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authorAubrey Li <aubrey.li@analog.com>2007-05-21 18:09:38 +0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-21 09:50:23 -0700
commit5c4e472b0af57553f9584e0b33c491b168ac1dff (patch)
tree5719717c4aa23ba8deca7e2d43d9ef7278268341 /drivers/serial
parent9d7b6677ac35fdfee93e8f50589e04bcc95649c1 (diff)
downloadop-kernel-dev-5c4e472b0af57553f9584e0b33c491b168ac1dff.zip
op-kernel-dev-5c4e472b0af57553f9584e0b33c491b168ac1dff.tar.gz
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/serial')
-rw-r--r--drivers/serial/bfin_5xx.c28
1 files changed, 17 insertions, 11 deletions
diff --git a/drivers/serial/bfin_5xx.c b/drivers/serial/bfin_5xx.c
index 408390f..a8271d9 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);
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