, &l);
+        if (ret == -EINVAL || ((int)l != l))
+                return -EINVAL;
+        *((int *)kp->arg) = l;
+
+        /* notify edac_mc engine to reset the poll period */
+        edac_mc_reset_delay_period(l);
+
+        return 0;
+}
+
 /* Parameter declarations for above */
 module_param(edac_mc_panic_on_ue, int, 0644);
 MODULE_PARM_DESC(edac_mc_panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
@@ -53,7 +72,8 @@ MODULE_PARM_DESC(edac_mc_log_ue,
 module_param(edac_mc_log_ce, int, 0644);
 MODULE_PARM_DESC(edac_mc_log_ce,
                  "Log correctable error to console: 0=off 1=on");
-module_param(edac_mc_poll_msec, int, 0644);
+module_param_call(edac_mc_poll_msec, edac_set_poll_msec, param_get_int,
+                  &edac_mc_poll_msec, 0644);
 MODULE_PARM_DESC(edac_mc_poll_msec, "Polling period in milliseconds");
 
 /*