linux-kernel - Re: [PATCH v6 2/7] dma: avoid redundant calls for sync operations

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Message-ID: <20240509134924.GA13607@lst.de>
Date: Thu, 9 May 2024 15:49:24 +0200
From: Christoph Hellwig <hch@....de>
To: Steven Price <steven.price@....com>
Cc: Alexander Lobakin <aleksander.lobakin@...el.com>,
	Christoph Hellwig <hch@....de>, Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>, Joerg Roedel <joro@...tes.org>,
	Will Deacon <will@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Magnus Karlsson <magnus.karlsson@...el.com>,
	nex.sw.ncis.osdt.itp.upstreaming@...el.com, bpf@...r.kernel.org,
	netdev@...r.kernel.org, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 2/7] dma: avoid redundant calls for sync operations

On Thu, May 09, 2024 at 02:43:52PM +0100, Steven Price wrote:
> The specific drivers are "rockchip-drm" and "rk_gmac-dwmac". Is it a
> requirement that all drivers engaging in DMA should call dma_set_mask()
> - and therefore this has uncovered a bug in those drivers. Or is the
> assumption that all drivers call dma_set_mask() faulty?

That was the assumption behind the code, but the assumption is wrong.
Alex is working on a fix.