linux-kernel - Re: [PATCH v2 4/8] PCI: brcmstb: Fix error path upon call of regulator_bulk

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Message-ID: <20250304150313.ey4fky35bu6dbtxd@thinkpad>
Date: Tue, 4 Mar 2025 20:33:13 +0530
From: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
To: Jim Quinlan <james.quinlan@...adcom.com>
Cc: linux-pci@...r.kernel.org, Nicolas Saenz Julienne <nsaenz@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Cyril Brulebois <kibi@...ian.org>,
	Stanimir Varbanov <svarbanov@...e.de>,
	bcm-kernel-feedback-list@...adcom.com, jim2101024@...il.com,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	Krzysztof Wilczyński <kw@...ux.com>,
	Rob Herring <robh@...nel.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-rpi-kernel@...ts.infradead.org>,
	"moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 4/8] PCI: brcmstb: Fix error path upon call of
 regulator_bulk_get()

On Fri, Feb 14, 2025 at 12:39:32PM -0500, Jim Quinlan wrote:
> If regulator_bulk_get() returns an error, no regulators are created and we
> need to set their number to zero.  If we do not do this and the PCIe
> link-up fails, regulator_bulk_free() will be invoked and effect a panic.
> 
> Also print out the error value, as we cannot return an error upwards as
> Linux will WARN on an error from add_bus().
> 
> Fixes: 9e6be018b263 ("PCI: brcmstb: Enable child bus device regulators from DT")
> Signed-off-by: Jim Quinlan <james.quinlan@...adcom.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index e0b20f58c604..56b49d3cae19 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -1416,7 +1416,8 @@ static int brcm_pcie_add_bus(struct pci_bus *bus)
>  
>  		ret = regulator_bulk_get(dev, sr->num_supplies, sr->supplies);
>  		if (ret) {
> -			dev_info(dev, "No regulators for downstream device\n");
> +			dev_info(dev, "Did not get regulators; err=%d\n", ret);

Why is this dev_info() instead of dev_err()?

> +			pcie->sr = NULL;

Why can't you set 'pcie->sr' after successfull regulator_bulk_get()?

- Mani

-- 
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