aboutsummaryrefslogtreecommitdiff
path: root/drivers/usb/host/xhci-hub.c
diff options
context:
space:
mode:
authorSarah Sharp <sarah.a.sharp@linux.intel.com>2010-10-29 14:37:23 -0700
committerSarah Sharp <sarah.a.sharp@linux.intel.com>2011-03-13 18:23:44 -0700
commitf9de8151877b4f01cc8e124b0e213a6c6c78d970 (patch)
treefa1fb7231c83430c098f20511ab99909fe1c2544 /drivers/usb/host/xhci-hub.c
parentd30b2a208108a0b0fdeae7006b8824d9be16ca96 (diff)
downloadlinux-linaro-stable-f9de8151877b4f01cc8e124b0e213a6c6c78d970.tar.gz
xhci: Make roothub functions deal with device removal.
Return early in the roothub control and status functions if the xHCI host controller is not electrically present in the system (register reads return all "fs"). This issue only shows up when the xHCI driver registers two roothubs and the host controller is removed from the system. Signed-off-by: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Diffstat (limited to 'drivers/usb/host/xhci-hub.c')
-rw-r--r--drivers/usb/host/xhci-hub.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/usb/host/xhci-hub.c b/drivers/usb/host/xhci-hub.c
index 191ebc54cc7d..770f84cb7327 100644
--- a/drivers/usb/host/xhci-hub.c
+++ b/drivers/usb/host/xhci-hub.c
@@ -418,6 +418,10 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
wIndex--;
status = 0;
temp = xhci_readl(xhci, port_array[wIndex]);
+ if (temp == 0xffffffff) {
+ retval = -ENODEV;
+ break;
+ }
xhci_dbg(xhci, "get port status, actual port %d status = 0x%x\n", wIndex, temp);
/* FIXME - should we return a port status value like the USB
@@ -492,6 +496,10 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
goto error;
wIndex--;
temp = xhci_readl(xhci, port_array[wIndex]);
+ if (temp == 0xffffffff) {
+ retval = -ENODEV;
+ break;
+ }
temp = xhci_port_state_to_neutral(temp);
/* FIXME: What new port features do we need to support? */
switch (wValue) {
@@ -562,6 +570,10 @@ int xhci_hub_control(struct usb_hcd *hcd, u16 typeReq, u16 wValue,
goto error;
wIndex--;
temp = xhci_readl(xhci, port_array[wIndex]);
+ if (temp == 0xffffffff) {
+ retval = -ENODEV;
+ break;
+ }
/* FIXME: What new port features do we need to support? */
temp = xhci_port_state_to_neutral(temp);
switch (wValue) {
@@ -677,6 +689,10 @@ int xhci_hub_status_data(struct usb_hcd *hcd, char *buf)
/* For each port, did anything change? If so, set that bit in buf. */
for (i = 0; i < ports; i++) {
temp = xhci_readl(xhci, port_array[i]);
+ if (temp == 0xffffffff) {
+ retval = -ENODEV;
+ break;
+ }
if ((temp & mask) != 0 ||
(bus_state->port_c_suspend & 1 << i) ||
(bus_state->resume_done[i] && time_after_eq(