USB autosuspend suspends vhci_hcd. In this process hcd_bus_suspend gets
executed which puts vhci_hcd in suspend state and calls vhci_hub_status.
vhci_hub_status function checks hub state and if it is in suspend state,
usb_hcd_resume_root_hub gets executed which resumes hub
and if hub is idle, again autosuspend puts it in suspend state and this goes on.
vhci_hub_status should resume hub only when hub port is in suspend state and
hub port status has changed.
Signed-off-by: navin patidar <nav...@cdac.in>
---
drivers/staging/usbip/vhci_hcd.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/usbip/vhci_hcd.c b/drivers/staging/usbip/vhci_hcd.c
index 12a9a5f..6076f42 100644
--- a/drivers/staging/usbip/vhci_hcd.c
+++ b/drivers/staging/usbip/vhci_hcd.c
@@ -220,7 +220,7 @@ static int vhci_hub_status(struct usb_hcd *hcd, char *buf)
pr_info("changed %d\n", changed);
- if (hcd->state == HC_STATE_SUSPENDED)
+ if ((hcd->state == HC_STATE_SUSPENDED) && (changed == 1))
usb_hcd_resume_root_hub(hcd);
done:
--
1.7.9.5
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