diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2012-03-05 17:52:21 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-03-09 00:30:50 +0400 |
| commit | 0f9b9684db2d1369fe303de5729cbdc817265bec (patch) | |
| tree | 6a26ef3d46a010d131d6df4948fa455ec4981a68 | |
| parent | 916b765675b7044bd5895b7430a2aa2c63ea4545 (diff) | |
| download | linux-0f9b9684db2d1369fe303de5729cbdc817265bec.tar.xz | |
TTY: amiserial, simplify set_serial_info
Do not copy whole serial_state. We only need to know whether the speed
is to be changed. Hence store the info in advance and use it later.
A simple bool is enough.
Also remove reduntant assignments and move the tests directly to the
'if'.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/amiserial.c | 20 |
1 files changed, 8 insertions, 12 deletions
diff --git a/drivers/tty/amiserial.c b/drivers/tty/amiserial.c index 410e8e7e6bfe..165cd79faea2 100644 --- a/drivers/tty/amiserial.c +++ b/drivers/tty/amiserial.c @@ -1042,21 +1042,19 @@ static int set_serial_info(struct serial_state *state, struct serial_struct __user * new_info) { struct serial_struct new_serial; - struct serial_state old_state; - unsigned int change_irq,change_port; + bool change_spd; int retval = 0; if (copy_from_user(&new_serial,new_info,sizeof(new_serial))) return -EFAULT; tty_lock(); - old_state = *state; - - change_irq = new_serial.irq != state->irq; - change_port = (new_serial.port != state->port); - if(change_irq || change_port || (new_serial.xmit_fifo_size != state->xmit_fifo_size)) { - tty_unlock(); - return -EINVAL; + change_spd = ((new_serial.flags ^ state->flags) & ASYNC_SPD_MASK) || + new_serial.custom_divisor != state->custom_divisor; + if (new_serial.irq != state->irq || new_serial.port != state->port || + new_serial.xmit_fifo_size != state->xmit_fifo_size) { + tty_unlock(); + return -EINVAL; } if (!serial_isroot()) { @@ -1092,9 +1090,7 @@ static int set_serial_info(struct serial_state *state, check_and_exit: if (state->flags & ASYNC_INITIALIZED) { - if (((old_state.flags & ASYNC_SPD_MASK) != - (state->flags & ASYNC_SPD_MASK)) || - (old_state.custom_divisor != state->custom_divisor)) { + if (change_spd) { if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_HI) state->tty->alt_speed = 57600; if ((state->flags & ASYNC_SPD_MASK) == ASYNC_SPD_VHI) |