Hi,
poll() should test for a disconnection of the device.
Regards
Oliver
Signed-off-by: Oliver Neukum <oliver@xxxxxxxxxx>
--
commit 1de37cb76ada5abc59f4b0a1037b251188579803
Author: Oliver Neukum <oneukum@linux-d698.(none)>
Date: Thu Jul 2 16:52:22 2009 +0200
usb: ldusb: return an error in poll if device is unplugged
diff --git a/drivers/usb/misc/ldusb.c b/drivers/usb/misc/ldusb.c
index ad4fb15..90f1301 100644
--- a/drivers/usb/misc/ldusb.c
+++ b/drivers/usb/misc/ldusb.c
@@ -412,6 +412,9 @@ static unsigned int ld_usb_poll(struct file *file, poll_table *wait)
dev = file->private_data;
+ if (!dev->intf)
+ return POLLERR | POLLHUP;
+
poll_wait(file, &dev->read_wait, wait);
poll_wait(file, &dev->write_wait, wait);
@@ -767,6 +770,9 @@ static void ld_usb_disconnect(struct usb_interface *intf)
ld_usb_delete(dev);
} else {
dev->intf = NULL;
+ /* wake up pollers */
+ wake_up_interruptible_all(&dev->read_wait);
+ wake_up_interruptible_all(&dev->write_wait);
mutex_unlock(&dev->mutex);
}
--
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