From: Keith Busch <kbusch@kernel.org>
To: Matthew Wood <thepacketgeek@gmail.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
Nikita Vetoshkin <nekto0n@meta.com>
Subject: Re: [PATCH 2/5] PCI/sysfs: Use user config accessors for bus number attributes
Date: Mon, 26 Oct 2026 09:00:28 -0600 [thread overview]
Message-ID: <at9rDMzMCXpaQgPB@kbusch-mbp> (raw)
In-Reply-To: <20261025000836.58294-3-thepacketgeek@gmail.com>
On Sat, Oct 24, 2026 at 05:08:30PM -0700, Matthew Wood wrote:
> secondary_bus_number and subordinate_bus_number read config space with
> pci_read_config_byte(). The kernel config accessors don't check
> block_cfg_access, so a read that races with a reset goes to the device
> mid-reset and can fail or return a bogus bus number.
>
> Use pci_user_read_config_byte() instead, as the "config" attribute does,
> so the read waits for any pci_cfg_access_lock() holder (e.g.
> pci_reset_function()) to finish.
Looks good.
Reviewed-by: Keith Busch <kbusch@kernel.org>
next prev parent reply other threads:[~2026-10-26 15:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-25 0:08 [PATCH 0/5] PCI/sysfs: Wait for config access lock in sysfs attributes Matthew Wood
2026-10-25 0:08 ` [PATCH 1/5] PCI: Add disconnected device checks to user config reads Matthew Wood
2026-10-25 0:08 ` [PATCH 2/5] PCI/sysfs: Use user config accessors for bus number attributes Matthew Wood
2026-10-26 15:00 ` Keith Busch [this message]
2026-10-25 0:08 ` [PATCH 3/5] PCI: Add pcie_capability_user_read_{word,dword}() Matthew Wood
2026-10-26 15:20 ` Keith Busch
2026-10-25 0:08 ` [PATCH 4/5] PCI/sysfs: Use user config accessors for link attributes Matthew Wood
2026-10-26 15:21 ` Keith Busch
2026-10-25 0:08 ` [PATCH 5/5] PCI/sysfs: Use user config accessors for serial_number Matthew Wood
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