linux-kernel - Re: [PATCH v2 08/13] PCI: apple: Set only available ports up

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250325132531.GA1717731-robh@kernel.org>
Date: Tue, 25 Mar 2025 08:25:31 -0500
From: Rob Herring <robh@...nel.org>
To: Marc Zyngier <maz@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org, linux-pci@...r.kernel.org,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	asahi@...ts.linux.dev, Alyssa Rosenzweig <alyssa@...enzweig.io>,
	Janne Grunau <j@...nau.net>, Hector Martin <marcan@...can.st>,
	Sven Peter <sven@...npeter.dev>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>, stable@...r.kernel.org
Subject: Re: [PATCH v2 08/13] PCI: apple: Set only available ports up

On Tue, Mar 25, 2025 at 10:26:05AM +0000, Marc Zyngier wrote:
> From: Janne Grunau <j@...nau.net>
> 
> Iterating over disabled ports results in of_irq_parse_raw() parsing
> the wrong "interrupt-map" entries, as it takes the status of the node
> into account.
> 
> Switching from for_each_child_of_node() to for_each_available_child_of_node()
> solves this issue.

I really wish "available" was the default iterator...

> 
> This became apparent after disabling unused PCIe ports in the Apple
> Silicon device trees instead of deleting them.
> 
> Link: https://lore.kernel.org/asahi/20230214-apple_dts_pcie_disable_unused-v1-0-5ea0d3ddcde3@jannau.net/
> Link: https://lore.kernel.org/asahi/1ea2107a-bb86-8c22-0bbc-82c453ab08ce@linaro.org/
> Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
> Cc: stable@...r.kernel.org

Fixes especially for stable should go first in the series.

> Signed-off-by: Janne Grunau <j@...nau.net>
> Signed-off-by: Alyssa Rosenzweig <alyssa@...enzweig.io>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> ---
>  drivers/pci/controller/pcie-apple.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index 6271533f1b042..23d9f62bd2ad4 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -747,7 +747,7 @@ static int apple_pcie_init(struct pci_config_window *cfg)
>  	struct device_node *of_port;
>  	int ret;
>  
> -	for_each_child_of_node(dev->of_node, of_port) {
> +	for_each_available_child_of_node(dev->of_node, of_port) {
>  		ret = apple_pcie_setup_port(pcie, of_port);
>  		if (ret) {
>  			dev_err(dev, "Port %pOF setup fail: %d\n", of_port, ret);
> -- 
> 2.39.2
>