[PATCH 4.4 014/163] xhci: fix 10 second timeout on removal of PCI hotpluggable xhci controllers

Greg Kroah-Hartman
2016-05-03T01:54:04Z

From: Mathias Nyman <mathias.nyman@linux.intel.com>

commit 98d74f9ceaefc2b6c4a6440050163a83be0abede upstream.

PCI hotpluggable xhci controllers such as some Alpine Ridge solutions will
remove the xhci controller from the PCI bus when the last USB device is
disconnected.

Add a flag to indicate that the host is being removed to avoid queueing
configure_endpoint commands for the dropped endpoints.
For PCI hotplugged controllers this will prevent 5 second command timeouts
For static xhci controllers the configure_endpoint command is not needed
in the removal case as everything will be returned, freed, and the
controller is reset.

For now the flag is only set for PCI connected host controllers.

Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/usb/host/xhci-pci.c | 1 +
drivers/usb/host/xhci-ring.c | 3 ++-
drivers/usb/host/xhci.c | 8 +++++---
drivers/usb/host/xhci.h | 1 +
4 files changed, 9 insertions(+), 4 deletions(-)

--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -301,6 +301,7 @@ static void xhci_pci_remove(struct pci_d
struct xhci_hcd *xhci;

xhci = hcd_to_xhci(pci_get_drvdata(dev));
+ xhci->xhc_state |= XHCI_STATE_REMOVING;
if (xhci->shared_hcd) {
usb_remove_hcd(xhci->shared_hcd);
usb_put_hcd(xhci->shared_hcd);
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -4008,7 +4008,8 @@ static int queue_command(struct xhci_hcd
int reserved_trbs = xhci->cmd_ring_reserved_trbs;
int ret;

- if (xhci->xhc_state) {
+ if ((xhci->xhc_state & XHCI_STATE_DYING) ||
+ (xhci->xhc_state & XHCI_STATE_HALTED)) {
xhci_dbg(xhci, "xHCI dying or halted, can't queue_command\n");
return -ESHUTDOWN;
}
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -146,7 +146,8 @@ static int xhci_start(struct xhci_hcd *x
"waited %u microseconds.\n",
XHCI_MAX_HALT_USEC);
if (!ret)
- xhci->xhc_state &= ~(XHCI_STATE_HALTED | XHCI_STATE_DYING);
+ /* clear state flags. Including dying, halted or removing */
+ xhci->xhc_state = 0;

return ret;
}
@@ -2753,7 +2754,8 @@ int xhci_check_bandwidth(struct usb_hcd
if (ret <= 0)
return ret;
xhci = hcd_to_xhci(hcd);
- if (xhci->xhc_state & XHCI_STATE_DYING)
+ if ((xhci->xhc_state & XHCI_STATE_DYING) ||
+ (xhci->xhc_state & XHCI_STATE_REMOVING))
return -ENODEV;

xhci_dbg(xhci, "%s called for udev %p\n", __func__, udev);
@@ -3800,7 +3802,7 @@ static int xhci_setup_device(struct usb_

mutex_lock(&xhci->mutex);

- if (xhci->xhc_state) /* dying or halted */
+ if (xhci->xhc_state) /* dying, removing or halted */
goto out;

if (!udev->slot_id) {
--- a/drivers/usb/host/xhci.h
+++ b/drivers/usb/host/xhci.h
@@ -1596,6 +1596,7 @@ struct xhci_hcd {
*/
#define XHCI_STATE_DYING (1 << 0)
#define XHCI_STATE_HALTED (1 << 1)
+#define XHCI_STATE_REMOVING (1 << 2)
/* Statistics */
int error_bitmask;
unsigned int quirks;