linux-kernel - [RFCv2 05/10] xhci: use command structure for xhci_queue_new_dequeue

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Date:	Thu, 30 Jan 2014 16:10:22 +0200
From:	Mathias Nyman <mathias.nyman@...ux.intel.com>
To:	<linux-usb@...r.kernel.org>
Cc:	<sarah.a.sharp@...ux.intel.com>, <dan.j.williams@...el.com>,
	<linux-kernel@...r.kernel.org>,
	Mathias Nyman <mathias.nyman@...ux.intel.com>
Subject: [RFCv2 05/10] xhci: use command structure for xhci_queue_new_dequeue_state()

Prepare for the global command ring by using command structures
internally in functions calling xhci_queue_new_dequeue_state()

Signed-off-by: Mathias Nyman <mathias.nyman@...ux.intel.com>
---
 drivers/usb/host/xhci-ring.c | 3 +++
 drivers/usb/host/xhci.c      | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c
index da83a844..df5b0f8 100644
--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -855,11 +855,14 @@ remove_finished_td:
 
 	/* If necessary, queue a Set Transfer Ring Dequeue Pointer command */
 	if (deq_state.new_deq_ptr && deq_state.new_deq_seg) {
+		struct xhci_command *command;
+		command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC);
 		xhci_queue_new_dequeue_state(xhci,
 				slot_id, ep_index,
 				ep->stopped_td->urb->stream_id,
 				&deq_state);
 		xhci_ring_cmd_db(xhci);
+		kfree(command);
 	} else {
 		/* Otherwise ring the doorbell(s) to restart queued transfers */
 		ring_doorbell_for_active_rings(xhci, slot_id, ep_index);
diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c
index d4684d0..0c3f0bc 100644
--- a/drivers/usb/host/xhci.c
+++ b/drivers/usb/host/xhci.c
@@ -2869,10 +2869,16 @@ void xhci_cleanup_stalled_ring(struct xhci_hcd *xhci,
 	 * issue a configure endpoint command later.
 	 */
 	if (!(xhci->quirks & XHCI_RESET_EP_QUIRK)) {
+		struct xhci_command *command;
+		/* Can't sleep if we're called from cleanup_halted_endpoint() */
+		command = xhci_alloc_command(xhci, false, false, GFP_ATOMIC);
+		if (!command)
+			return;
 		xhci_dbg_trace(xhci, trace_xhci_dbg_reset_ep,
 				"Queueing new dequeue state");
 		xhci_queue_new_dequeue_state(xhci, udev->slot_id,
 				ep_index, ep->stopped_stream, &deq_state);
+		kfree(command);
 	} else {
 		/* Better hope no one uses the input context between now and the
 		 * reset endpoint completion!
-- 
1.8.1.2

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