From: Niklas Cassel <cassel@kernel.org>
To: Koichiro Den <den@valinux.co.jp>
Cc: mani@kernel.org, kwilczynski@kernel.org, kishon@kernel.org,
bhelgaas@google.com, corbet@lwn.net, jingoohan1@gmail.com,
lpieralisi@kernel.org, robh@kernel.org, Frank.Li@nxp.com,
linux-pci@vger.kernel.org, linux-doc@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/3] PCI: dwc: ep: Return after clearing BAR-match inbound mapping
Date: Sat, 31 Jan 2026 15:25:37 +0100 [thread overview]
Message-ID: <aX4Q4RWMfXt085lL@fedora> (raw)
In-Reply-To: <20260131133655.218018-2-den@valinux.co.jp>
On Sat, Jan 31, 2026 at 10:36:53PM +0900, Koichiro Den wrote:
> dw_pcie_ep_clear_ib_maps() first checks whether the inbound mapping for
> a BAR is in BAR Match Mode (tracked via ep_func->bar_to_atu[bar]). Once
> found, the iATU region is disabled and the bookkeeping is cleared.
>
> BAR Match Mode and Address Match Mode mappings are mutually exclusive
> for a given BAR, so there is nothing left for the Address Match Mode
> teardown path to do after the BAR Match Mode mapping has been removed.
>
> Return early after clearing the BAR Match Mode mapping to avoid running
> the Address Match Mode teardown path. This makes the helper's intention
> explicit and helps detect incorrect use of pci_epc_set_bar().
>
> Link: https://lore.kernel.org/all/aXtrW7viGZfMNZur@ryzen/
> Suggested-by: Niklas Cassel <cassel@kernel.org>
> Signed-off-by: Koichiro Den <den@valinux.co.jp>
> ---
Reviewed-by: Niklas Cassel <cassel@kernel.org>
next prev parent reply other threads:[~2026-01-31 14:25 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-31 13:36 [PATCH 0/3] PCI: endpoint: Clarify pci_epc_set_bar() lifetime rules Koichiro Den
2026-01-31 13:36 ` [PATCH 1/3] PCI: dwc: ep: Return after clearing BAR-match inbound mapping Koichiro Den
2026-01-31 14:25 ` Niklas Cassel [this message]
2026-01-31 13:36 ` [PATCH 2/3] PCI: endpoint: pci-epf-test: Use dedicated pci_epf_bar for subrange mapping Koichiro Den
2026-01-31 17:35 ` Niklas Cassel
2026-01-31 13:36 ` [PATCH 3/3] PCI: endpoint: Document pci_epc_set_bar() caller ownership and lifetime rules Koichiro Den
2026-01-31 16:50 ` Niklas Cassel
2026-02-01 15:45 ` Koichiro Den
2026-02-01 21:37 ` Niklas Cassel
2026-02-01 21:59 ` Niklas Cassel
2026-02-02 5:59 ` Koichiro Den
2026-02-02 9:27 ` Niklas Cassel
2026-02-02 15:04 ` Koichiro Den
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