linux-kernel - Re: [PATCH] powerpc, ocxl: Fix extraction of struct xive_irq

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Message-ID: <68ed2dad.170a0220.37a345.0a48@mx.google.com>
Date: Mon, 13 Oct 2025 22:16:25 +0530
From: Ritesh Harjani (IBM) <ritesh.list@...il.com>
To: Nam Cao <namcao@...utronix.de>, Madhavan Srinivasan <maddy@...ux.ibm.com>, Nicholas Piggin <npiggin@...il.com>, Michael Ellerman <mpe@...erman.id.au>, Christophe Leroy <christophe.leroy@...roup.eu>, Frederic Barrat <fbarrat@...ux.ibm.com>, Andrew Donnellan <ajd@...ux.ibm.com>
Cc: Arnd Bergmann <arnd@...db.de>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Nam Cao <namcao@...utronix.de>, Thomas Gleixner <tglx@...utronix.de>, linuxppc-dev@...ts.ozlabs.org, kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] powerpc, ocxl: Fix extraction of struct xive_irq_data

Nam Cao <namcao@...utronix.de> writes:

> Commit cc0cc23babc9 ("powerpc/xive: Untangle xive from child interrupt
> controller drivers") changed xive_irq_data to be stashed to chip_data
> instead of handler_data. However, multiple places are still attempting to
> read xive_irq_data from handler_data and get a NULL pointer deference bug.
>
> Update them to read xive_irq_data from chip_data.
>
> Non-XIVE files which touch xive_irq_data seem quite strange to me,
> especially the ocxl driver. I think there ought to be an alternative
> platform-independent solution, instead of touching XIVE's data directly.
> Therefore, I think this whole thing should be cleaned up. But perhaps I
> just misunderstand something. In any case, this cleanup would not be
> trivial; for now, just get things working again.
>
> Fixes: cc0cc23babc9 ("powerpc/xive: Untangle xive from child interrupt controller drivers")
> Reported-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>
> Closes: https://lore.kernel.org/linuxppc-dev/68e48df8.170a0220.4b4b0.217d@mx.google.com/
> Signed-off-by: Nam Cao <namcao@...utronix.de>


Thanks Nam for the fix. I validated this with KVM on my POWER9 hardware and
this patch fixes the previosly reported problem at my end.

Feel free to add:
Tested-by: Ritesh Harjani (IBM) <ritesh.list@...il.com> # KVM

-ritesh