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authorOliver Neukum <oliver@neukum.org>2009-07-02 12:07:07 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2009-09-23 06:46:28 -0700
commitd35b4ce164f393ad58580ad3e9fdde86328739ad (patch)
tree847f4cd7511d74e95dc9f0df96610b518eaf4212 /drivers/usb/misc
parenta4708103adeaf5731c329b37b0a2b397f814c55c (diff)
USB: legousbtower: make poll notice disconnect
poll needs to return an error if a device is disconnected - make poll check for device's presence - wake all waiters in disconnect Signed-off-by: Oliver Neukum <oliver@neukum.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/misc')
-rw-r--r--drivers/usb/misc/legousbtower.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c
index 97efeaec4d5..faa6d623de7 100644
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -552,6 +552,9 @@ static unsigned int tower_poll (struct file *file, poll_table *wait)
dev = file->private_data;
+ if (!dev->udev)
+ return POLLERR | POLLHUP;
+
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
@@ -1025,6 +1028,9 @@ static void tower_disconnect (struct usb_interface *interface)
tower_delete (dev);
} else {
dev->udev = NULL;
+ /* wake up pollers */
+ wake_up_interruptible_all(&dev->read_wait);
+ wake_up_interruptible_all(&dev->write_wait);
mutex_unlock(&dev->lock);
}