[3.8.y.z extended stable] Patch "mfd: rtsx_pcr: Disable interrupts before cancelling delayed works" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    mfd: rtsx_pcr: Disable interrupts before cancelling delayed works

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.16.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From b1ca2ae0b3b55152efe6e1bee0fd91061027bd35 Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx at linutronix.de>
Date: Mon, 2 Dec 2013 12:20:36 +0100
Subject: mfd: rtsx_pcr: Disable interrupts before cancelling delayed works

commit 73beb63d290f961c299526852884846b0d868840 upstream.

This fixes a kernel panic when resuming from suspend to RAM.
Without this fix an interrupt hits after the delayed work is canceled
and thus requeues it. So we end up freeing an armed timer.

Signed-off-by: Thomas Gleixner <tglx at linutronix.de>
Signed-off-by: Samuel Ortiz <sameo at linux.intel.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/mfd/rtsx_pcr.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c
index 148aa18..0c0a84d 100644
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -1188,8 +1188,14 @@ static void rtsx_pci_remove(struct pci_dev *pcidev)

 	pcr->remove_pci = true;

-	cancel_delayed_work(&pcr->carddet_work);
-	cancel_delayed_work(&pcr->idle_work);
+	/* Disable interrupts at the pcr level */
+	spin_lock_irq(&pcr->lock);
+	rtsx_pci_writel(pcr, RTSX_BIER, 0);
+	pcr->bier = 0;
+	spin_unlock_irq(&pcr->lock);
+
+	cancel_delayed_work_sync(&pcr->carddet_work);
+	cancel_delayed_work_sync(&pcr->idle_work);

 	mfd_remove_devices(&pcidev->dev);

--
1.8.3.2