linux-kernel - Re: [PATCH] PCI: apple: Initialize pcie->nvecs before using it

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Message-ID: <20230624170433.GE2636347@rocinante>
Date:   Sun, 25 Jun 2023 02:04:33 +0900
From:   Krzysztof Wilczyński <kw@...ux.com>
To:     Sven Peter <sven@...npeter.dev>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        asahi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: apple: Initialize pcie->nvecs before using it

Hello,

> apple_pcie_setup_port computes ilog2(pcie->nvecs) to setup the number of
> MSIs available for each port. It is however called before apple_msi_init
> which actually initializes pcie->nvecs.
> Luckily, pcie->nvecs is part of kzalloc-ed structure and thus
> initialized as zero. ilog2(0) happens to be 0xffffffff which then just
> configures more MSIs in hardware than we actually have. This doesn't
> break anything because we never hand out those vectors.
> Let's swap the order of the two calls so that we use the correctly
> initialized value.

Applied to controller/apple, thank you!

[1/1] PCI: apple: Initialize pcie->nvecs before use
      https://git.kernel.org/pci/pci/c/328a16477027

	Krzysztof