Messages in this thread | | | Date | Mon, 18 Apr 2011 10:29:38 +0200 | From | Nicolas Ferre <> | Subject | Re: [PATCH] drivers/spi/atmel_spi.c: prevent premature irqs |
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Le 11/04/2011 08:53, Voss, Nikolaus : > 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@weinmann.de>
Acked-by: Nicolas Ferre <nicolas.ferre@atmel.com>
> --- > 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)
-- Nicolas Ferre
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