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[CASSINI]: Revert 'dont touch page_count'. 

This reverts changeset fa4f0774d7
([CASSINI]: dont touch page_count) because it breaks the driver.

The local page counting added by this changeset did not account
for the asynchronous page count changes done by kfree_skb()
and friends.

The change adds extra atomics and on top of it all appears to be
totally unnecessary as well.

Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Nick Piggin <npiggin@suse.de>
This commit is contained in:
David S. Miller 2008-01-03 19:33:50 -08:00
parent e5e025401f
commit 9de4dfb4c7
1 changed files with 4 additions and 32 deletions
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36
drivers/net/cassini.c
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@ -336,30 +336,6 @@ static inline void cas_mask_intr(struct cas *cp)
cas_disable_irq(cp, i);
}
static inline void cas_buffer_init(cas_page_t *cp)
{
struct page *page = cp->buffer;
atomic_set((atomic_t *)&page->lru.next, 1);
}
static inline int cas_buffer_count(cas_page_t *cp)
{
struct page *page = cp->buffer;
return atomic_read((atomic_t *)&page->lru.next);
}
static inline void cas_buffer_inc(cas_page_t *cp)
{
struct page *page = cp->buffer;
atomic_inc((atomic_t *)&page->lru.next);
}
static inline void cas_buffer_dec(cas_page_t *cp)
{
struct page *page = cp->buffer;
atomic_dec((atomic_t *)&page->lru.next);
}
static void cas_enable_irq(struct cas *cp, const int ring)
{
if (ring == 0) { /* all but TX_DONE */
@ -497,7 +473,6 @@ static int cas_page_free(struct cas *cp, cas_page_t *page)
{
pci_unmap_page(cp->pdev, page->dma_addr, cp->page_size,
PCI_DMA_FROMDEVICE);
cas_buffer_dec(page);
__free_pages(page->buffer, cp->page_order);
kfree(page);
return 0;
@ -527,7 +502,6 @@ static cas_page_t *cas_page_alloc(struct cas *cp, const gfp_t flags)
page->buffer = alloc_pages(flags, cp->page_order);
if (!page->buffer)
goto page_err;
cas_buffer_init(page);
page->dma_addr = pci_map_page(cp->pdev, page->buffer, 0,
cp->page_size, PCI_DMA_FROMDEVICE);
return page;
@ -606,7 +580,7 @@ static void cas_spare_recover(struct cas *cp, const gfp_t flags)
list_for_each_safe(elem, tmp, &list) {
cas_page_t *page = list_entry(elem, cas_page_t, list);
if (cas_buffer_count(page) > 1)
if (page_count(page->buffer) > 1)
continue;
list_del(elem);
@ -1374,7 +1348,7 @@ static inline cas_page_t *cas_page_spare(struct cas *cp, const int index)
cas_page_t *page = cp->rx_pages[1][index];
cas_page_t *new;
if (cas_buffer_count(page) == 1)
if (page_count(page->buffer) == 1)
return page;
new = cas_page_dequeue(cp);
@ -1394,7 +1368,7 @@ static cas_page_t *cas_page_swap(struct cas *cp, const int ring,
cas_page_t **page1 = cp->rx_pages[1];
/* swap if buffer is in use */
if (cas_buffer_count(page0[index]) > 1) {
if (page_count(page0[index]->buffer) > 1) {
cas_page_t *new = cas_page_spare(cp, index);
if (new) {
page1[index] = page0[index];
@ -2066,7 +2040,6 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
skb->len += hlen - swivel;
get_page(page->buffer);
cas_buffer_inc(page);
frag->page = page->buffer;
frag->page_offset = off;
frag->size = hlen - swivel;
@ -2091,7 +2064,6 @@ static int cas_rx_process_pkt(struct cas *cp, struct cas_rx_comp *rxc,
frag++;
get_page(page->buffer);
cas_buffer_inc(page);
frag->page = page->buffer;
frag->page_offset = 0;
frag->size = hlen;
@ -2255,7 +2227,7 @@ static int cas_post_rxds_ringN(struct cas *cp, int ring, int num)
released = 0;
while (entry != last) {
/* make a new buffer if it's still in use */
if (cas_buffer_count(page[entry]) > 1) {
if (page_count(page[entry]->buffer) > 1) {
cas_page_t *new = cas_page_dequeue(cp);
if (!new) {
/* let the timer know that we need to