diff options
| author | Aubrey Li <aubrey.li@analog.com> | 2007-05-21 18:09:38 +0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-21 09:50:23 -0700 |
| commit | 5c4e472b0af57553f9584e0b33c491b168ac1dff (patch) | |
| tree | 5719717c4aa23ba8deca7e2d43d9ef7278268341 /drivers | |
| parent | 9d7b6677ac35fdfee93e8f50589e04bcc95649c1 (diff) | |
| download | lwn-5c4e472b0af57553f9584e0b33c491b168ac1dff.tar.gz lwn-5c4e472b0af57553f9584e0b33c491b168ac1dff.zip | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/serial/bfin_5xx.c | 28 |
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c index 408390f93db9..a8271d9c6202 100644 --- a/drivers/serial/bfin_5xx.c +++ b/drivers/serial/bfin_5xx.c @@ -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); |