Patch "EDAC: Fix workqueues poll period resetting" has been added to the 4.6-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    EDAC: Fix workqueues poll period resetting

to the 4.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     edac-fix-workqueues-poll-period-resetting.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From fbedcaf43fba35677c01a4ae51e6f79edf4049ba Mon Sep 17 00:00:00 2001
From: Nicholas Krause <xerofoify@gmail.com>
Date: Thu, 19 May 2016 18:45:58 -0400
Subject: EDAC: Fix workqueues poll period resetting

From: Nicholas Krause <xerofoify@gmail.com>

commit fbedcaf43fba35677c01a4ae51e6f79edf4049ba upstream.

After the workqueue cleanup, we're registering workqueues based on
the presence of an ->edac_check function. When that is the case,
we're setting OP_RUNNING_POLL. But we forgot to check that in
edac_mc_reset_delay_period(), leading to:

  BUG: unable to handle kernel paging request at 0000000000015d10
  IP: [ .. ] queued_spin_lock_slowpath
  PGD 3ffcc8067 PUD 3ffc56067 PMD 0
  Oops: 0002 [#1] SMP
  Modules linked in: ...
  CPU: 1 PID: 2792 Comm: edactest Not tainted 4.6.0-dirty #1
  Hardware name: HP ProLiant MicroServer, BIOS O41     10/01/2013
  Stack:
  Call Trace:
    ? _raw_spin_lock_irqsave
    ? lock_timer_base.isra.34
    ? del_timer
    ? try_to_grab_pending
    ? mod_delayed_work_on
    ? edac_mc_reset_delay_period
    ? edac_set_poll_msec
    ? param_attr_store
    ? module_attr_store
    ? kernfs_fop_write
    ? __vfs_write
    ? __vfs_read
    ? __alloc_fd
    ? vfs_write
    ? SyS_write
    ? entry_SYSCALL_64_fastpath
  Code:
  RIP  [ .. ] queued_spin_lock_slowpath
   RSP <>
  CR2: 0000000000015d10
  ---[ end trace 3f286bc71cca15d1 ]---
  Kernel panic - not syncing: Fatal exception

Fix it.

Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/1463697958-13406-1-git-send-email-xerofoify@gmail.com
[ Rewrite commit message. ]
Signed-off-by: Borislav Petkov <bp@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/edac/edac_mc.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/edac/edac_mc.c
+++ b/drivers/edac/edac_mc.c
@@ -565,7 +565,8 @@ void edac_mc_reset_delay_period(unsigned
 	list_for_each(item, &mc_devices) {
 		mci = list_entry(item, struct mem_ctl_info, link);
 
-		edac_mod_work(&mci->work, value);
+		if (mci->op_state == OP_RUNNING_POLL)
+			edac_mod_work(&mci->work, value);
 	}
 	mutex_unlock(&mem_ctls_mutex);
 }


Patches currently in stable-queue which might be from xerofoify@gmail.com are

queue-4.6/edac-fix-workqueues-poll-period-resetting.patch