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[PATCH] Serial: Adjust serial locking

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This patch changes the way serial ports are locked when getting modem
status.  This change is necessary because we will need to atomically
read the modem status and take action depending on the CTS status.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2005-06-29 09:42:38 +01:00
committed by Russell King
parent a839688362
commit c5f4644e6c
12 changed files with 29 additions and 41 deletions
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3
drivers/serial/sunsu.c
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@@ -572,13 +572,10 @@ static unsigned int sunsu_tx_empty(struct uart_port *port)
static unsigned int sunsu_get_mctrl(struct uart_port *port)
{
struct uart_sunsu_port *up = (struct uart_sunsu_port *) port;
unsigned long flags;
unsigned char status;
unsigned int ret;
spin_lock_irqsave(&up->port.lock, flags);
status = serial_in(up, UART_MSR);
spin_unlock_irqrestore(&up->port.lock, flags);
ret = 0;
if (status & UART_MSR_DCD)