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authorPeter Hurley <peter@hurleysoftware.com>2016-04-09 17:53:25 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-04-30 09:26:55 -0700
commitd41861ca19c9e96f12a4f1ebbc8255d00909a232 (patch)
tree4b09c15500d404b0b375469dd673f0bc8fd05f5f /drivers/tty/synclinkmp.c
parent80f02d5424301bf4df195d09b1a664f394435851 (diff)
downloadlinux-d41861ca19c9e96f12a4f1ebbc8255d00909a232.tar.bz2
tty: Replace ASYNC_INITIALIZED bit and update atomically
Replace ASYNC_INITIALIZED bit in the tty_port::flags field with TTY_PORT_INITIALIZED bit in the tty_port::iflags field. Introduce helpers tty_port_set_initialized() and tty_port_initialized() to abstract atomic bit ops. Note: the transforms for test_and_set_bit() and test_and_clear_bit() are unnecessary as the state transitions are already mutually exclusive; the tty lock prevents concurrent open/close/hangup. Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/synclinkmp.c')
-rw-r--r--drivers/tty/synclinkmp.c16
1 files changed, 8 insertions, 8 deletions
diff --git a/drivers/tty/synclinkmp.c b/drivers/tty/synclinkmp.c
index 17bab5f5b858..6dcfc2089373 100644
--- a/drivers/tty/synclinkmp.c
+++ b/drivers/tty/synclinkmp.c
@@ -812,7 +812,7 @@ static void close(struct tty_struct *tty, struct file *filp)
goto cleanup;
mutex_lock(&info->port.mutex);
- if (info->port.flags & ASYNC_INITIALIZED)
+ if (tty_port_initialized(&info->port))
wait_until_sent(tty, info->timeout);
flush_buffer(tty);
@@ -1061,7 +1061,7 @@ static void wait_until_sent(struct tty_struct *tty, int timeout)
if (sanity_check(info, tty->name, "wait_until_sent"))
return;
- if (!test_bit(ASYNCB_INITIALIZED, &info->port.flags))
+ if (!tty_port_initialized(&info->port))
goto exit;
orig_jiffies = jiffies;
@@ -2636,7 +2636,7 @@ static int startup(SLMP_INFO * info)
if ( debug_level >= DEBUG_LEVEL_INFO )
printk("%s(%d):%s tx_releaseup()\n",__FILE__,__LINE__,info->device_name);
- if (info->port.flags & ASYNC_INITIALIZED)
+ if (tty_port_initialized(&info->port))
return 0;
if (!info->tx_buf) {
@@ -2662,7 +2662,7 @@ static int startup(SLMP_INFO * info)
if (info->port.tty)
clear_bit(TTY_IO_ERROR, &info->port.tty->flags);
- info->port.flags |= ASYNC_INITIALIZED;
+ tty_port_set_initialized(&info->port, 1);
return 0;
}
@@ -2673,7 +2673,7 @@ static void shutdown(SLMP_INFO * info)
{
unsigned long flags;
- if (!(info->port.flags & ASYNC_INITIALIZED))
+ if (!tty_port_initialized(&info->port))
return;
if (debug_level >= DEBUG_LEVEL_INFO)
@@ -2705,7 +2705,7 @@ static void shutdown(SLMP_INFO * info)
if (info->port.tty)
set_bit(TTY_IO_ERROR, &info->port.tty->flags);
- info->port.flags &= ~ASYNC_INITIALIZED;
+ tty_port_set_initialized(&info->port, 0);
}
static void program_hw(SLMP_INFO *info)
@@ -3308,12 +3308,12 @@ static int block_til_ready(struct tty_struct *tty, struct file *filp,
port->blocked_open++;
while (1) {
- if (C_BAUD(tty) && test_bit(ASYNCB_INITIALIZED, &port->flags))
+ if (C_BAUD(tty) && tty_port_initialized(port))
tty_port_raise_dtr_rts(port);
set_current_state(TASK_INTERRUPTIBLE);
- if (tty_hung_up_p(filp) || !(port->flags & ASYNC_INITIALIZED)){
+ if (tty_hung_up_p(filp) || !tty_port_initialized(port)) {
retval = (port->flags & ASYNC_HUP_NOTIFY) ?
-EAGAIN : -ERESTARTSYS;
break;