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TTY: ami_serial, remove BTM from wait_until_sent

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The same as in "TTY: serial, remove BTM from wait_until_sent" we don't
need to take BTM in wait_until_sent of ami_serial. Exactly the same
as serial, ami_serial accesses some "info" members (xmit_fifo_size,
timeout), but their assignment on other places in the code is not
protected by BTM anyway.

So the BTM protects nothing here. This removal helps us to get rid of
tty_locked() and __big_tty_mutex_owner in the following patch. This
was suggested by Arnd.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Andreas Bombe <aeb@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Jiri Slaby 2011-07-14 14:35:13 +02:00 committed by Greg Kroah-Hartman
parent 6a3e492b6d
commit eff4b0b9fe
1 changed files with 1 additions and 9 deletions
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10
drivers/tty/amiserial.c
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@ -1529,7 +1529,6 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
{
struct async_struct * info = tty->driver_data;
unsigned long orig_jiffies, char_time;
int tty_was_locked = tty_locked();
int lsr;
if (serial_paranoia_check(info, tty->name, "rs_wait_until_sent"))
@ -1540,12 +1539,6 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
orig_jiffies = jiffies;
/*
* tty_wait_until_sent is called from lots of places,
* with or without the BTM.
*/
if (!tty_was_locked)
tty_lock();
/*
* Set the check interval to be 1/5 of the estimated time to
* send a single character, and make it at least 1. The check
@ -1586,8 +1579,7 @@ static void rs_wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
__set_current_state(TASK_RUNNING);
if (!tty_was_locked)
tty_unlock();
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);
#endif