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The azx_bus->dma_type is referred only for allocating the communication buffers like CORB/RIRB, and the allocation size is small. Hence it doesn't have to be S/G buffer allocation, which is an obvious overkill. Use the standard SNDRV_DMA_TYPE_DEV_WC instead. This was changed to SNDRV_DMA_TYPE_DEV_WC_SG in the commit37137ec26c("ALSA: hda: Once again fix regression of page allocations with IOMMU") as a workaround for IOMMU-backed allocations. But this is no longer needed since the allocation with SNDRV_DMA_TYPE_DEV_WC itself was fixed in the commit9c27301342("ALSA: memalloc: Use DMA API for x86 WC page allocations, too"). So this patch reverts the previous workaround in this piece of code. Link: https://patch.msgid.link/20240909134744.25426-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.