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Date: Wed, 25 Mar 2026 07:23:37 +0100
From: Niklas Cassel <cassel@kernel.org>
To: Koichiro Den <den@valinux.co.jp>
Cc: Jon Mason <jdmason@kudzu.us>, Dave Jiang <dave.jiang@intel.com>,
	Allen Hubbe <allenbh@gmail.com>,
	Manivannan Sadhasivam <mani@kernel.org>,
	Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kwilczynski@kernel.org>,
	Kishon Vijay Abraham I <kishon@kernel.org>,
	Bjorn Helgaas <bhelgaas@google.com>, Frank Li <Frank.Li@nxp.com>,
	Jerome Brunet <jbrunet@baylibre.com>,
	Lorenzo Pieralisi <lpieralisi@kernel.org>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	ntb@lists.linux.dev
Subject: Re: [PATCH v3 00/10] PCI: endpoint: pci-epf-vntb / NTB: epf: Enable
 per-doorbell bit handling
Message-ID: <acN_aZNICP15ybZZ@ryzen>
References: <20260323031544.2598111-1-den@valinux.co.jp>
 <7jkibbdz3m3vuq2kq2xxnkt2rjdt5v7itgowc7qormtwgnf6tv@krl5brfjul5y>
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In-Reply-To: <7jkibbdz3m3vuq2kq2xxnkt2rjdt5v7itgowc7qormtwgnf6tv@krl5brfjul5y>

Hello Koichiro,

On Tue, Mar 24, 2026 at 12:43:53AM +0900, Koichiro Den wrote:
> 
> - configfs knobs mutability and bounds checking, including (but not limited to)
>   db_count.
>   In my opinion, allowing updates after .bind() looks questionable, and
>   returning -EBUSY once bound seems more appropriate. I'm leaning toward
>   handling this as a separate hardening series.

This is in line with what we did for pci-epf-test, see commit:
ffcc4850a161 ("PCI: endpoint: pci-epf-test: Allow overriding default BAR sizes")

but we return EOPNOTSUPP instead of EBUSY.


Kind regards,
Niklas