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Fix polling timeout setting through sysfs.

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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 79040cad3f ("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
This commit is contained in:
Linus Torvalds 2014-02-14 11:05:41 -08:00
commit 3bd354abe1
3 changed files with 15 additions and 10 deletions
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13
drivers/edac/edac_mc.c
View file

@ -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;
}

10
drivers/edac/edac_mc_sysfs.c
View file

@ -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);

2
drivers/edac/edac_module.h
View file

@ -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);