[comedi] On later kernels 'comedi_config /dev/comedi0 ni_pcimio' does not work

With comedi from https://github.com/Linux-Comedi/comedi (git tag 9792ce4) 'comedi_config /dev/comedi0 ni_pcimio'
later kernels (6.2.9, 6.3.7 and 6.4.6) fails with 'Buffer allocation failed' in dmesg but earlier kernels (6.0.15) works.

The problem is that the call to 'dma_alloc_coherent' (called from 'comedi_buf_alloc' fails to allocate
the needed buffer.

Looking at the source in the kernel tree shows very different code in 'comedi_buf_alloc', than in the standalone comedi.

Should I take this as a discouragement to use the out of tree version of comedi, and instead rebuild the kernel with
comedi support?

Best regards

/Anders
-- 
Anders Blomdell                  Email: [email protected]
Department of Automatic Control
Lund University                  Phone:    +46 46 222 8793
P.O. Box 118
SE-221 00 Lund, Sweden

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