tty/serial: lay the foundations for the next set of reworks
- Stop drivers calling their own flush method indirectly, it obfuscates code
and it will change soon anyway
- A few more lock_kernel paths temporarily needed in some driver internal
waiting code
- Remove private put_char method that does a write call for one char - we
have that anyway
- Most but not yet all of the termios copy under lock fixing (some has other
dependencies to follow)
- Note a few locking bugs in drivers found in the process
- Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to
fix the termios locking
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/mcfserial.c b/drivers/serial/mcfserial.c
index ddd3aa5..aafa170 100644
--- a/drivers/serial/mcfserial.c
+++ b/drivers/serial/mcfserial.c
@@ -1072,18 +1072,6 @@
tty_wait_until_sent(tty, 0);
send_break(info, arg ? arg*(HZ/10) : HZ/4);
return 0;
- case TIOCGSOFTCAR:
- error = put_user(C_CLOCAL(tty) ? 1 : 0,
- (unsigned long *) arg);
- if (error)
- return error;
- return 0;
- case TIOCSSOFTCAR:
- get_user(arg, (unsigned long *) arg);
- tty->termios->c_cflag =
- ((tty->termios->c_cflag & ~CLOCAL) |
- (arg ? CLOCAL : 0));
- return 0;
case TIOCGSERIAL:
if (access_ok(VERIFY_WRITE, (void *) arg,
sizeof(struct serial_struct)))
@@ -1222,8 +1210,7 @@
} else
#endif
shutdown(info);
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
+ mcfrs_flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
@@ -1276,6 +1263,8 @@
* Note: we have to use pretty tight timings here to satisfy
* the NIST-PCTS.
*/
+ lock_kernel();
+
fifo_time = (MCF5272_FIFO_SIZE * HZ * 10) / info->baud;
char_time = fifo_time / 5;
if (char_time == 0)
@@ -1312,6 +1301,7 @@
if (timeout && time_after(jiffies, orig_jiffies + timeout))
break;
}
+ unlock_kernel();
#else
/*
* For the other coldfire models, assume all data has been sent