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solos: Clean up handling of card->tx_mask a little

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Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-01-29 14:08:27 +11:00
parent c6428e52fa
commit 35c2221ba1
1 changed files with 27 additions and 24 deletions
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51
drivers/atm/solos-pci.c
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@ -140,7 +140,7 @@ module_param(fpga_upgrade, int, 0444);
static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
struct atm_vcc *vcc);
static int fpga_tx(struct solos_card *);
static uint32_t fpga_tx(struct solos_card *);
static irqreturn_t solos_irq(int irq, void *dev_id);
static struct atm_vcc* find_vcc(struct atm_dev *dev, short vpi, int vci);
static int list_vccs(int vci);
@ -438,8 +438,6 @@ static int send_command(struct solos_card *card, int dev, const char *buf, size_
struct sk_buff *skb;
struct pkt_hdr *header;
// dev_dbg(&card->dev->dev, "size: %d\n", size);
if (size > (BUF_SIZE - sizeof(*header))) {
dev_dbg(&card->dev->dev, "Command is too big. Dropping request\n");
return 0;
@ -574,9 +572,9 @@ static irqreturn_t solos_irq(int irq, void *dev_id)
struct solos_card *card = dev_id;
int handled = 1;
//ACK IRQ
iowrite32(0, card->config_regs + IRQ_CLEAR);
/* If we're up and running, just kick the tasklet to process TX/RX */
if (card->atmdev[0])
tasklet_schedule(&card->tlet);
else
@ -588,16 +586,16 @@ static irqreturn_t solos_irq(int irq, void *dev_id)
void solos_bh(unsigned long card_arg)
{
struct solos_card *card = (void *)card_arg;
int port;
uint32_t card_flags;
uint32_t rx_done = 0;
int port;
card_flags = ioread32(card->config_regs + FLAGS_ADDR);
/* The TX bits are set if the channel is busy; clear if not. We want to
invoke fpga_tx() unless _all_ the bits for active channels are set */
if ((card_flags & card->tx_mask) != card->tx_mask)
fpga_tx(card);
/*
* Since fpga_tx() is going to need to read the flags under its lock,
* it can return them to us so that we don't have to hit PCI MMIO
* again for the same information
*/
card_flags = fpga_tx(card);
for (port = 0; port < card->nr_ports; port++) {
if (card_flags & (0x10 << port)) {
@ -892,9 +890,8 @@ static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
spin_lock_irqsave(&card->tx_queue_lock, flags);
old_len = skb_queue_len(&card->tx_queue[port]);
skb_queue_tail(&card->tx_queue[port], skb);
if (!old_len) {
if (!old_len)
card->tx_mask |= (1 << port);
}
spin_unlock_irqrestore(&card->tx_queue_lock, flags);
/* Theoretically we could just schedule the tasklet here, but
@ -903,9 +900,9 @@ static void fpga_queue(struct solos_card *card, int port, struct sk_buff *skb,
fpga_tx(card);
}
static int fpga_tx(struct solos_card *card)
static uint32_t fpga_tx(struct solos_card *card)
{
uint32_t tx_pending;
uint32_t tx_pending, card_flags;
uint32_t tx_started = 0;
struct sk_buff *skb;
struct atm_vcc *vcc;
@ -913,19 +910,24 @@ static int fpga_tx(struct solos_card *card)
unsigned long flags;
spin_lock_irqsave(&card->tx_lock, flags);
card_flags = ioread32(card->config_regs + FLAGS_ADDR);
/*
* The queue lock is required for _writing_ to tx_mask, but we're
* OK to read it here without locking. The only potential update
* that we could race with is in fpga_queue() where it sets a bit
* for a new port... but it's going to call this function again if
* it's doing that, anyway.
*/
tx_pending = card->tx_mask & ~card_flags;
tx_pending = ioread32(card->config_regs + FLAGS_ADDR) & card->tx_mask;
dev_vdbg(&card->dev->dev, "TX Flags are %X\n", tx_pending);
for (port = 0; port < card->nr_ports; port++) {
if (card->atmdev[port] && !(tx_pending & (1 << port))) {
for (port = 0; tx_pending; tx_pending >>= 1, port++) {
if (tx_pending & 1) {
struct sk_buff *oldskb = card->tx_skb[port];
if (oldskb)
pci_unmap_single(card->dev, SKB_CB(oldskb)->dma_addr,
oldskb->len, PCI_DMA_TODEVICE);
spin_lock(&card->tx_queue_lock);
skb = skb_dequeue(&card->tx_queue[port]);
if (!skb)
@ -966,8 +968,9 @@ static int fpga_tx(struct solos_card *card)
if (tx_started)
iowrite32(tx_started, card->config_regs + FLAGS_ADDR);
out:
spin_unlock_irqrestore(&card->tx_lock, flags);
return 0;
return card_flags;
}
static int psend(struct atm_vcc *vcc, struct sk_buff *skb)