linux-kernel - Re: [PATCH v3 1/7] mfd: syscon: Add reference counting and device managed support

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Message-ID: <91cfc410-744f-49f8-8331-733c41a43121@web.de>
Date: Thu, 11 Jul 2024 18:09:26 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Clément Léger <clement.leger@...tlin.com>,
 Herve Codina <herve.codina@...tlin.com>, devicetree@...r.kernel.org,
 linux-pci@...r.kernel.org, netdev@...r.kernel.org,
 UNGLinuxDriver@...rochip.com, linux-arm-kernel@...ts.infradead.org,
 Andy Shevchenko <andy.shevchenko@...il.com>, Arnd Bergmann <arnd@...db.de>,
 Bjorn Helgaas <bhelgaas@...gle.com>, Conor Dooley <conor+dt@...nel.org>,
 Daniel Machon <daniel.machon@...rochip.com>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Lars Povlsen <lars.povlsen@...rochip.com>, Lee Jones <lee@...nel.org>,
 Philipp Zabel <p.zabel@...gutronix.de>, Rob Herring <robh@...nel.org>,
 Saravana Kannan <saravanak@...gle.com>, Simon Horman <horms@...nel.org>,
 Steen Hegelund <Steen.Hegelund@...rochip.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Allan Nielsen <allan.nielsen@...rochip.com>, Andrew Lunn <andrew@...n.ch>,
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Horatiu Vultur <horatiu.vultur@...rochip.com>,
 Jakub Kicinski <kuba@...nel.org>, Luca Ceresoli <luca.ceresoli@...tlin.com>,
 Paolo Abeni <pabeni@...hat.com>,
 Steen Hegelund <steen.hegelund@...rochip.com>,
 Thomas Petazzoni <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v3 1/7] mfd: syscon: Add reference counting and device
 managed support

…
> +++ b/drivers/mfd/syscon.c
…
> +static struct syscon *syscon_from_regmap(struct regmap *regmap)
+{
> +	struct syscon *entry, *syscon = NULL;
> +
> +	spin_lock(&syscon_list_slock);
> +
> +	list_for_each_entry(entry, &syscon_list, list)
…
> +	spin_unlock(&syscon_list_slock);
> +
> +	return syscon;
> +}
…

Under which circumstances would you become interested to apply a statement
like “guard(spinlock)(&syscon_list_slock);”?
https://elixir.bootlin.com/linux/v6.10-rc7/source/include/linux/spinlock.h#L561

Regards,
Markus