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authorAlan Cox <alan@lxorguk.ukuu.org.uk>2008-04-30 00:53:59 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-30 08:29:45 -0700
commit978e595f88a1fba5869aa42a4af4fba36f33ecac (patch)
tree60848f49949c5b7b518621ee36cdc6d500244539 /drivers/char/mxser.c
parentac0e4b7d319bf284bb64bc7e1c051417386b34a4 (diff)
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>
Diffstat (limited to 'drivers/char/mxser.c')
-rw-r--r--drivers/char/mxser.c47
1 files changed, 24 insertions, 23 deletions
diff --git a/drivers/char/mxser.c b/drivers/char/mxser.c
index 00cf09aa11fc..28f63566ab8a 100644
--- a/drivers/char/mxser.c
+++ b/drivers/char/mxser.c
@@ -927,6 +927,27 @@ static int mxser_open(struct tty_struct *tty, struct file *filp)
return 0;
}
+static void mxser_flush_buffer(struct tty_struct *tty)
+{
+ struct mxser_port *info = tty->driver_data;
+ char fcr;
+ unsigned long flags;
+
+
+ spin_lock_irqsave(&info->slock, flags);
+ info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
+
+ fcr = inb(info->ioaddr + UART_FCR);
+ outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
+ info->ioaddr + UART_FCR);
+ outb(fcr, info->ioaddr + UART_FCR);
+
+ spin_unlock_irqrestore(&info->slock, flags);
+
+ tty_wakeup(tty);
+}
+
+
/*
* This routine is called when the serial port gets closed. First, we
* wait for the last remaining data to be sent. Then, we unlink its
@@ -1013,9 +1034,7 @@ static void mxser_close(struct tty_struct *tty, struct file *filp)
}
mxser_shutdown(info);
- if (tty->driver->flush_buffer)
- tty->driver->flush_buffer(tty);
-
+ mxser_flush_buffer(tty);
tty_ldisc_flush(tty);
tty->closing = 0;
@@ -1142,26 +1161,6 @@ static int mxser_chars_in_buffer(struct tty_struct *tty)
return info->xmit_cnt;
}
-static void mxser_flush_buffer(struct tty_struct *tty)
-{
- struct mxser_port *info = tty->driver_data;
- char fcr;
- unsigned long flags;
-
-
- spin_lock_irqsave(&info->slock, flags);
- info->xmit_cnt = info->xmit_head = info->xmit_tail = 0;
-
- fcr = inb(info->ioaddr + UART_FCR);
- outb((fcr | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT),
- info->ioaddr + UART_FCR);
- outb(fcr, info->ioaddr + UART_FCR);
-
- spin_unlock_irqrestore(&info->slock, flags);
-
- tty_wakeup(tty);
-}
-
/*
* ------------------------------------------------------------
* friends of mxser_ioctl()
@@ -1992,6 +1991,7 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
timeout, char_time);
printk("jiff=%lu...", jiffies);
#endif
+ lock_kernel();
while (!((lsr = inb(info->ioaddr + UART_LSR)) & UART_LSR_TEMT)) {
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...", lsr, jiffies);
@@ -2003,6 +2003,7 @@ static void mxser_wait_until_sent(struct tty_struct *tty, int timeout)
break;
}
set_current_state(TASK_RUNNING);
+ unlock_kernel();
#ifdef SERIAL_DEBUG_RS_WAIT_UNTIL_SENT
printk("lsr = %d (jiff=%lu)...done\n", lsr, jiffies);