[PATCH 1/2] PM/runtime: fix comment for rpm_suspend

[PATCH 1/2] PM/runtime: fix comment for rpm_suspend

[ming.lei]

From: Ming Lei <ming.lei@canonical.com>

This patch fix comments for rpm_suspend:

- 'Cancel a pending idle notification' should be put before, also
should be changed as 'Cancel a pending idle notification,
autosuspend or suspend'

- after suspend succeeded, idle notification for the device has
been removed, so update comment for it

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/base/power/runtime.c |   18 ++++++++++--------
 1 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index 7a6fb5e..aa23a64 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -286,14 +286,16 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
  * @dev: Device to suspend.
  * @rpmflags: Flag bits.
  *
- * Check if the device's runtime PM status allows it to be suspended.  If
- * another suspend has been started earlier, either return immediately or wait
- * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags.  Cancel a
- * pending idle notification.  If the RPM_ASYNC flag is set then queue a
- * suspend request; otherwise run the ->runtime_suspend() callback directly.
- * If a deferred resume was requested while the callback was running then carry
- * it out; otherwise send an idle notification for the device (if the suspend
- * failed) or for its parent (if the suspend succeeded).
+ * Check if the device's runtime PM status allows it to be suspended.
+ * Cancel a pending idle notification, autosuspend or suspend. If
+ * another suspend has been started earlier, either return immediately
+ * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC
+ * flags. If the RPM_ASYNC flag is set then queue a suspend request;
+ * otherwise run the ->runtime_suspend() callback directly. If a deferred
+ * resume was requested while the callback was running then carry it out;
+ * otherwise send an idle notification for its parent (if the suspend
+ * succeeded and both ignore_children of parent->power and irq_safe of
+ * dev->power are not set).
  *
  * This function must be called under dev->power.lock with interrupts disabled.
  */
-- 
1.7.5.4

[PATCH 2/2] PM/runtime: handle ->runtime_suspend failure correctly

[ming.lei]

From: Ming Lei <ming.lei@canonical.com>

If ->runtime_suspend returns -EAGAIN or -EBUSY, the device should
still be in ACTIVE state, so it is not needed to send idle notification
to its parent; if ->runtime_suspend returns other fatal failure, it
doesn't make sense to send idle notification to its parent.

So skip these when failure is returned from ->runtime_suspend, also
update comments for this handling in rpm_suspend.

Signed-off-by: Ming Lei <ming.lei@canonical.com>
---
 drivers/base/power/runtime.c |   25 +++++++++++++------------
 1 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
index aa23a64..6bb3aaf 100644
--- a/drivers/base/power/runtime.c
+++ b/drivers/base/power/runtime.c
@@ -291,11 +291,11 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
  * another suspend has been started earlier, either return immediately
  * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC
  * flags. If the RPM_ASYNC flag is set then queue a suspend request;
- * otherwise run the ->runtime_suspend() callback directly. If a deferred
- * resume was requested while the callback was running then carry it out;
- * otherwise send an idle notification for its parent (if the suspend
- * succeeded and both ignore_children of parent->power and irq_safe of
- * dev->power are not set).
+ * otherwise run the ->runtime_suspend() callback directly. When
+ * ->runtime_suspend succeeded, if a deferred resume was requested while
+ * the callback was running then carry it out, otherwise send an idle
+ * notification for its parent (if the suspend succeeded and both
+ * ignore_children of parent->power and irq_safe of dev->power are not set).
  *
  * This function must be called under dev->power.lock with interrupts disabled.
  */
@@ -420,15 +420,16 @@ static int rpm_suspend(struct device *dev, int rpmflags)
 			dev->power.runtime_error = 0;
 		else
 			pm_runtime_cancel_pending(dev);
-	} else {
+		wake_up_all(&dev->power.wait_queue);
+		goto out;
+	}
  no_callback:
-		__update_runtime_status(dev, RPM_SUSPENDED);
-		pm_runtime_deactivate_timer(dev);
+	__update_runtime_status(dev, RPM_SUSPENDED);
+	pm_runtime_deactivate_timer(dev);
 
-		if (dev->parent) {
-			parent = dev->parent;
-			atomic_add_unless(&parent->power.child_count, -1, 0);
-		}
+	if (dev->parent) {
+		parent = dev->parent;
+		atomic_add_unless(&parent->power.child_count, -1, 0);
 	}
 	wake_up_all(&dev->power.wait_queue);
 
-- 
1.7.5.4

Re: [PATCH 1/2] PM/runtime: fix comment for rpm_suspend

[Rafael J. Wysocki]

On Wednesday, October 12, 2011, ming.lei@canonical.com wrote:
> From: Ming Lei <ming.lei@canonical.com>
> 
> This patch fix comments for rpm_suspend:
> 
> - 'Cancel a pending idle notification' should be put before, also
> should be changed as 'Cancel a pending idle notification,
> autosuspend or suspend'
> 
> - after suspend succeeded, idle notification for the device has
> been removed, so update comment for it
> 
> Signed-off-by: Ming Lei <ming.lei@canonical.com>

Both patches applied to linux-pm/linux-next.

Thanks,
Rafael


> ---
>  drivers/base/power/runtime.c |   18 ++++++++++--------
>  1 files changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/base/power/runtime.c b/drivers/base/power/runtime.c
> index 7a6fb5e..aa23a64 100644
> --- a/drivers/base/power/runtime.c
> +++ b/drivers/base/power/runtime.c
> @@ -286,14 +286,16 @@ static int rpm_callback(int (*cb)(struct device *), struct device *dev)
>   * @dev: Device to suspend.
>   * @rpmflags: Flag bits.
>   *
> - * Check if the device's runtime PM status allows it to be suspended.  If
> - * another suspend has been started earlier, either return immediately or wait
> - * for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC flags.  Cancel a
> - * pending idle notification.  If the RPM_ASYNC flag is set then queue a
> - * suspend request; otherwise run the ->runtime_suspend() callback directly.
> - * If a deferred resume was requested while the callback was running then carry
> - * it out; otherwise send an idle notification for the device (if the suspend
> - * failed) or for its parent (if the suspend succeeded).
> + * Check if the device's runtime PM status allows it to be suspended.
> + * Cancel a pending idle notification, autosuspend or suspend. If
> + * another suspend has been started earlier, either return immediately
> + * or wait for it to finish, depending on the RPM_NOWAIT and RPM_ASYNC
> + * flags. If the RPM_ASYNC flag is set then queue a suspend request;
> + * otherwise run the ->runtime_suspend() callback directly. If a deferred
> + * resume was requested while the callback was running then carry it out;
> + * otherwise send an idle notification for its parent (if the suspend
> + * succeeded and both ignore_children of parent->power and irq_safe of
> + * dev->power are not set).
>   *
>   * This function must be called under dev->power.lock with interrupts disabled.
>   */
>