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Re: [PATCH v2 07/11] PCI: MSI: Use never-managed version of pci_intx()
- To: Philipp Stanner <pstanner@xxxxxxxxxx>, Damien Le Moal <dlemoal@xxxxxxxxxx>, Niklas Cassel <cassel@xxxxxxxxxx>, Basavaraj Natikar <basavaraj.natikar@xxxxxxx>, Jiri Kosina <jikos@xxxxxxxxxx>, Benjamin Tissoires <bentiss@xxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>, Alex Dubov <oakad@xxxxxxxxx>, Sudarsana Kalluru <skalluru@xxxxxxxxxxx>, Manish Chopra <manishc@xxxxxxxxxxx>, Andrew Lunn <andrew+netdev@xxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Rasesh Mody <rmody@xxxxxxxxxxx>, GR-Linux-NIC-Dev@xxxxxxxxxxx, Igor Mitsyanko <imitsyanko@xxxxxxxxxxxxx>, Sergey Matyukevich <geomatsi@xxxxxxxxx>, Kalle Valo <kvalo@xxxxxxxxxx>, Sanjay R Mehta <sanju.mehta@xxxxxxx>, Shyam Sundar S K <Shyam-sundar.S-k@xxxxxxx>, Jon Mason <jdmason@xxxxxxxx>, Dave Jiang <dave.jiang@xxxxxxxxx>, Allen Hubbe <allenbh@xxxxxxxxx>, Bjorn Helgaas <bhelgaas@xxxxxxxxxx>, Alex Williamson <alex.williamson@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, Philipp Stanner <pstanner@xxxxxxxxxx>, Mario Limonciello <mario.limonciello@xxxxxxx>, Chen Ni <nichen@xxxxxxxxxxx>, Ricky Wu <ricky_wu@xxxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Breno Leitao <leitao@xxxxxxxxxx>, Kevin Tian <kevin.tian@xxxxxxxxx>, Mostafa Saleh <smostafa@xxxxxxxxxx>, Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>, Jason Gunthorpe <jgg@xxxxxxxx>, Yi Liu <yi.l.liu@xxxxxxxxx>, Kunwu Chan <chentao@xxxxxxxxxx>, Ankit Agrawal <ankita@xxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Reinette Chatre <reinette.chatre@xxxxxxxxx>, Eric Auger <eric.auger@xxxxxxxxxx>, Ye Bin <yebin10@xxxxxxxxxx>
- From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
- Date: Fri, 15 Nov 2024 16:35:22 +0100
- Cc: linux-ide@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-input@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, linux-wireless@xxxxxxxxxxxxxxx, ntb@xxxxxxxxxxxxxxx, linux-pci@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Fri, 15 Nov 2024 15:35:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Wed, Nov 13 2024 at 13:41, Philipp Stanner wrote:
> pci_intx() is a hybrid function which can sometimes be managed through
> devres. To remove this hybrid nature from pci_intx(), it is necessary to
> port users to either an always-managed or a never-managed version.
>
> MSI sets up its own separate devres callback implicitly in
> pcim_setup_msi_release(). This callback ultimately uses pci_intx(),
> which is problematic since the callback of course runs on driver-detach.
>
> That problem has last been described here:
> https://lore.kernel.org/all/ee44ea7ac760e73edad3f20b30b4d2fff66c1a85.camel@xxxxxxxxxx/
>
> Replace the call to pci_intx() with one to the never-managed version
> pci_intx_unmanaged().
>
> Signed-off-by: Philipp Stanner <pstanner@xxxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
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