From: robin.murphy@arm•com (Robin Murphy)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH] ARM64: dma-mapping: fix handling of devices registered before arch_initcall
Date: Tue, 16 Feb 2016 19:05:59 +0000 [thread overview]
Message-ID: <56C37317.9020104@arm.com> (raw)
In-Reply-To: <1455632084-14666-1-git-send-email-m.szyprowski@samsung.com>
On 16/02/16 14:14, Marek Szyprowski wrote:
> This patch ensures that devices, which got registered before arch_initcall
> will be handled correctly by IOMMU-based DMA-mapping code.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@samsung•com>
> ---
> arch/arm64/mm/dma-mapping.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c
> index 573b1e6..ce6019f 100644
> --- a/arch/arm64/mm/dma-mapping.c
> +++ b/arch/arm64/mm/dma-mapping.c
> @@ -928,6 +928,10 @@ static int __init __iommu_dma_init(void)
> ret = register_iommu_dma_ops_notifier(&platform_bus_type);
> if (!ret)
> ret = register_iommu_dma_ops_notifier(&amba_bustype);
> +
> + /* handle devices queued before this arch_initcall */
> + if (!ret)
> + __iommu_attach_notifier(NULL, BUS_NOTIFY_ADD_DEVICE, NULL);
Hmm, surely unless *all* the devices on the relevant buses are created
before arch_initcall level, then the next one is going to kick off the
notifier to walk the whole list anyway. Have you seen this being a
problem in practice?
Robin.
> return ret;
> }
> arch_initcall(__iommu_dma_init);
>
next prev parent reply other threads:[~2016-02-16 19:05 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-16 14:14 [PATCH] ARM64: dma-mapping: fix handling of devices registered before arch_initcall Marek Szyprowski
2016-02-16 19:05 ` Robin Murphy [this message]
2016-02-17 7:06 ` Marek Szyprowski
2016-02-17 10:19 ` Robin Murphy
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