openwrtv4/target/linux/ipq806x/patches-4.4/711-spi-qup-Fix-transaction-done-signaling.patch

From 8e830bd17e945e74964a5b61353d74e34c0791cd Mon Sep 17 00:00:00 2001
From: Andy Gross <andy.gross@linaro.org>
Date: Fri, 29 Jan 2016 22:06:50 -0600
Subject: [PATCH] spi: qup: Fix transaction done signaling

Wait to signal done until we get all of the interrupts we are expecting
to get for a transaction.  If we don't wait for the input done flag, we
can be inbetween transactions when the done flag comes in and this can
mess up the next transaction.

Change-Id: I08d78376e71590663158d6434a3fb7c0623264c9
CC: Grant Grundler <grundler@chromium.org>
CC: Sarthak Kukreti <skukreti@codeaurora.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
---
 drivers/spi/spi-qup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -447,7 +447,8 @@ static irqreturn_t spi_qup_qup_irq(int i
 	controller->xfer = xfer;
 	spin_unlock_irqrestore(&controller->lock, flags);
 
-	if (controller->rx_bytes == xfer->len || error)
+	if ((controller->rx_bytes == xfer->len &&
+		(opflags & QUP_OP_MAX_INPUT_DONE_FLAG)) ||  error)
 		complete(&controller->done);
 
 	return IRQ_HANDLED;