hi all:
For HW bug, we have to mdelay(100) in getting root hub port status.
But it suffer system performance.
(The place we need to add is like below)
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 388cfd8..9a6b841 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -760,6 +760,7 @@ int xhci_hub_control(struct usb_hcd *hcd, u16
typeReq, u16 wValue,
retval = -ENODEV;
break;
}
+ mdelay(100);
status = xhci_get_port_status(hcd, bus_state, port_array,
wIndex, temp, flags);
if (status == 0xffffffff)
Then I try to use msleep(100) but I found hub_port_status will first
mutex_lock(&hub->status_mutex); then calling get_port_status.
That mean the deadlock may happen.
Is there any better way to do so?
appreciate your kind help in advance,
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