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Date: Wed, 20 Feb 2008 20:18:57 +0000
From: Alan Cox <alan@...rguk.ukuu.org.uk>
To: akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] moxa: prepare for BKL pushdown
Moxa needs a few routines wrapping with the BKL for now. It also snoops
the TIOCG/SSOFTCAR function so needs its own implementation for now. That
wants fixing by turning it into a termios set downcall into the drivers
later.
Signed-off-by: Alan Cox <alan@...hat.com>
diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-rc2-mm1/drivers/char/moxa.c linux-2.6.25-rc2-mm1/drivers/char/moxa.c
--- linux.vanilla-2.6.25-rc2-mm1/drivers/char/moxa.c 2008-02-19 11:03:00.000000000 +0000
+++ linux-2.6.25-rc2-mm1/drivers/char/moxa.c 2008-02-20 11:45:50.000000000 +0000
@@ -686,8 +686,8 @@
int flag = 0, dtr, rts;
port = tty->index;
- if ((port != MAX_PORTS) && (!ch))
- return (-EINVAL);
+ if (port != MAX_PORTS && !ch)
+ return -EINVAL;
MoxaPortGetLineOut(ch->port, &dtr, &rts);
if (dtr)
@@ -712,9 +712,10 @@
int dtr, rts;
port = tty->index;
- if ((port != MAX_PORTS) && (!ch))
- return (-EINVAL);
+ if (port != MAX_PORTS && !ch)
+ return -EINVAL;
+ lock_kernel();
MoxaPortGetLineOut(ch->port, &dtr, &rts);
if (set & TIOCM_RTS)
rts = 1;
@@ -725,6 +726,7 @@
if (clear & TIOCM_DTR)
dtr = 0;
MoxaPortLineCtrl(ch->port, dtr, rts);
+ unlock_kernel();
return 0;
}
@@ -734,52 +736,56 @@
struct moxa_port *ch = (struct moxa_port *) tty->driver_data;
register int port;
void __user *argp = (void __user *)arg;
- int retval;
-
+ int retval = 0;
+
port = tty->index;
- if ((port != MAX_PORTS) && (!ch))
- return (-EINVAL);
+ if (port != MAX_PORTS && !ch)
+ return -EINVAL;
switch (cmd) {
case TCSBRK: /* SVID version: non-zero arg --> no break */
retval = tty_check_change(tty);
if (retval)
- return (retval);
+ break;
moxa_setup_empty_event(tty);
tty_wait_until_sent(tty, 0);
if (!arg)
MoxaPortSendBreak(ch->port, 0);
- return (0);
+ break;
case TCSBRKP: /* support for POSIX tcsendbreak() */
retval = tty_check_change(tty);
if (retval)
- return (retval);
+ break;
moxa_setup_empty_event(tty);
tty_wait_until_sent(tty, 0);
MoxaPortSendBreak(ch->port, arg);
- return (0);
- case TIOCGSOFTCAR:
- return put_user(C_CLOCAL(tty) ? 1 : 0, (unsigned long __user *) argp);
+ break;
case TIOCSSOFTCAR:
if(get_user(retval, (unsigned long __user *) argp))
return -EFAULT;
arg = retval;
+ mutex_lock(&tty->termios_mutex);
tty->termios->c_cflag = ((tty->termios->c_cflag & ~CLOCAL) |
(arg ? CLOCAL : 0));
if (C_CLOCAL(tty))
ch->asyncflags &= ~ASYNC_CHECK_CD;
else
ch->asyncflags |= ASYNC_CHECK_CD;
- return (0);
+ mutex_unlock(&tty->termios_mutex);
+ break;
case TIOCGSERIAL:
return moxa_get_serial_info(ch, argp);
-
case TIOCSSERIAL:
- return moxa_set_serial_info(ch, argp);
+ lock_kernel();
+ retval = moxa_set_serial_info(ch, argp);
+ unlock_kernel();
+ break;
default:
+ lock_kernel();
retval = MoxaDriverIoctl(cmd, arg, port);
+ unlock_kernel();
}
- return (retval);
+ return retval;
}
static void moxa_throttle(struct tty_struct *tty)
@@ -2414,6 +2420,7 @@
struct serial_struct tmp;
memset(&tmp, 0, sizeof(tmp));
+ lock_kernel();
tmp.type = info->type;
tmp.line = info->port;
tmp.port = 0;
@@ -2424,6 +2431,7 @@
tmp.closing_wait = info->closing_wait;
tmp.custom_divisor = 0;
tmp.hub6 = 0;
+ unlock_kernel();
if(copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
return -EFAULT;
return (0);
--
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