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max3110: Fix up port->tty backreferencing 

We want to keep refcounts properly on this against hangup.

Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2011-08-26 11:26:00 +01:00 committed by Greg Kroah-Hartman
parent 51808f051e
commit da4e40e271
1 changed files with 5 additions and 2 deletions
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7
drivers/tty/serial/mrst_max3110.c
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@ -347,7 +347,7 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
if (!port->state)
return 0;
tty = port->state->port.tty;
tty = tty_port_tty_get(&port->state->port);
if (!tty)
return 0;
@ -364,8 +364,10 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
}
}
if (!w)
if (!w) {
tty_kref_put(tty);
return 0;
}
for (r = 0; w; r += usable, w -= usable) {
usable = tty_buffer_request_room(tty, w);
@ -375,6 +377,7 @@ receive_chars(struct uart_max3110 *max, unsigned short *str, int len)
}
}
tty_flip_buffer_push(tty);
tty_kref_put(tty);
return r;
}