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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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4
drivers/serial/pmac_zilog.c
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@@ -604,7 +604,7 @@ static void pmz_set_mctrl(struct uart_port *port, unsigned int mctrl)
/*
* Get Modem Control bits (only the input ones, the core will
* or that with a cached value of the control ones)
* The port lock is not held.
* The port lock is held and interrupts are disabled.
*/
static unsigned int pmz_get_mctrl(struct uart_port *port)
{
@@ -615,7 +615,7 @@ static unsigned int pmz_get_mctrl(struct uart_port *port)
if (ZS_IS_ASLEEP(uap) || uap->node == NULL)
return 0;
status = pmz_peek_status(to_pmz(port));
status = read_zsreg(uap, R0);
ret = 0;
if (status & DCD)