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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2006-01-04 19:19:06 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2006-01-04 19:19:06 +0000
commit45e24601921fc1c4ca7932f7f7a475d3ad64ecad (patch)
tree21b64ad15abe3b051a0462096ee2474212274e20 /drivers/serial
parent50aec3b561de4e435204ad315e5c5ab58ef9feda (diff)
downloadop-kernel-dev-45e24601921fc1c4ca7932f7f7a475d3ad64ecad.zip
op-kernel-dev-45e24601921fc1c4ca7932f7f7a475d3ad64ecad.tar.gz
[SERIAL] Move interrupt-time spinlocking inside serial8250_handle_port()
All call sites for serial8250_handle_port() acquired the port spinlock and released it afterwards. This is a needless duplication of code. Move the spinlocking inside serial8250_handle_port(). Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'drivers/serial')
-rw-r--r--drivers/serial/8250.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index ad20d2d..56dcfd9 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -1281,7 +1281,11 @@ static unsigned int check_modem_status(struct uart_8250_port *up)
static inline void
serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
{
- unsigned int status = serial_inp(up, UART_LSR);
+ unsigned int status;
+
+ spin_lock(&up->port.lock);
+
+ status = serial_inp(up, UART_LSR);
DEBUG_INTR("status = %x...", status);
@@ -1290,6 +1294,8 @@ serial8250_handle_port(struct uart_8250_port *up, struct pt_regs *regs)
check_modem_status(up);
if (status & UART_LSR_THRE)
transmit_chars(up);
+
+ spin_unlock(&up->port.lock);
}
/*
@@ -1325,9 +1331,7 @@ static irqreturn_t serial8250_interrupt(int irq, void *dev_id, struct pt_regs *r
iir = serial_in(up, UART_IIR);
if (!(iir & UART_IIR_NO_INT)) {
- spin_lock(&up->port.lock);
serial8250_handle_port(up, regs);
- spin_unlock(&up->port.lock);
handled = 1;
@@ -1426,11 +1430,8 @@ static void serial8250_timeout(unsigned long data)
unsigned int iir;
iir = serial_in(up, UART_IIR);
- if (!(iir & UART_IIR_NO_INT)) {
- spin_lock(&up->port.lock);
+ if (!(iir & UART_IIR_NO_INT))
serial8250_handle_port(up, NULL);
- spin_unlock(&up->port.lock);
- }
timeout = up->port.timeout;
timeout = timeout > 6 ? (timeout / 2 - 2) : 1;
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