USB: fix oops on disconnect in cdc-acm
This patch fixes an oops caused when during an unplug a device's table
of endpoints is zeroed before the driver is notified. A pointer to
the endpoint must be cached.
this fixes a regression caused by commit
5186ffee2320942c3dc9745f7930e0eb15329ca6
Therefore it should go into 2.6.31
Signed-off-by: Oliver Neukum <oliver@neukum.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e1f8941..2bfc41e 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -387,7 +387,6 @@
struct acm_ru *rcv;
unsigned long flags;
unsigned char throttled;
- struct usb_host_endpoint *ep;
dbg("Entering acm_rx_tasklet");
@@ -463,14 +462,12 @@
rcv->buffer = buf;
- ep = (usb_pipein(acm->rx_endpoint) ? acm->dev->ep_in : acm->dev->ep_out)
- [usb_pipeendpoint(acm->rx_endpoint)];
- if (usb_endpoint_xfer_int(&ep->desc))
+ if (acm->is_int_ep)
usb_fill_int_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
buf->base,
acm->readsize,
- acm_read_bulk, rcv, ep->desc.bInterval);
+ acm_read_bulk, rcv, acm->bInterval);
else
usb_fill_bulk_urb(rcv->urb, acm->dev,
acm->rx_endpoint,
@@ -1183,6 +1180,9 @@
spin_lock_init(&acm->read_lock);
mutex_init(&acm->mutex);
acm->rx_endpoint = usb_rcvbulkpipe(usb_dev, epread->bEndpointAddress);
+ acm->is_int_ep = usb_endpoint_xfer_int(epread);
+ if (acm->is_int_ep)
+ acm->bInterval = epread->bInterval;
tty_port_init(&acm->port);
acm->port.ops = &acm_port_ops;