cdc-wdm: Don't clear WDM_READ unless entire read buffer is emptied

The WDM_READ flag is cleared later iff desc->length is reduced to 0.

Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Tested-by: Bjørn Mork <bjorn@mork.no>
Cc: Oliver Neukum <oliver@neukum.org>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index 7ca54d4..6037b50 100644 (file)
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -455,7 +455,6 @@ retry:
                        spin_unlock_irq(&desc->iuspin);
                        goto retry;
                }
-               clear_bit(WDM_READ, &desc->flags);
                cntr = desc->length;
                spin_unlock_irq(&desc->iuspin);
        }