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

On 2023-08-25 17:10, 'Anders Blomdell' via Comedi: Linux Control and Measurement Device Interface wrote:
> 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.
And the driver built with the kernel source works (6.4.11).
> 
> 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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