Revision 2709781be6141798162f1089df728fb218a590df authored by Ben Dooks on 01 July 2008, 10:59:41 UTC, committed by Ben Dooks on 01 July 2008, 13:30:37 UTC
We should check for the reception of an ACK after transmitting each data byte. The address send has been correctly checking this, but the data write byte state should have also been checking for these failures. As part of the same fix, we remove the ACK checking from the receive path where it should not have been checking for an ACK which our hardware was sending. Signed-off-by: Ben Dooks <ben-linux@fluff.org>
1 parent e1441b9
plist.c
/*
* lib/plist.c
*
* Descending-priority-sorted double-linked list
*
* (C) 2002-2003 Intel Corp
* Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>.
*
* 2001-2005 (c) MontaVista Software, Inc.
* Daniel Walker <dwalker@mvista.com>
*
* (C) 2005 Thomas Gleixner <tglx@linutronix.de>
*
* Simplifications of the original code by
* Oleg Nesterov <oleg@tv-sign.ru>
*
* Licensed under the FSF's GNU Public License v2 or later.
*
* Based on simple lists (include/linux/list.h).
*
* This file contains the add / del functions which are considered to
* be too large to inline. See include/linux/plist.h for further
* information.
*/
#include <linux/plist.h>
#include <linux/spinlock.h>
#ifdef CONFIG_DEBUG_PI_LIST
static void plist_check_prev_next(struct list_head *t, struct list_head *p,
struct list_head *n)
{
if (n->prev != p || p->next != n) {
printk("top: %p, n: %p, p: %p\n", t, t->next, t->prev);
printk("prev: %p, n: %p, p: %p\n", p, p->next, p->prev);
printk("next: %p, n: %p, p: %p\n", n, n->next, n->prev);
WARN_ON(1);
}
}
static void plist_check_list(struct list_head *top)
{
struct list_head *prev = top, *next = top->next;
plist_check_prev_next(top, prev, next);
while (next != top) {
prev = next;
next = prev->next;
plist_check_prev_next(top, prev, next);
}
}
static void plist_check_head(struct plist_head *head)
{
WARN_ON(!head->lock);
if (head->lock)
WARN_ON_SMP(!spin_is_locked(head->lock));
plist_check_list(&head->prio_list);
plist_check_list(&head->node_list);
}
#else
# define plist_check_head(h) do { } while (0)
#endif
/**
* plist_add - add @node to @head
*
* @node: &struct plist_node pointer
* @head: &struct plist_head pointer
*/
void plist_add(struct plist_node *node, struct plist_head *head)
{
struct plist_node *iter;
plist_check_head(head);
WARN_ON(!plist_node_empty(node));
list_for_each_entry(iter, &head->prio_list, plist.prio_list) {
if (node->prio < iter->prio)
goto lt_prio;
else if (node->prio == iter->prio) {
iter = list_entry(iter->plist.prio_list.next,
struct plist_node, plist.prio_list);
goto eq_prio;
}
}
lt_prio:
list_add_tail(&node->plist.prio_list, &iter->plist.prio_list);
eq_prio:
list_add_tail(&node->plist.node_list, &iter->plist.node_list);
plist_check_head(head);
}
/**
* plist_del - Remove a @node from plist.
*
* @node: &struct plist_node pointer - entry to be removed
* @head: &struct plist_head pointer - list head
*/
void plist_del(struct plist_node *node, struct plist_head *head)
{
plist_check_head(head);
if (!list_empty(&node->plist.prio_list)) {
struct plist_node *next = plist_first(&node->plist);
list_move_tail(&next->plist.prio_list, &node->plist.prio_list);
list_del_init(&node->plist.prio_list);
}
list_del_init(&node->plist.node_list);
plist_check_head(head);
}
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