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USB: serial: fix USB serial fix kfifo_len locking 

This patch fix a possible race bug in drivers/usb/serial/generic with
the new kfifo API.

Please apply it to the 2.6.33-rc* tree.

Signed-off-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Stefani Seibold 2010-01-05 14:30:31 +01:00 committed by Greg Kroah-Hartman
parent 24bc7347da
commit 25719e6b46
1 changed files with 4 additions and 4 deletions
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8
drivers/usb/serial/generic.c
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@ -386,12 +386,12 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty)
dbg("%s - port %d", __func__, port->number); dbg("%s - port %d", __func__, port->number);
if (serial->type->max_in_flight_urbs) { spin_lock_irqsave(&port->lock, flags);
spin_lock_irqsave(&port->lock, flags); if (serial->type->max_in_flight_urbs)
chars = port->tx_bytes_flight; chars = port->tx_bytes_flight;
spin_unlock_irqrestore(&port->lock, flags); else if (serial->num_bulk_out)
} else if (serial->num_bulk_out)
chars = kfifo_len(&port->write_fifo); chars = kfifo_len(&port->write_fifo);
spin_unlock_irqrestore(&port->lock, flags);
dbg("%s - returns %d", __func__, chars); dbg("%s - returns %d", __func__, chars);
return chars; return chars;