s390/qeth: restart pending READ cmd from callback

The completion of a pending READ cmd is processed via
qeth_issue_next_read_cb(). Let this callback also start the next READ
cmd, instead of hardcoding that step into the IRQ handler.

While at it remove the check of the channel state,
__qeth_issue_next_read() already does this.
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/s390/net/qeth_core_main.c

@@ -851,6 +851,7 @@ static void qeth_issue_next_read_cb(struct qeth_card *card,
 		QETH_PDU_HEADER_SEQ_NO(iob->data),
 		QETH_SEQ_NO_LENGTH);
 	qeth_release_buffer(channel, iob);
+	__qeth_issue_next_read(card);
 }
 
 static int qeth_set_thread_start_bit(struct qeth_card *card,
@@ -1115,9 +1116,6 @@ static void qeth_irq(struct ccw_device *cdev, unsigned long intparm,
 	}
 	if (channel == &card->data)
 		return;
-	if (channel == &card->read &&
-	    channel->state == CH_STATE_UP)
-		__qeth_issue_next_read(card);
 
 	if (iob && iob->callback)
 		iob->callback(card, iob->channel, iob);