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authorAlan Cox <alan@redhat.com>2008-10-13 10:39:46 +0100
committerLinus Torvalds <torvalds@linux-foundation.org>2008-10-13 09:51:41 -0700
commit4a90f09b20f4622dcbff1f0e1e6bae1704f8ad8c (patch)
tree9b275f88f2705cb10121d5982741aef3a088a7c8 /drivers/usb/serial/whiteheat.c
parent95f9bfc6b76e862265a2d70ae061eec18fe14140 (diff)
tty: usb-serial krefs
Use kref in the USB serial drivers so that we don't free tty structures from under the URB receive handlers as has historically been the case if you were unlucky. This also gives us a framework for general tty drivers to use tty_port objects and refcount. Contains two err->dev_err changes merged together to fix clashes in the -next tree. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/usb/serial/whiteheat.c')
-rw-r--r--drivers/usb/serial/whiteheat.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/usb/serial/whiteheat.c b/drivers/usb/serial/whiteheat.c
index 3a9d14384a4..11c8b97a517 100644
--- a/drivers/usb/serial/whiteheat.c
+++ b/drivers/usb/serial/whiteheat.c
@@ -1481,7 +1481,7 @@ static void rx_data_softint(struct work_struct *work)
struct whiteheat_private *info =
container_of(work, struct whiteheat_private, rx_work);
struct usb_serial_port *port = info->port;
- struct tty_struct *tty = port->port.tty;
+ struct tty_struct *tty = tty_port_tty_get(&port->port);
struct whiteheat_urb_wrap *wrap;
struct urb *urb;
unsigned long flags;
@@ -1493,7 +1493,7 @@ static void rx_data_softint(struct work_struct *work)
spin_lock_irqsave(&info->lock, flags);
if (info->flags & THROTTLED) {
spin_unlock_irqrestore(&info->lock, flags);
- return;
+ goto out;
}
list_for_each_safe(tmp, tmp2, &info->rx_urb_q) {
@@ -1513,7 +1513,7 @@ static void rx_data_softint(struct work_struct *work)
spin_unlock_irqrestore(&info->lock, flags);
tty_flip_buffer_push(tty);
schedule_work(&info->rx_work);
- return;
+ goto out;
}
tty_insert_flip_string(tty, urb->transfer_buffer, len);
sent += len;
@@ -1536,6 +1536,8 @@ static void rx_data_softint(struct work_struct *work)
if (sent)
tty_flip_buffer_push(tty);
+out:
+ tty_kref_put(tty);
}