linux-kernel - [PATCH 4.9 08/66] pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq

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Message-Id: <20170207124528.656894489@linuxfoundation.org>
Date:   Tue,  7 Feb 2017 13:58:42 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH 4.9 08/66] pinctrl: baytrail: Add missing spinlock usage in byt_gpio_irq_handler

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Alexander Stein <alexander.stein@...tec-electronic.com>

commit cdca06e4e85974d8a3503ab15709dbbaf90d3dd1 upstream.

According to VLI64 Intel Atom E3800 Specification Update (#329901)
concurrent read accesses may result in returning 0xffffffff and write
accesses may be dropped silently.
To workaround all accesses must be protected by locks.

Signed-off-by: Alexander Stein <alexander.stein@...tec-electronic.com>
Acked-by: Mika Westerberg <mika.westerberg@...ux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/pinctrl/intel/pinctrl-baytrail.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1612,7 +1612,9 @@ static void byt_gpio_irq_handler(struct
 			continue;
 		}
 
+		raw_spin_lock(&vg->lock);
 		pending = readl(reg);
+		raw_spin_unlock(&vg->lock);
 		for_each_set_bit(pin, &pending, 32) {
 			virq = irq_find_mapping(vg->chip.irqdomain, base + pin);
 			generic_handle_irq(virq);