mfd: Fix twl6030 lockdep recursion warning on setting wake IRQs

LOCKDEP explicitly sets all irq_desc locks as a single lock-class,
causing "possible recursive locking detected" when the TWL RTC
driver calls through enable_irq_wake to twl6030_irq_set_wake,
which recursively calls irq_set_irq_wake.  Although the
irq_desc and lock are different, LOCKDEP treats these as
equivalent, presumably due to problems that can be incurred
when locking more than one irq_desc, so best to avoid this.

Suspend/resume actions implemented as PM notifiers to avoid
touch the TWL core for this.

Signed-off-by: Todd Poynor <toddpoynor@google.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

diff --git a/drivers/mfd/twl6030-irq.c b/drivers/mfd/twl6030-irq.c
index a17b423..a014ec4 100644 (file)
--- a/drivers/mfd/twl6030-irq.c
+++ b/drivers/mfd/twl6030-irq.c
@@ -37,6 +37,7 @@
 #include <linux/kthread.h>
 #include <linux/i2c/twl.h>
 #include <linux/platform_device.h>
+#include <linux/suspend.h>
 
 #include "twl-core.h"
 
@@ -83,8 +84,42 @@ static int twl6030_interrupt_mapping[24] = {
 /*----------------------------------------------------------------------*/
 
 static unsigned twl6030_irq_base;
+static int twl_irq;
+static bool twl_irq_wake_enabled;
 
 static struct completion irq_event;
+static atomic_t twl6030_wakeirqs = ATOMIC_INIT(0);
+
+static int twl6030_irq_pm_notifier(struct notifier_block *notifier,
+                                  unsigned long pm_event, void *unused)
+{
+       int chained_wakeups;
+
+       switch (pm_event) {
+       case PM_SUSPEND_PREPARE:
+               chained_wakeups = atomic_read(&twl6030_wakeirqs);
+
+               if (chained_wakeups && !twl_irq_wake_enabled) {
+                       if (enable_irq_wake(twl_irq))
+                               pr_err("twl6030 IRQ wake enable failed\n");
+                       else
+                               twl_irq_wake_enabled = true;
+               } else if (!chained_wakeups && twl_irq_wake_enabled) {
+                       disable_irq_wake(twl_irq);
+                       twl_irq_wake_enabled = false;
+               }
+
+               break;
+       default:
+               break;
+       }
+
+       return NOTIFY_DONE;
+}
+
+static struct notifier_block twl6030_irq_pm_notifier_block = {
+       .notifier_call = twl6030_irq_pm_notifier,
+};
 
 /*
  * This thread processes interrupts reported by the Primary Interrupt Handler.
@@ -189,9 +224,12 @@ static inline void activate_irq(int irq)
 
 int twl6030_irq_set_wake(struct irq_data *d, unsigned int on)
 {
-       int twl_irq = (int)irq_get_chip_data(d->irq);
+       if (on)
+               atomic_inc(&twl6030_wakeirqs);
+       else
+               atomic_dec(&twl6030_wakeirqs);
 
-       return irq_set_irq_wake(twl_irq, on);
+       return 0;
 }
 
 /*----------------------------------------------------------------------*/
@@ -354,6 +392,9 @@ int twl6030_init_irq(int irq_num, unsigned irq_base, unsigned irq_end)
                status = PTR_ERR(task);
                goto fail_kthread;
        }
+
+       twl_irq = irq_num;
+       register_pm_notifier(&twl6030_irq_pm_notifier_block);
        return status;
 
 fail_kthread:
@@ -367,6 +408,7 @@ fail_irq:
 
 int twl6030_exit_irq(void)
 {
+       unregister_pm_notifier(&twl6030_irq_pm_notifier_block);
 
        if (twl6030_irq_base) {
                pr_err("twl6030: can't yet clean up IRQs?\n");