linux-kernel - Re: alpha boot hang

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Date:   Wed, 25 Oct 2017 18:54:48 +0300 (EEST)
From:   Meelis Roos <mroos@...ux.ee>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
cc:     linux-alpha@...r.kernel.org,
        Linux Kernel list <linux-kernel@...r.kernel.org>,
        linux-pci@...r.kernel.org
Subject: Re: alpha boot hang - 4.14-rc* regression

> > > > > > removing libata modules and rebooting fixes it - so it seems to be 
> > > > > > loading of libata.
> > > > > 
> > > > > Can you please cherry-pick:
> > > > > 
> > > > > commit b1f9e5e355e9 ("ide: fix IRQ assignment for PCI bus order probing")
> > > > > 
> > > > > from mainline and let us know if that solves the issue ?
> > > > 
> > > > No, still breaks the same way (b1f9e5e355e9 patched on top of 
> > > > 0e4c2eeb758a).
> > > > 
> > > > 4.14.0-rc5-00095-g1c9fec470b81 was also still broken the same way (tried 
> > > > on Sunday).
> > > 
> > > I am not sure I patched the right sys file but if I did, does the patch
> > > below help ?
> > > 
> > > I think that at sata driver binding time the kernel finds a freed
> > > pointer in the host bridge map_irq() hook and that's where things
> > > go wrong.
> > > 
> > > Please let me know if that's the right sys file, it is a mechanical
> > > change and making it for other sys file should be reasonably simple.
> > > 
> > > Lorenzo
> > > 
> > > -- >8 --
> > > diff --git a/arch/alpha/kernel/sys_dp264.c b/arch/alpha/kernel/sys_dp264.c
> > 
> > "Booting GENERIC on Tsunami variation Webbrick using machine vector 
> > Webbrick from SRM"
> > 
> > Seems to be the correct file - tsunami is referenced from this file and 
> > the IRQ-s are DP264.
> > 
> > But the patch does not make a difference :(
> 
> It is probably because I patched the wrong map_irq() function,
> I am trying to detect which one you are _actually_ using, if
> the patch below fails I will patch them all (which is what I
> have to do anyway).
> 
> Please give this a go - this _has_ to make a difference, it is not
> correct to leave map_irq() pointers as __init memory, IRQ routing
> for modules can't work.

Yes, webrick entry seems to be the correct one fro DS10L. It works fine 
on top of the cherry-picked ATA IRQ patch.

Will try it on top of current mainline git.

-- 
Meelis Roos (mroos@...ux.ee)