netdev - regression in ath10k dma allocation

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Date:   Fri, 16 Aug 2019 18:08:26 +0200
From:   Tobias Klausmann <tobias.johannes.klausmann@....thm.de>
To:     kvalo@...eaurora.org, davem@...emloft.net,
        ath10k@...ts.infradead.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        nicoleotsuka@...il.com, hch@....de, m.szyprowski@...sung.com,
        robin.murphy@....com, iommu@...ts.linux-foundation.org
Cc:     tobias.klausmann@...enet.de
Subject: regression in ath10k dma allocation

Hello all,

within the current development cycle i noted the ath10k driver failing 
to setup:

[    3.185660] ath10k_pci 0000:02:00.0: failed to alloc CE dest ring 1: -12
[    3.185664] ath10k_pci 0000:02:00.0: failed to allocate copy engine 
pipe 1: -12
[    3.185667] ath10k_pci 0000:02:00.0: failed to allocate copy engine 
pipes: -12
[    3.185669] ath10k_pci 0000:02:00.0: failed to setup resource: -12
[    3.185692] ath10k_pci: probe of 0000:02:00.0 failed with error -12

the actual failure comes from [1] and indeed bisecting brought me to a 
related commit "dma-contiguous: add dma_{alloc,free}_contiguous() 
helpers" [2]. Reverting the commit fixes the problem, yet this might 
just be the driver abusing the dma infrastructure, so hopefully someone 
can have a look at it, as i'm not familiar with the code!


[1]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wireless/ath/ath10k/ce.c?h=v5.3-rc4#n1650

[2]: 
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b1d2dc009dece4cd7e629419b52266ba51960a6b


Greetings,

Tobias