linux-kernel - [PATCH] drivers/spi/atmel_spi.c: prevent premature irqs

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Date:	Mon, 11 Apr 2011 08:53:59 +0200
From:	"Voss, Nikolaus" <N.Voss@...nmann.de>
To:	"'Linux Kernel'" <linux-kernel@...r.kernel.org>
CC:	"'Nicolas Ferre'" <nicolas.ferre@...el.com>
Subject: [PATCH] drivers/spi/atmel_spi.c: prevent premature irqs

When restarting a kernel using kexec, filled rx buffers on SPI master
interface reliably crash the kernel. This patch disables rx interrupts
on startup to avoid this. Interrupts will be regulary enabled at start
of a new SPI master transfer.

Signed-off-by: Nikolaus Voss <n.voss@...nmann.de>
---
 drivers/spi/atmel_spi.c |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/drivers/spi/atmel_spi.c b/drivers/spi/atmel_spi.c
index 1a478bf..d17f14c 100644
--- a/drivers/spi/atmel_spi.c
+++ b/drivers/spi/atmel_spi.c
@@ -811,6 +811,9 @@ static int __init atmel_spi_probe(struct platform_device *pdev)
 	as->irq = irq;
 	as->clk = clk;
 
+	/* disable rx interrupts to avoid premature irq triggering */
+	spi_writel(as, IDR, SPI_BIT(RXBUFF) | SPI_BIT(ENDRX) | SPI_BIT(OVRES));
+
 	ret = request_irq(irq, atmel_spi_interrupt, 0,
 			dev_name(&pdev->dev), master);
 	if (ret)
-- 
1.5.4.3

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