linux-kernel - [PATCH v2] spi: altera: Add empty implementation of setup

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Date:	Thu,  9 Apr 2015 17:54:13 +0200
From:	Pelle Nilsson <per.nilsson@...mo.com>
To:	broonie@...nel.org
Cc:	linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
	nios2-dev@...ts.rocketboards.org
Subject: [PATCH v2] spi: altera: Add empty implementation of setup_transfer callback

spi-altera driver is broken and causes a kernel panic due to a NULL
pointer dereference during first SPI transaction. The setup_transfer()
bitbang callback is mandatory when the txrx_bufs() callback is
present. It was therefore an error to remove it in commit
30af9b558a56. This patch simply adds back an empty implementation of
the callback.

Signed-off-by: Pelle Nilsson <per.nilsson@...mo.com>
---
 drivers/spi/spi-altera.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/spi/spi-altera.c b/drivers/spi/spi-altera.c
index b95010e..6d72b1d 100644
--- a/drivers/spi/spi-altera.c
+++ b/drivers/spi/spi-altera.c
@@ -197,6 +197,11 @@ static irqreturn_t altera_spi_irq(int irq, void *dev)
 	return IRQ_HANDLED;
 }
 
+static int altera_spi_setupxfer(struct spi_device *spi, struct spi_transfer *t)
+{
+	return 0;
+}
+
 static int altera_spi_probe(struct platform_device *pdev)
 {
 	struct altera_spi *hw;
@@ -220,6 +225,7 @@ static int altera_spi_probe(struct platform_device *pdev)
 
 	/* setup the state for the bitbang driver */
 	hw->bitbang.master = master;
+	hw->bitbang.setup_transfer = altera_spi_setupxfer;
 	hw->bitbang.chipselect = altera_spi_chipsel;
 	hw->bitbang.txrx_bufs = altera_spi_txrx;
 
-- 
1.9.1

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