From: Aubrey Li Date: Mon, 21 May 2007 10:09:38 +0000 (+0800) Subject: Blackfin serial driver: fix overhead issue X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=5c4e472b0af57553f9584e0b33c491b168ac1dff;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git Blackfin serial driver: fix overhead issue Signed-off-by: Aubrey Li Signed-off-by: Bryan Wu Signed-off-by: Linus Torvalds --- 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);