linux-kernel - [PATCH 4.19 001/220] spi: mediatek: use correct mata->xfer

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Message-Id: <20191122100912.824212992@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:26:06 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Leilk Liu <leilk.liu@...iatek.com>,
        Mark Brown <broonie@...nel.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4.19 001/220] spi: mediatek: use correct mata->xfer_len when in fifo transfer

From: Leilk Liu <leilk.liu@...iatek.com>

commit a4d8f64f7267a88d4688f5c216926f5f6cafbae6 upstream.

when xfer_len is greater than 64 bytes and use fifo mode
to transfer, the actual length from the third time is mata->xfer_len
but not len in mtk_spi_interrupt().

Signed-off-by: Leilk Liu <leilk.liu@...iatek.com>
Signed-off-by: Mark Brown <broonie@...nel.org>
Cc: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/spi/spi-mt65xx.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -522,11 +522,11 @@ static irqreturn_t mtk_spi_interrupt(int
 		mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len);
 		mtk_spi_setup_packet(master);
 
-		cnt = len / 4;
+		cnt = mdata->xfer_len / 4;
 		iowrite32_rep(mdata->base + SPI_TX_DATA_REG,
 				trans->tx_buf + mdata->num_xfered, cnt);
 
-		remainder = len % 4;
+		remainder = mdata->xfer_len % 4;
 		if (remainder > 0) {
 			reg_val = 0;
 			memcpy(&reg_val,