The commit 37be66767e3c ("usb: hub: Fix auto-remount of safely removed
or ejected USB-3 devices") causes the following error when we
disconnected a usb 3.0 device on some environment (e.g. R-Car H3):
xhci-hcd ee000000.usb: Cannot set link state.
usb usb8-port1: cannot disable (err = -32)
According to Figure 35 in xhci spec, the PED (PORT_PE) will
be set to 0 after the usb3 root hub enters "Error" or "Disconnected"
state. So, this patch avoids the error messages to return -ENODEV when
asked to set the USB_PORT_FEAT_LINK_STATE feature to U3 and PORT_PE
was clear.
Suggested-by: Mathias Nyman <mathias.nyman@xxxxxxxxxxxxxxx>
Suggested-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@xxxxxxxxxxx>
---
drivers/usb/host/xhci-hub.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 2a90229..7e95f9e 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -1229,8 +1229,11 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
* port link state above '3' (U3) and the port
* must be enabled.
*/
- if ((temp & PORT_PE) == 0 ||
- (link_state > USB_SS_PORT_LS_U3)) {
+ if ((temp & PORT_PE) == 0) {
+ retval = -ENODEV;
+ break;
+ }
+ if (link_state > USB_SS_PORT_LS_U3) {
xhci_warn(xhci, "Cannot set link state.\n");
goto error;
}
--
1.9.1
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