linux-kernel - Re: [PATCH v5 -next 09/11] PCI: brcmstb: Fix for missing of_node

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Message-ID: <151116ad-b671-4f4d-a231-6b2288d08158@suse.de>
Date: Mon, 27 Jan 2025 18:04:39 +0200
From: Stanimir Varbanov <svarbanov@...e.de>
To: Stanimir Varbanov <svarbanov@...e.de>,
 Florian Fainelli <florian.fainelli@...adcom.com>,
 linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, linux-rpi-kernel@...ts.infradead.org,
 linux-pci@...r.kernel.org,
 Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>
Cc: Thomas Gleixner <tglx@...utronix.de>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Jim Quinlan <jim2101024@...il.com>,
 Nicolas Saenz Julienne <nsaenz@...nel.org>,
 Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>, kw@...ux.com,
 Philipp Zabel <p.zabel@...gutronix.de>,
 Andrea della Porta <andrea.porta@...e.com>,
 Phil Elwell <phil@...pberrypi.com>, Jonathan Bell
 <jonathan@...pberrypi.com>, Dave Stevenson <dave.stevenson@...pberrypi.com>,
 stable@...r.kernel.org
Subject: Re: [PATCH v5 -next 09/11] PCI: brcmstb: Fix for missing of_node_put

Hi,

On 1/22/25 6:20 PM, Stanimir Varbanov wrote:
> Hi Florian,
> 
> On 1/21/25 8:32 PM, Florian Fainelli wrote:
>> On 1/20/25 05:01, Stanimir Varbanov wrote:
>>> A call to of_parse_phandle() increments refcount, of_node_put must be
>>> called when done the work on it. Fix missing of_node_put() on the
>>> msi_np device node by using scope based of_node_put() cleanups.
>>>
>>> Cc: stable@...r.kernel.org # v5.10+
>>> Fixes: 40ca1bf580ef ("PCI: brcmstb: Add MSI support")
>>> Signed-off-by: Stanimir Varbanov <svarbanov@...e.de>
>>> ---
>>> v4 -> v5:
>>>   - New patch in the series.
>>>
>>>   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 744fe1a4cf9c..546056f7f0d3 100644
>>> --- a/drivers/pci/controller/pcie-brcmstb.c
>>> +++ b/drivers/pci/controller/pcie-brcmstb.c
>>> @@ -1844,7 +1844,8 @@ static struct pci_ops brcm7425_pcie_ops = {
>>>     static int brcm_pcie_probe(struct platform_device *pdev)
>>>   {
>>> -    struct device_node *np = pdev->dev.of_node, *msi_np;
>>> +    struct device_node *msi_np __free(device_node) = NULL;
>>
>> In the interest of making this a straight back port to 5.10 that does
>> not have all of the __free() goodies, I would just add the missing
>> of_node_put() where necessary.
> 
> Good point. Thank you.
> 
>>
>> Also, since this is a bug fix, you should probably make it appear
>> earlier in the patch series, or even sent it as a separate fix entirely.
> 
> OK, will send it as a standalone patch (as v2 with your comment addressed).

Sent here [1], now separate from this series.

~Stan

[1]
https://lore.kernel.org/lkml/20250122222955.1752778-1-svarbanov@suse.de/T/