gpio-pch: add spinlock in suspend/resume processing

Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pch.c b/drivers/gpio/gpio-pch.c
index ca9c7b051e07..252bddbd3f44 100644
--- a/drivers/gpio/gpio-pch.c
+++ b/drivers/gpio/gpio-pch.c
@@ -55,6 +55,9 @@ struct pch_gpio_reg_data {
  * @gpio:                       Data for GPIO infrastructure.
  * @pch_gpio_reg:               Memory mapped Register data is saved here
  *                              when suspend.
+ * @spinlock:           Used for register access protection in
+ *                              interrupt context pch_irq_mask,
+ *                              pch_irq_unmask and pch_irq_type;
  */
 struct pch_gpio {
         void __iomem *base;
@@ -63,6 +66,7 @@ struct pch_gpio {
         struct gpio_chip gpio;
         struct pch_gpio_reg_data pch_gpio_reg;
         struct mutex lock;
+        spinlock_t spinlock;
 };
 
 static void pch_gpio_set(struct gpio_chip *gpio, unsigned nr, int val)
@@ -239,8 +243,11 @@ static int pch_gpio_suspend(struct pci_dev *pdev, pm_message_t state)
 {
         s32 ret;
         struct pch_gpio *chip = pci_get_drvdata(pdev);
+        unsigned long flags;
 
+        spin_lock_irqsave(&chip->spinlock, flags);
         pch_gpio_save_reg_conf(chip);
+        spin_unlock_irqrestore(&chip->spinlock, flags);
 
         ret = pci_save_state(pdev);
         if (ret) {
@@ -260,6 +267,7 @@ static int pch_gpio_resume(struct pci_dev *pdev)
 {
         s32 ret;
         struct pch_gpio *chip = pci_get_drvdata(pdev);
+        unsigned long flags;
 
         ret = pci_enable_wake(pdev, PCI_D0, 0);
 
@@ -271,9 +279,11 @@ static int pch_gpio_resume(struct pci_dev *pdev)
         }
         pci_restore_state(pdev);
 
+        spin_lock_irqsave(&chip->spinlock, flags);
         iowrite32(0x01, &chip->reg->reset);
         iowrite32(0x00, &chip->reg->reset);
         pch_gpio_restore_reg_conf(chip);
+        spin_unlock_irqrestore(&chip->spinlock, flags);
 
         return 0;
 }