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Blackfin serial driver: fix overhead issue 

Signed-off-by: Aubrey Li <aubrey.li@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Aubrey Li 2007-05-21 18:09:38 +08:00 committed by Linus Torvalds
parent 9d7b6677ac
commit 5c4e472b0a
1 changed files with 17 additions and 11 deletions
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28
drivers/serial/bfin_5xx.c
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@ -240,24 +240,30 @@ static void bfin_serial_tx_chars(struct bfin_serial_port *uart)
bfin_serial_stop_tx(&uart->port);
}
static irqreturn_t bfin_serial_int(int irq, void *dev_id)
static irqreturn_t bfin_serial_rx_int(int irq, void *dev_id)
{
struct bfin_serial_port *uart = dev_id;
spin_lock(&uart->port.lock);
while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_RX_READY)
bfin_serial_rx_chars(uart);
spin_unlock(&uart->port.lock);
return IRQ_HANDLED;
}
static irqreturn_t bfin_serial_tx_int(int irq, void *dev_id)
{
struct bfin_serial_port *uart = dev_id;
unsigned short status;
spin_lock(&uart->port.lock);
status = UART_GET_IIR(uart);
do {
if ((status & IIR_STATUS) == IIR_TX_READY)
bfin_serial_tx_chars(uart);
if ((status & IIR_STATUS) == IIR_RX_READY)
bfin_serial_rx_chars(uart);
status = UART_GET_IIR(uart);
} while (status & (IIR_TX_READY | IIR_RX_READY));
while ((UART_GET_IIR(uart) & IIR_STATUS) == IIR_TX_READY)
bfin_serial_tx_chars(uart);
spin_unlock(&uart->port.lock);
return IRQ_HANDLED;
}
static void bfin_serial_do_work(struct work_struct *work)
{
struct bfin_serial_port *uart = container_of(work, struct bfin_serial_port, cts_workqueue);
@ -545,14 +551,14 @@ static int bfin_serial_startup(struct uart_port *port)
add_timer(&(uart->rx_dma_timer));
#else
if (request_irq
(uart->port.irq, bfin_serial_int, IRQF_DISABLED,
(uart->port.irq, bfin_serial_rx_int, IRQF_DISABLED,
"BFIN_UART_RX", uart)) {
printk(KERN_NOTICE "Unable to attach BlackFin UART RX interrupt\n");
return -EBUSY;
}
if (request_irq
(uart->port.irq+1, bfin_serial_int, IRQF_DISABLED,
(uart->port.irq+1, bfin_serial_tx_int, IRQF_DISABLED,
"BFIN_UART_TX", uart)) {
printk(KERN_NOTICE "Unable to attach BlackFin UART TX interrupt\n");
free_irq(uart->port.irq, uart);