sean at mcneil.com
Sat Aug 23 19:28:54 CEST 2008
Andy Green wrote:
> Somebody in the thread at some point said:
> | Even better, but I still can get lockups. It might have something to do
> | with writing to
> | /sys/devices/platform/spi_s3c24xx_gpio.1/spi0.0/full_scale -> 9.2
> | /sys/devices/platform/spi_s3c24xx_gpio.1/spi0.1/full_scale -> 9.2
> | while the device is already open.
> Guh... yes they are protecting against themselves but not against the
> interrupt traffic which is bitbanged in the ISR. Linux SPI won't work
> with interrupts off either IIRC. So it needs bitbang all the way, baby.
Plus it looks like both are hanging off the same spi? The comment in
close is incorrect then as access is only serialized for a particular
input, not both. So, open(1), open(2), close(2) will cause (1) to stop
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