On Thu, 2021-01-28 at 14:26 +0000, Phil Elwell wrote: > Hi, > > Commit [1] - an optimisation of the PIO transfers loops of spi-bcm2835 > - causes lockups if a zero-length transfer is attempted. The commit > message says that "[t]he blind and counted loops are always called > with nonzero count", which is technically true but ignores the fact > that count can be reduced to zero before entering the loop if tfr->len > is zero. > > A workaround has been added in the raspberrypi/linux repo that > explicitly checks for zero-length transfers in > bcm2835_spi_transfer_one, but perhaps it would be better to catch this > degenerate case in the common framework code - I'm not an SPI expert. Me neither to be honest, but I'll have a look at it. Thanks for the heads-up. Regards, Nicolas
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