From d35b4ce164f393ad58580ad3e9fdde86328739ad Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Thu, 2 Jul 2009 12:07:07 +0200 Subject: [PATCH] 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 Signed-off-by: Greg Kroah-Hartman --- drivers/usb/misc/legousbtower.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/usb/misc/legousbtower.c b/drivers/usb/misc/legousbtower.c index 97efeaec4d52..faa6d623de78 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); } -- GitLab