From 7e64b0373af50fa46d3bf441f1c079615bbdf77f Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Mon, 23 Jan 2017 14:20:26 +0200 Subject: [PATCH] xhci: simplify how we store TDs in urb private data Instead of storing a zero length array of td pointers, and then allocate memory both for the td pointer array and the td's, just use a zero length array of actual td's in urb private data. old: struct urb_priv { struct xhci_td *td[0] } new: struct urb_priv { struct xhci_td td[0] } Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-mem.c | 5 +---- drivers/usb/host/xhci-ring.c | 20 ++++++++++---------- drivers/usb/host/xhci.c | 24 ++++++------------------ drivers/usb/host/xhci.h | 2 +- 4 files changed, 18 insertions(+), 33 deletions(-) diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index e452492d8071..ba1853f4e407 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -1817,10 +1817,7 @@ struct xhci_command *xhci_alloc_command(struct xhci_hcd *xhci, void xhci_urb_free_priv(struct urb_priv *urb_priv) { - if (urb_priv) { - kfree(urb_priv->td[0]); - kfree(urb_priv); - } + kfree(urb_priv); } void xhci_free_command(struct xhci_hcd *xhci, diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 7a7040680c56..d9936c771fa0 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -2838,7 +2838,7 @@ static int prepare_transfer(struct xhci_hcd *xhci, return ret; urb_priv = urb->hcpriv; - td = urb_priv->td[td_index]; + td = &urb_priv->td[td_index]; INIT_LIST_HEAD(&td->td_list); INIT_LIST_HEAD(&td->cancelled_td_list); @@ -3134,7 +3134,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, if (urb->transfer_flags & URB_ZERO_PACKET && urb_priv->num_tds > 1) need_zero_pkt = true; - td = urb_priv->td[0]; + td = &urb_priv->td[0]; /* * Don't give the first TRB to the hardware (by toggling the cycle bit) @@ -3227,7 +3227,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, ret = prepare_transfer(xhci, xhci->devs[slot_id], ep_index, urb->stream_id, 1, urb, 1, mem_flags); - urb_priv->td[1]->last_trb = ring->enqueue; + urb_priv->td[1].last_trb = ring->enqueue; field = TRB_TYPE(TRB_NORMAL) | ring->cycle_state | TRB_IOC; queue_trb(xhci, ring, 0, 0, 0, TRB_INTR_TARGET(0), field); } @@ -3279,7 +3279,7 @@ int xhci_queue_ctrl_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return ret; urb_priv = urb->hcpriv; - td = urb_priv->td[0]; + td = &urb_priv->td[0]; /* * Don't give the first TRB to the hardware (by toggling the cycle bit) @@ -3567,7 +3567,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, return ret; goto cleanup; } - td = urb_priv->td[i]; + td = &urb_priv->td[i]; /* use SIA as default, if frame id is used overwrite it */ sia_frame_id = TRB_SIA; @@ -3674,20 +3674,20 @@ cleanup: /* Clean up a partially enqueued isoc transfer. */ for (i--; i >= 0; i--) - list_del_init(&urb_priv->td[i]->td_list); + list_del_init(&urb_priv->td[i].td_list); /* Use the first TD as a temporary variable to turn the TDs we've queued * into No-ops with a software-owned cycle bit. That way the hardware * won't accidentally start executing bogus TDs when we partially * overwrite them. td->first_trb and td->start_seg are already set. */ - urb_priv->td[0]->last_trb = ep_ring->enqueue; + urb_priv->td[0].last_trb = ep_ring->enqueue; /* Every TRB except the first & last will have its cycle bit flipped. */ - td_to_noop(xhci, ep_ring, urb_priv->td[0], true); + td_to_noop(xhci, ep_ring, &urb_priv->td[0], true); /* Reset the ring enqueue back to the first TRB and its cycle bit. */ - ep_ring->enqueue = urb_priv->td[0]->first_trb; - ep_ring->enq_seg = urb_priv->td[0]->start_seg; + ep_ring->enqueue = urb_priv->td[0].first_trb; + ep_ring->enq_seg = urb_priv->td[0].start_seg; ep_ring->cycle_state = start_cycle; ep_ring->num_trbs_free = ep_ring->num_trbs_free_temp; usb_hcd_unlink_urb_from_ep(bus_to_hcd(urb->dev->bus), urb); diff --git a/drivers/usb/host/xhci.c b/drivers/usb/host/xhci.c index bee6272b9bfd..dde5c2da0d7a 100644 --- a/drivers/usb/host/xhci.c +++ b/drivers/usb/host/xhci.c @@ -1332,12 +1332,11 @@ command_cleanup: int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) { struct xhci_hcd *xhci = hcd_to_xhci(hcd); - struct xhci_td *buffer; unsigned long flags; int ret = 0; unsigned int slot_id, ep_index; struct urb_priv *urb_priv; - int num_tds, i; + int num_tds; if (!urb || xhci_check_args(hcd, urb->dev, urb->ep, true, true, __func__) <= 0) @@ -1364,21 +1363,10 @@ int xhci_urb_enqueue(struct usb_hcd *hcd, struct urb *urb, gfp_t mem_flags) num_tds = 1; urb_priv = kzalloc(sizeof(struct urb_priv) + - num_tds * sizeof(struct xhci_td *), mem_flags); + num_tds * sizeof(struct xhci_td), mem_flags); if (!urb_priv) return -ENOMEM; - buffer = kzalloc(num_tds * sizeof(struct xhci_td), mem_flags); - if (!buffer) { - kfree(urb_priv); - return -ENOMEM; - } - - for (i = 0; i < num_tds; i++) { - urb_priv->td[i] = buffer; - buffer++; - } - urb_priv->num_tds = num_tds; urb_priv->num_tds_done = 0; urb->hcpriv = urb_priv; @@ -1526,7 +1514,7 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) for (i = urb_priv->num_tds_done; i < urb_priv->num_tds && xhci->devs[urb->dev->slot_id]; i++) { - td = urb_priv->td[i]; + td = &urb_priv->td[i]; if (!list_empty(&td->td_list)) list_del_init(&td->td_list); if (!list_empty(&td->cancelled_td_list)) @@ -1557,11 +1545,11 @@ int xhci_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status) urb, urb->dev->devpath, urb->ep->desc.bEndpointAddress, (unsigned long long) xhci_trb_virt_to_dma( - urb_priv->td[i]->start_seg, - urb_priv->td[i]->first_trb)); + urb_priv->td[i].start_seg, + urb_priv->td[i].first_trb)); for (; i < urb_priv->num_tds; i++) { - td = urb_priv->td[i]; + td = &urb_priv->td[i]; list_add_tail(&td->cancelled_td_list, &ep->cancelled_td_list); } diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index dab271995aca..da3eb695fe54 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1610,7 +1610,7 @@ struct xhci_scratchpad { struct urb_priv { int num_tds; int num_tds_done; - struct xhci_td *td[0]; + struct xhci_td td[0]; }; /* -- 2.39.5