This is a note to let you know that I've just added the patch titled
Subject: USB: legousbtower: make poll notice disconnect
to my gregkh-2.6 tree. Its filename is
usb-legousbtower-make-poll-notice-disconnect.patch
This tree can be found at
http://www.kernel.org/pub/linux/kernel/people/gregkh/gregkh-2.6/patches/
>From oliver@xxxxxxxxxx Fri Jul 10 15:17:50 2009
From: Oliver Neukum <oliver@xxxxxxxxxx>
Date: Thu, 2 Jul 2009 12:07:07 +0200
Subject: USB: legousbtower: make poll notice disconnect
To: greg@xxxxxxxxx, USB list <linux-usb@xxxxxxxxxxxxxxx>, starblue@xxxxxxxxxxxxxxxxxxxxx, davidgsf@xxxxxxxxxxxxxxx
Message-ID: <200907021207.07770.oliver@xxxxxxxxxx>
Content-Disposition: inline
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@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
drivers/usb/misc/legousbtower.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/usb/misc/legousbtower.c
+++ b/drivers/usb/misc/legousbtower.c
@@ -552,6 +552,9 @@ static unsigned int tower_poll (struct f
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
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);
}
--
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