Messages in this thread | | | Date | Wed, 17 Jan 2018 15:52:49 +0800 | From | JeffyChen <> | Subject | Re: [PATCH v2 12/13] iommu/rockchip: Add runtime PM support |
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Hi Tomasz,
On 01/17/2018 03:38 PM, Tomasz Figa wrote: >>> >>Don't we need to check here (and in _shutdown() too) if we have a >>> >>domain attached? >> > >> >hmmm, right, the startup might been called by resume, so should check >> >iommu->domain here. >> > >> >but the shutdown would be called at the end of detach or suspend, it could >> >be not attached or attached. > If startup might be called by resume, without domain attached, what > prevents shutdown from being called by suspend after that resume, > still without domain attached? Is it guaranteed that if resume is > called, someone will attach a domain before suspend is called? > no, the shutdown would be called by: 1/ end of detach_dev so it would be not attached at that time
2/ suspend so it could be attached, and also could be not attached
anyway, i think the shutdown would work without domain attached(just disable paging and clear the iommu bases) ;)
> Best regards, > Tomasz > > >
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