linux-kernel - Re: [PATCH v2 05/11] firewall: introduce stm32

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Message-ID: <ZMEF/gR6fmmC7jhF@corigine.com>
Date:   Wed, 26 Jul 2023 13:39:42 +0200
From:   Simon Horman <simon.horman@...igine.com>
To:     Gatien CHEVALLIER <gatien.chevallier@...s.st.com>
Cc:     Oleksii_Moisieiev@...m.com, gregkh@...uxfoundation.org,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
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        vkoul@...nel.org, jic23@...nel.org, olivier.moysan@...s.st.com,
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        will@...nel.org, catalin.marinas@....com, arnd@...nel.org,
        richardcochran@...il.com, Frank Rowand <frowand.list@...il.com>,
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Subject: Re: [PATCH v2 05/11] firewall: introduce stm32_firewall framework

On Wed, Jul 26, 2023 at 12:38:00PM +0200, Gatien CHEVALLIER wrote:
> 
> 
> On 7/26/23 12:19, Simon Horman wrote:
> > On Tue, Jul 25, 2023 at 06:40:58PM +0200, Gatien Chevallier wrote:
> > > Introduce a STM32 firewall framework that offers to firewall consumers
> > > different firewall services such as the ability to check their access
> > > rights against their firewall controller(s).
> > > 
> > > The STM32 firewall framework offers a generic API for STM32 firewall
> > > controllers that is defined in their drivers to best fit the
> > > specificity of each firewall.
> > > 
> > > There are various types of firewalls:
> > > -Peripheral firewalls that filter accesses to peripherals
> > > -Memory firewalls that filter accesses to memories or memory regions
> > > -No type for undefined type of firewall
> > > 
> > > Signed-off-by: Gatien Chevallier <gatien.chevallier@...s.st.com>
> > 
> > ...
> > 
> > > diff --git a/drivers/bus/stm32_firewall.c b/drivers/bus/stm32_firewall.c
> > 
> > ...
> > 
> > > +int stm32_firewall_populate_bus(struct stm32_firewall_controller *firewall_controller)
> > > +{
> > > +	struct stm32_firewall *firewalls;
> > > +	struct device_node *child;
> > > +	struct device *parent;
> > > +	unsigned int i;
> > > +	int len;
> > > +	int err;
> > > +
> > > +	parent = firewall_controller->dev;
> > > +
> > > +	dev_dbg(parent, "Populating %s system bus\n", dev_name(firewall_controller->dev));
> > > +
> > > +	for_each_available_child_of_node(dev_of_node(parent), child) {
> > > +		/* The feature-domains property is mandatory for firewall bus devices */
> > > +		len = of_count_phandle_with_args(child, "feature-domains", "#feature-domain-cells");
> > > +		if (len <= 0)
> > 
> > Coccinelle says that, due to breaking out of a
> > for_each_available_child_of_node() loop, a call to of_node_put()
> > is needed here
> > 
> 
> Hi Simon,
> 
> Thank you, I already sent a V3 correcting the patch ordering issue. I
> will implement this for V4.

Hi Gatien,

Thanks and sorry for not noticing v3 - I think it arrived while
I was in the middle of reviewing v2.