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[PATCH] serial core: work around sub-driver bugs 

We're presently getting oopses because Bluetooth (and possibly other) drivers
are calling core functions after things have been shut down.

So rather than oopsing, let's drop a warning then take avoiding action, so the
machine survives.  Once all the sub-drivers are fixed up we can remove the
take-avoiding-action part.

Signed-off-by: Pavel Machek <pavel@suse.cz>
Cc: Russell King <rmk@arm.linux.org.uk>
Cc: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pavel Machek 2006-03-07 21:55:20 -08:00 committed by Linus Torvalds
parent 1c6cc5fd32
commit d5f735e52f
1 changed files with 29 additions and 3 deletions
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32
drivers/serial/serial_core.c
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@ -71,6 +71,11 @@ static void uart_change_pm(struct uart_state *state, int pm_state);
void uart_write_wakeup(struct uart_port *port)
{
struct uart_info *info = port->info;
/*
* This means you called this function _after_ the port was
* closed. No cookie for you.
*/
BUG_ON(!info);
tasklet_schedule(&info->tlet);
}
@ -471,14 +476,26 @@ static void uart_flush_chars(struct tty_struct *tty)
}
static int
uart_write(struct tty_struct *tty, const unsigned char * buf, int count)
uart_write(struct tty_struct *tty, const unsigned char *buf, int count)
{
struct uart_state *state = tty->driver_data;
struct uart_port *port = state->port;
struct circ_buf *circ = &state->info->xmit;
struct uart_port *port;
struct circ_buf *circ;
unsigned long flags;
int c, ret = 0;
/*
* This means you called this function _after_ the port was
* closed. No cookie for you.
*/
if (!state || !state->info) {
WARN_ON(1);
return -EL3HLT;
}
port = state->port;
circ = &state->info->xmit;
if (!circ->buf)
return 0;
@ -521,6 +538,15 @@ static void uart_flush_buffer(struct tty_struct *tty)
struct uart_port *port = state->port;
unsigned long flags;
/*
* This means you called this function _after_ the port was
* closed. No cookie for you.
*/
if (!state || !state->info) {
WARN_ON(1);
return;
}
DPRINTK("uart_flush_buffer(%d) called\n", tty->index);
spin_lock_irqsave(&port->lock, flags);