Patch "pinctrl: single: Fix missing flush of posted write for a wakeirq" has been added to the 4.4-stable tree

Patch "pinctrl: single: Fix missing flush of posted write for a wakeirq" has been added to the 4.4-stable tree

[gregkh]

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

    pinctrl: single: Fix missing flush of posted write for a wakeirq

to the 4.4-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:
     pinctrl-single-fix-missing-flush-of-posted-write-for-a-wakeirq.patch
and it can be found in the queue-4.4 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 0ac3c0a4025f41748a083bdd4970cb3ede802b15 Mon Sep 17 00:00:00 2001
From: Tony Lindgren <tony@atomide.com>
Date: Tue, 31 May 2016 14:17:06 -0700
Subject: pinctrl: single: Fix missing flush of posted write for a wakeirq

From: Tony Lindgren <tony@atomide.com>

commit 0ac3c0a4025f41748a083bdd4970cb3ede802b15 upstream.

With many repeated suspend resume cycles, the pin specific wakeirq
may not always work on omaps. This is because the write to enable the
pin interrupt may not have reached the device over the interconnect
before suspend happens.

Let's fix the issue with a flush of posted write with a readback.

Reported-by: Nishanth Menon <nm@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pinctrl/pinctrl-single.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -1576,6 +1576,9 @@ static inline void pcs_irq_set(struct pc
 		else
 			mask &= ~soc_mask;
 		pcs->write(mask, pcswi->reg);
+
+		/* flush posted write */
+		mask = pcs->read(pcswi->reg);
 		raw_spin_unlock(&pcs->lock);
 	}
 


Patches currently in stable-queue which might be from tony@atomide.com are

queue-4.4/pinctrl-single-fix-missing-flush-of-posted-write-for-a-wakeirq.patch