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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>
hifive-unleashed-5.1
Tomoya MORINAGA 2011-07-21 09:19:55 +09:00 committed by Grant Likely
parent 829e8256f1
commit d568a6814f
1 changed files with 10 additions and 0 deletions
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10
drivers/gpio/gpio-pch.c
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@ -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;
}