Re: [PATCH 4.17.y] Revert "iommu/intel-iommu: Enable CONFIG_DMA_DIRECT_OPS=y and clean up intel_{alloc,free}_coherent()"

On Thu, Jul 26, 2018 at 03:02:05PM +0200, Jason A. Donenfeld wrote:

From: Christoph Hellwig hch@lst.de

commit 7ec916f82c48dcfc115eee2e3e0e6d400e310fc5 upstream.

This commit may cause a less than required dma mask to be used for some allocations, which apparently leads to module load failures for iwlwifi sometimes.

This reverts commit d657c5c73ca987214a6f9436e435b34fc60f332a.

Signed-off-by: Christoph Hellwig hch@lst.de Reported-by: Fabio Coatti fabio.coatti@gmail.com Tested-by: Fabio Coatti fabio.coatti@gmail.com

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Backporting this and submitting this to stable@, because without it, ordinary WiFi is broken on a fairly vanilla Thinkpad P50, on all 4.17 kernels.

Thanks, now queued up.

greg k-h