apfs/linux-apfs
0
0
Fork 0
mirror of https://github.com/linux-apfs/linux-apfs.git synced 2026-05-01 15:00:59 -07:00
Code Issues Packages Projects Releases Wiki Activity

[PATCH] Serial: Adjust serial locking

Browse Source 
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
Download Patch File Download Diff File Expand all files Collapse all files
drivers/serial/sunsab.c
+1 -6
View File
@@ -426,18 +426,15 @@ static void sunsab_set_mctrl(struct uart_port *port, unsigned int mctrl)
sunsab_tx_idle(up);
}
/* port->lock is not held. */
/* port->lock is held by caller and interrupts are disabled. */
static unsigned int sunsab_get_mctrl(struct uart_port *port)
{
struct uart_sunsab_port *up = (struct uart_sunsab_port *) port;
unsigned long flags;
unsigned char val;
unsigned int result;
result = 0;
spin_lock_irqsave(&up->port.lock, flags);
val = readb(&up->regs->r.pvr);
result |= (val & up->pvr_dsr_bit) ? 0 : TIOCM_DSR;
@@ -447,8 +444,6 @@ static unsigned int sunsab_get_mctrl(struct uart_port *port)
val = readb(&up->regs->r.star);
result |= (val & SAB82532_STAR_CTS) ? TIOCM_CTS : 0;
spin_unlock_irqrestore(&up->port.lock, flags);
return result;
}