rtc-spear: fix for balancing the enable_irq_wake in Power Mgmt

Handle the fix for unbalanced irq for the cases when enable_irq_wake
fails, and a warning related to same is displayed on the console.  The
workaround is handled at the driver level.

Signed-off-by: Deepak Sikri <deepak.sikri@st.com>
Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Acked-by: Rajeev Kumar <rajeev-dlh.kumar@st.com>
Cc: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 6 deletions

diff --git a/drivers/rtc/rtc-spear.c b/drivers/rtc/rtc-spear.c
index 19a28a671a8e..4f068e9ec0f8 100644
--- a/drivers/rtc/rtc-spear.c
+++ b/drivers/rtc/rtc-spear.c
@@ -80,6 +80,7 @@ struct spear_rtc_config {
         struct clk *clk;
         spinlock_t lock;
         void __iomem *ioaddr;
+        unsigned int irq_wake;
 };
 
 static inline void spear_rtc_clear_interrupt(struct spear_rtc_config *config)
@@ -463,9 +464,10 @@ static int spear_rtc_suspend(struct platform_device *pdev, pm_message_t state)
         int irq;
 
         irq = platform_get_irq(pdev, 0);
-        if (device_may_wakeup(&pdev->dev))
-                enable_irq_wake(irq);
-        else {
+        if (device_may_wakeup(&pdev->dev)) {
+                if (!enable_irq_wake(irq))
+                        config->irq_wake = 1;
+        } else {
                 spear_rtc_disable_interrupt(config);
                 clk_disable(config->clk);
         }
@@ -481,9 +483,12 @@ static int spear_rtc_resume(struct platform_device *pdev)
 
         irq = platform_get_irq(pdev, 0);
 
-        if (device_may_wakeup(&pdev->dev))
-                disable_irq_wake(irq);
-        else {
+        if (device_may_wakeup(&pdev->dev)) {
+                if (config->irq_wake) {
+                        disable_irq_wake(irq);
+                        config->irq_wake = 0;
+                }
+        } else {
                 clk_enable(config->clk);
                 spear_rtc_enable_interrupt(config);
         }