ipack/devices/ipoctal: Fix race condition during Tx

In order to transmit data, the driver enables Tx and sleeps until
*board_write is set to 1 by the interrupt handler.

It can happen, though, that the data is sent even before the process
is asleep. In this case *board_write must be set to 1 anyway,
otherwise we will be waiting for a condition that will never be true.

Signed-off-by: Alberto Garcia <agarcia@igalia.com>
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/ipack/devices/ipoctal.c

@@ -195,13 +195,10 @@ static void ipoctal_irq_tx(struct ipoctal_channel *channel)
 	*pointer_write = *pointer_write % PAGE_SIZE;
 	channel->nb_bytes--;
 
-	if ((channel->nb_bytes == 0) &&
-	    (waitqueue_active(&channel->queue))) {
-
-		if (channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
-			*channel->board_write = 1;
-			wake_up_interruptible(&channel->queue);
-		}
+	if (channel->nb_bytes == 0 &&
+	    channel->board_id != IPACK1_DEVICE_ID_SBS_OCTAL_485) {
+		*channel->board_write = 1;
+		wake_up_interruptible(&channel->queue);
 	}
 }