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Commit f9cb8c74 authored by Mathias Nyman's avatar Mathias Nyman Committed by Chandana Kishori Chiluveru
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xhci: fix 10 second timeout on removal of PCI hotpluggable xhci controllers 



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.

Change-Id: Ic0b58b6be29d3c797b21ef5637e4004d08cc0b5c
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarMathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Git-commit: 98d74f9ceaefc2b6c4a6440050163a83be0abede
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


[cchiluve@codeaurora.org: resovle merge conflicts]
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent 450bd44d

drivers/usb/host/xhci-pci.c

+1 −0
Original line number Diff line number Diff line
@@ -281,6 +281,7 @@ static void xhci_pci_remove(struct pci_dev *dev) 
	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);

drivers/usb/host/xhci-ring.c

+3 −1
Original line number Diff line number Diff line
@@ -3936,7 +3936,9 @@ static int queue_command(struct xhci_hcd *xhci, struct xhci_command *cmd, 
{

	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;

	}

drivers/usb/host/xhci.c

+6 −3
Original line number Diff line number Diff line
@@ -156,7 +156,9 @@ static int xhci_start(struct xhci_hcd *xhci) 
				"waited %u microseconds.\n",

				XHCI_MAX_HALT_USEC);

	if (!ret)

		xhci->xhc_state &= ~XHCI_STATE_HALTED;

		/* clear state flags. Including dying, halted or removing */

		xhci->xhc_state = 0;



	return ret;

}
@@ -2769,7 +2771,8 @@ int xhci_check_bandwidth(struct usb_hcd *hcd, struct usb_device *udev) 
	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);
@@ -3815,7 +3818,7 @@ static int xhci_setup_device(struct usb_hcd *hcd, struct usb_device *udev, 


	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) {

drivers/usb/host/xhci.h

+1 −0
Original line number Diff line number Diff line
@@ -1533,6 +1533,7 @@ 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;