Merge tag 'edac_for_3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp

Pull EDAC fixes from Borislav Petkov:
 "Fix polling timeout setting through sysfs.

  You're surely wondering why the patches are not based on an rc.  Well,
  Andrew sent you 79040cad3f82 ("drivers/edac/edac_mc_sysfs.c: poll
  timeout cannot be zero sent you") already (it got in in -rc2) but it
  is not enough as a fix because for one, setting too low polling
  intervals (< 1sec) don't make any sense and cause unnecessary polling
  load on the system.

  Then, even if we set some interval, we explode with

    [ 4143.094342] WARNING: CPU: 1 PID: 0 at kernel/workqueue.c:1393 __queue_work+0x1d7/0x340()

  because the workqueue setup path is used also for the timeout period
  resetting and we're doing INIT_DELAYED_WORK() on an already active
  workqueue.  Which is total bollocks.  So this is taken care of by the
  second patch.

  I've CCed stable for those two"

* tag 'edac_for_3.14' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp:
  EDAC: Correct workqueue setup path
  EDAC: Poll timeout cannot be zero, p2

3 files changed, 15 insertions, 10 deletions

diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c
index e8c9ef03495b..33edd6766344 100644
--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -559,7 +559,8 @@ static void edac_mc_workq_function(struct work_struct *work_req)
  *
  *              called with the mem_ctls_mutex held
  */
-static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec)
+static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec,
+                                bool init)
 {
         edac_dbg(0, "\n");
 
@@ -567,7 +568,9 @@ static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec)
         if (mci->op_state != OP_RUNNING_POLL)
                 return;
 
-        INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function);
+        if (init)
+                INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function);
+
         mod_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec));
 }
 
@@ -601,7 +604,7 @@ static void edac_mc_workq_teardown(struct mem_ctl_info *mci)
  *      user space has updated our poll period value, need to
  *      reset our workq delays
  */
-void edac_mc_reset_delay_period(int value)
+void edac_mc_reset_delay_period(unsigned long value)
 {
         struct mem_ctl_info *mci;
         struct list_head *item;
@@ -611,7 +614,7 @@ void edac_mc_reset_delay_period(int value)
         list_for_each(item, &mc_devices) {
                 mci = list_entry(item, struct mem_ctl_info, link);
 
-                edac_mc_workq_setup(mci, (unsigned long) value);
+                edac_mc_workq_setup(mci, value, false);
         }
 
         mutex_unlock(&mem_ctls_mutex);
@@ -782,7 +785,7 @@ int edac_mc_add_mc(struct mem_ctl_info *mci)
                 /* This instance is NOW RUNNING */
                 mci->op_state = OP_RUNNING_POLL;
 
-                edac_mc_workq_setup(mci, edac_mc_get_poll_msec());
+                edac_mc_workq_setup(mci, edac_mc_get_poll_msec(), true);
         } else {
                 mci->op_state = OP_RUNNING_INTERRUPT;
         }
diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
index 8ec1747b1c39..b335c6ab5efe 100644
--- a/drivers/edac/edac_mc_sysfs.c
+++ b/drivers/edac/edac_mc_sysfs.c
@@ -52,18 +52,20 @@ int edac_mc_get_poll_msec(void)
 
 static int edac_set_poll_msec(const char *val, struct kernel_param *kp)
 {
-        long l;
+        unsigned long l;
         int ret;
 
         if (!val)
                 return -EINVAL;
 
-        ret = kstrtol(val, 0, &l);
+        ret = kstrtoul(val, 0, &l);
         if (ret)
                 return ret;
-        if (!l || ((int)l != l))
+
+        if (l < 1000)
                 return -EINVAL;
-        *((int *)kp->arg) = l;
+
+        *((unsigned long *)kp->arg) = l;
 
         /* notify edac_mc engine to reset the poll period */
         edac_mc_reset_delay_period(l);
diff --git a/drivers/edac/edac_module.h b/drivers/edac/edac_module.h
index 3d139c6e7fe3..f2118bfcf8df 100644
--- a/drivers/edac/edac_module.h
+++ b/drivers/edac/edac_module.h
@@ -52,7 +52,7 @@ extern void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
 extern void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev);
 extern void edac_device_reset_delay_period(struct edac_device_ctl_info
                                            *edac_dev, unsigned long value);
-extern void edac_mc_reset_delay_period(int value);
+extern void edac_mc_reset_delay_period(unsigned long value);
 
 extern void *edac_align_ptr(void **p, unsigned size, int n_elems);