From 04538a255ac8b404c20cbf15867c9829254c470f Mon Sep 17 00:00:00 2001 From: Alan Stern Date: Fri, 12 May 2006 11:29:04 -0400 Subject: [PATCH] [PATCH] UHCI: Eliminate the TD-removal list This patch (as682) gets rid of the TD-removal list in uhci-hcd. It is no longer needed because now TDs are not freed until we know the hardware isn't using them. It also simplifies the code for adding and removing TDs to/from URBs. Signed-off-by: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/uhci-hcd.c | 1 - drivers/usb/host/uhci-hcd.h | 5 -- drivers/usb/host/uhci-q.c | 92 +++++++++++-------------------------- 3 files changed, 27 insertions(+), 71 deletions(-) diff --git a/drivers/usb/host/uhci-hcd.c b/drivers/usb/host/uhci-hcd.c index d225e11f4055..fb4c1a8cadf4 100644 --- a/drivers/usb/host/uhci-hcd.c +++ b/drivers/usb/host/uhci-hcd.c @@ -492,7 +492,6 @@ static int uhci_start(struct usb_hcd *hcd) spin_lock_init(&uhci->lock); - INIT_LIST_HEAD(&uhci->td_remove_list); INIT_LIST_HEAD(&uhci->idle_qh_list); init_waitqueue_head(&uhci->waitqh); diff --git a/drivers/usb/host/uhci-hcd.h b/drivers/usb/host/uhci-hcd.h index 3093ca250942..90ef7fbbf2fb 100644 --- a/drivers/usb/host/uhci-hcd.h +++ b/drivers/usb/host/uhci-hcd.h @@ -228,7 +228,6 @@ struct uhci_td { dma_addr_t dma_handle; struct list_head list; - struct list_head remove_list; int frame; /* for iso: what frame? */ struct list_head fl_list; @@ -420,10 +419,6 @@ struct uhci_hcd { unsigned long resuming_ports; unsigned long ports_timeout; /* Time to stop signalling */ - /* List of TDs that are done, but waiting to be freed (race) */ - struct list_head td_remove_list; - unsigned int td_remove_age; /* Age in frames */ - struct list_head idle_qh_list; /* Where the idle QHs live */ int rh_numports; /* Number of root-hub ports */ diff --git a/drivers/usb/host/uhci-q.c b/drivers/usb/host/uhci-q.c index 64b6c74789fd..12af6fb05a30 100644 --- a/drivers/usb/host/uhci-q.c +++ b/drivers/usb/host/uhci-q.c @@ -16,7 +16,6 @@ * (C) Copyright 2004-2005 Alan Stern, stern@rowland.harvard.edu */ -static void uhci_free_pending_tds(struct uhci_hcd *uhci); /* * Technically, updating td->status here is a race, but it's not really a @@ -51,7 +50,6 @@ static struct uhci_td *uhci_alloc_td(struct uhci_hcd *uhci) td->frame = -1; INIT_LIST_HEAD(&td->list); - INIT_LIST_HEAD(&td->remove_list); INIT_LIST_HEAD(&td->fl_list); return td; @@ -61,8 +59,6 @@ static void uhci_free_td(struct uhci_hcd *uhci, struct uhci_td *td) { if (!list_empty(&td->list)) dev_warn(uhci_dev(uhci), "td %p still in list!\n", td); - if (!list_empty(&td->remove_list)) - dev_warn(uhci_dev(uhci), "td %p still in remove_list!\n", td); if (!list_empty(&td->fl_list)) dev_warn(uhci_dev(uhci), "td %p still in fl_list!\n", td); @@ -77,6 +73,16 @@ static inline void uhci_fill_td(struct uhci_td *td, u32 status, td->buffer = cpu_to_le32(buffer); } +static void uhci_add_td_to_urbp(struct uhci_td *td, struct urb_priv *urbp) +{ + list_add_tail(&td->list, &urbp->td_list); +} + +static void uhci_remove_td_from_urbp(struct uhci_td *td) +{ + list_del_init(&td->list); +} + /* * We insert Isochronous URBs directly into the frame list at the beginning */ @@ -421,21 +427,6 @@ static inline struct urb_priv *uhci_alloc_urb_priv(struct uhci_hcd *uhci, return urbp; } -static void uhci_add_td_to_urb(struct urb *urb, struct uhci_td *td) -{ - struct urb_priv *urbp = (struct urb_priv *)urb->hcpriv; - - list_add_tail(&td->list, &urbp->td_list); -} - -static void uhci_remove_td_from_urb(struct uhci_td *td) -{ - if (list_empty(&td->list)) - return; - - list_del_init(&td->list); -} - static void uhci_free_urb_priv(struct uhci_hcd *uhci, struct urb_priv *urbp) { @@ -445,20 +436,9 @@ static void uhci_free_urb_priv(struct uhci_hcd *uhci, dev_warn(uhci_dev(uhci), "urb %p still on QH's list!\n", urbp->urb); - uhci_get_current_frame_number(uhci); - if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) { - uhci_free_pending_tds(uhci); - uhci->td_remove_age = uhci->frame_number; - } - - /* Check to see if the remove list is empty. Set the IOC bit */ - /* to force an interrupt so we can remove the TDs. */ - if (list_empty(&uhci->td_remove_list)) - uhci_set_next_interrupt(uhci); - list_for_each_entry_safe(td, tmp, &urbp->td_list, list) { - uhci_remove_td_from_urb(td); - list_add(&td->remove_list, &uhci->td_remove_list); + uhci_remove_td_from_urbp(td); + uhci_free_td(uhci, td); } urbp->urb->hcpriv = NULL; @@ -529,6 +509,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, int len = urb->transfer_buffer_length; dma_addr_t data = urb->transfer_dma; __le32 *plink; + struct urb_priv *urbp = urb->hcpriv; /* The "pipe" thing contains the destination in bits 8--18 */ destination = (urb->pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP; @@ -542,7 +523,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, * Build the TD for the control request setup packet */ td = qh->dummy_td; - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status, destination | uhci_explen(8), urb->setup_dma); plink = &td->link; @@ -574,7 +555,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, /* Alternate Data0/1 (start with Data1) */ destination ^= TD_TOKEN_TOGGLE; - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status, destination | uhci_explen(pktsze), data); plink = &td->link; @@ -605,7 +586,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, status &= ~TD_CTRL_SPD; - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status | TD_CTRL_IOC, destination | uhci_explen(0), 0); plink = &td->link; @@ -640,7 +621,7 @@ static int uhci_submit_control(struct uhci_hcd *uhci, struct urb *urb, nomem: /* Remove the dummy TD from the td_list so it doesn't get freed */ - uhci_remove_td_from_urb(qh->dummy_td); + uhci_remove_td_from_urbp(qh->dummy_td); return -ENOMEM; } @@ -656,6 +637,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, int len = urb->transfer_buffer_length; dma_addr_t data = urb->transfer_dma; __le32 *plink; + struct urb_priv *urbp = urb->hcpriv; unsigned int toggle; if (len < 0) @@ -693,7 +675,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, goto nomem; *plink = cpu_to_le32(td->dma_handle); } - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status, destination | uhci_explen(pktsze) | (toggle << TD_TOKEN_TOGGLE_SHIFT), @@ -721,7 +703,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, goto nomem; *plink = cpu_to_le32(td->dma_handle); - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status, destination | uhci_explen(0) | (toggle << TD_TOKEN_TOGGLE_SHIFT), @@ -758,7 +740,7 @@ static int uhci_submit_common(struct uhci_hcd *uhci, struct urb *urb, nomem: /* Remove the dummy TD from the td_list so it doesn't get freed */ - uhci_remove_td_from_urb(qh->dummy_td); + uhci_remove_td_from_urbp(qh->dummy_td); return -ENOMEM; } @@ -830,8 +812,8 @@ static int uhci_fixup_short_transfer(struct uhci_hcd *uhci, td = list_entry(tmp, struct uhci_td, list); tmp = tmp->prev; - uhci_remove_td_from_urb(td); - list_add(&td->remove_list, &uhci->td_remove_list); + uhci_remove_td_from_urbp(td); + uhci_free_td(uhci, td); } return ret; } @@ -885,10 +867,9 @@ static int uhci_result_common(struct uhci_hcd *uhci, struct urb *urb) ret = 1; } - uhci_remove_td_from_urb(td); + uhci_remove_td_from_urbp(td); if (qh->post_td) - list_add(&qh->post_td->remove_list, - &uhci->td_remove_list); + uhci_free_td(uhci, qh->post_td); qh->post_td = td; if (ret != 0) @@ -957,7 +938,7 @@ static int uhci_submit_isochronous(struct uhci_hcd *uhci, struct urb *urb, if (!td) return -ENOMEM; - uhci_add_td_to_urb(urb, td); + uhci_add_td_to_urbp(td, urbp); uhci_fill_td(td, status, destination | uhci_explen(urb->iso_frame_desc[i].length), urb->transfer_dma + @@ -1267,17 +1248,6 @@ restart: uhci_make_qh_idle(uhci, qh); } -static void uhci_free_pending_tds(struct uhci_hcd *uhci) -{ - struct uhci_td *td, *tmp; - - list_for_each_entry_safe(td, tmp, &uhci->td_remove_list, remove_list) { - list_del_init(&td->remove_list); - - uhci_free_td(uhci, td); - } -} - /* * Process events in the schedule, but only in one thread at a time */ @@ -1298,9 +1268,6 @@ static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs) uhci_clear_next_interrupt(uhci); uhci_get_current_frame_number(uhci); - if (uhci->frame_number + uhci->is_stopped != uhci->td_remove_age) - uhci_free_pending_tds(uhci); - /* Go through all the QH queues and process the URBs in each one */ for (i = 0; i < UHCI_NUM_SKELQH - 1; ++i) { uhci->next_qh = list_entry(uhci->skelqh[i]->node.next, @@ -1316,12 +1283,7 @@ static void uhci_scan_schedule(struct uhci_hcd *uhci, struct pt_regs *regs) goto rescan; uhci->scan_in_progress = 0; - /* If the controller is stopped, we can finish these off right now */ - if (uhci->is_stopped) - uhci_free_pending_tds(uhci); - - if (list_empty(&uhci->td_remove_list) && - list_empty(&uhci->skel_unlink_qh->node)) + if (list_empty(&uhci->skel_unlink_qh->node)) uhci_clear_next_interrupt(uhci); else uhci_set_next_interrupt(uhci); -- 2.30.2