On 2013年02月28日 15:57, Li Fei wrote:
>
> Even in failed case of pm_runtime_get_sync, the usage_count
> is incremented. In order to keep the usage_count with correct
> value and runtime power management to behave correctly, call
> pm_runtime_put(_sync) in such case.
Hi Fei:
It's not necessary. Because the did_runtime_put == true means the
port's usage count has already been decreased during
usb_port_suspend().So to keep usage count balance, we should increase
the usage count in the usb_port_resume() whatever.
>
> Signed-off-by Liu Chuansheng <chuansheng.liu@xxxxxxxxx>
> Signed-off-by: Li Fei <fei.li@xxxxxxxxx>
> ---
> drivers/usb/core/hub.c | 1 +
> 1 files changed, 1 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
> index 5480352..b68493b 100644
> --- a/drivers/usb/core/hub.c
> +++ b/drivers/usb/core/hub.c
> @@ -3152,6 +3152,7 @@ int usb_port_resume(struct usb_device *udev, pm_message_t msg)
> if (status < 0) {
> dev_dbg(&udev->dev, "can't resume usb port, status %d\n",
> status);
> + pm_runtime_put_sync(&port_dev->dev);
> return status;
> }
> }
>
Hi Alan:
Further thinking, the device should be disconnected since the port
can't be resumed and the device will not work normally. Something like
following. Does this make sense?
---
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index d5d3de4..cf36b11 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3170,6 +3170,7 @@ int usb_port_resume(struct usb_device *udev,
pm_message_t msg)
if (status < 0) {
dev_dbg(&udev->dev, "can't resume usb port,
status %d\n",
status);
+ hub_port_logical_disconnect(hub, port1);
return status;
}
}
--
Best regards
Tianyu Lan
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