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path: root/drivers/net/ipa/ipa_power.c
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Diffstat (limited to 'drivers/net/ipa/ipa_power.c')
-rw-r--r--drivers/net/ipa/ipa_power.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/net/ipa/ipa_power.c b/drivers/net/ipa/ipa_power.c
index 8420f93128a2..8057be8cda80 100644
--- a/drivers/net/ipa/ipa_power.c
+++ b/drivers/net/ipa/ipa_power.c
@@ -181,6 +181,17 @@ static int ipa_suspend(struct device *dev)
__set_bit(IPA_POWER_FLAG_SYSTEM, ipa->power->flags);
+ /* Increment the disable depth to ensure that the IRQ won't
+ * be re-enabled until the matching _enable call in
+ * ipa_resume(). We do this to ensure that the interrupt
+ * handler won't run whilst PM runtime is disabled.
+ *
+ * Note that disabling the IRQ is NOT the same as disabling
+ * irq wake. If wakeup is enabled for the IPA then the IRQ
+ * will still cause the system to wake up, see irq_set_irq_wake().
+ */
+ ipa_interrupt_irq_disable(ipa);
+
return pm_runtime_force_suspend(dev);
}
@@ -193,6 +204,12 @@ static int ipa_resume(struct device *dev)
__clear_bit(IPA_POWER_FLAG_SYSTEM, ipa->power->flags);
+ /* Now that PM runtime is enabled again it's safe
+ * to turn the IRQ back on and process any data
+ * that was received during suspend.
+ */
+ ipa_interrupt_irq_enable(ipa);
+
return ret;
}