[PATCH v2] usb: usbtmc: Fix disconnect/poll interaction

[Dave Penkler]

When the device is disconnected poll waiters were not being woken.

Changes for v2:
  - add commit summary
  - add Fixes and Reported-by tags   

Fixes: eb6b92ecc0f9 ("Add support for receiving USBTMC USB488 SRQ notifications 
via poll/select")
Reported-by: Oliver Neukum <oneu...@suse.com>
Signed-off-by: Dave Penkler <dpenk...@gmail.com>
---
 drivers/usb/class/usbtmc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/class/usbtmc.c b/drivers/usb/class/usbtmc.c
index 419c72e..917a55c 100644
--- a/drivers/usb/class/usbtmc.c
+++ b/drivers/usb/class/usbtmc.c
@@ -1525,13 +1525,14 @@ static void usbtmc_disconnect(struct usb_interface 
*intf)
        dev_dbg(&intf->dev, "usbtmc_disconnect called\n");
 
        data = usb_get_intfdata(intf);
-       usbtmc_free_int(data);
        usb_deregister_dev(intf, &usbtmc_class);
        sysfs_remove_group(&intf->dev.kobj, &capability_attr_grp);
        sysfs_remove_group(&intf->dev.kobj, &data_attr_grp);
        mutex_lock(&data->io_mutex);
        data->zombie = 1;
+       wake_up_all(&data->waitq);
        mutex_unlock(&data->io_mutex);
+       usbtmc_free_int(data);
        kref_put(&data->kref, usbtmc_delete);
 }
 
-- 
2.6.3