Re: Root filesystem read access for firmware load during hibernation image writing

[Luis Chamberlain]

On Fri, Oct 11, 2024 at 04:39:53PM -0700, Darrick J. Wong wrote:
> On Fri, Oct 11, 2024 at 04:11:49PM -0700, Luis Chamberlain wrote:
> 
> Reads are generally supposed to succeed on a suspended system but if the
> read causes a write (e.g. atime update) they can block just like a write
> would.  So in the end you probably have to cache the firmware blobs in a
> tmpfs or something like that.

The fw cache stuff caches is it in memory to avoid these races on resume.

> > So.. we just now gotta respin the latest effort. I had stopped because
> > I know Darrick had some changes which he needed to get in sooner but
> 
> Do you remember what changes those were?  I don't. :(

Yeah I have a random tree somewhere lemme see...

https://git.kernel.org/pub/scm/linux/kernel/git/mcgrof/linux-next.git/log/?h=20230507-fs-freeze

Fortunately most of it is coccinelle smpl so should be easy to rebase.

  Luis