diff mbox series

[v3,03/11] PCI: microchip: enable building this driver as a module

Message ID 20230111125323.1911373-4-daire.mcnamara@microchip.com (mailing list archive)
State New, archived
Delegated to: Lorenzo Pieralisi
Headers show
Series PCI: microchip: Partition address translations | expand

Commit Message

Daire McNamara Jan. 11, 2023, 12:53 p.m. UTC 
From: Daire McNamara <daire.mcnamara@microchip.com>

Enable building this driver as a module. The expected use case is the
driver is built as a module, is installed when needed, and cannot be
removed once installed.

The remove() callback is not implemented as removing a driver with
INTx and MSI interrupt handling is inherently unsafe.

Link: https://lore.kernel.org/linux-pci/87y1wgbah8.wl-maz@kernel.org/
Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>
---
 drivers/pci/controller/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

Comments

Uwe Kleine-König Jan. 11, 2023, 5:25 p.m. UTC | #1 
Hello,

On Wed, Jan 11, 2023 at 12:53:15PM +0000, daire.mcnamara@microchip.com wrote:
> From: Daire McNamara <daire.mcnamara@microchip.com>
> 
> Enable building this driver as a module. The expected use case is the
> driver is built as a module, is installed when needed, and cannot be
> removed once installed.
> 
> The remove() callback is not implemented as removing a driver with
> INTx and MSI interrupt handling is inherently unsafe.

Note this is a misconception. Not providing a remove callback doesn't
prevent the driver from being unbound.

However the driver has

	.suppress_bind_attrs = true,

which prevents unbinding. (So the patch looks fine to me, just the
commit log could be improved.)

Best regards
Uwe
Conor Dooley Jan. 11, 2023, 6:20 p.m. UTC | #2 
On Wed, Jan 11, 2023 at 12:53:15PM +0000, daire.mcnamara@microchip.com wrote:
> From: Daire McNamara <daire.mcnamara@microchip.com>
> 
> Enable building this driver as a module. The expected use case is the
> driver is built as a module, is installed when needed, and cannot be
> removed once installed.
> 
> The remove() callback is not implemented as removing a driver with
> INTx and MSI interrupt handling is inherently unsafe.
> 
> Link: https://lore.kernel.org/linux-pci/87y1wgbah8.wl-maz@kernel.org/
> Suggested-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
> Signed-off-by: Daire McNamara <daire.mcnamara@microchip.com>

Perhaps, if nothing else crops up, Uwe's comment about the commit
message can be addressed on application?

Either way,
Acked-by: Conor Dooley <conor.dooley@microchip.com>

Thanks!

> ---
>  drivers/pci/controller/Kconfig | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
> index 76806dc52d1b..fd005b3f8a24 100644
> --- a/drivers/pci/controller/Kconfig
> +++ b/drivers/pci/controller/Kconfig
> @@ -291,7 +291,7 @@ config PCI_LOONGSON
>  	  Loongson systems.
>  
>  config PCIE_MICROCHIP_HOST
> -	bool "Microchip AXI PCIe host bridge support"
> +	tristate "Microchip AXI PCIe host bridge support"
>  	depends on PCI_MSI
>  	select PCI_MSI_IRQ_DOMAIN
>  	select GENERIC_MSI_IRQ_DOMAIN
> -- 
> 2.25.1
> 
> 
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diff mbox series

Patch

diff --git a/drivers/pci/controller/Kconfig b/drivers/pci/controller/Kconfig
index 76806dc52d1b..fd005b3f8a24 100644
--- a/drivers/pci/controller/Kconfig
+++ b/drivers/pci/controller/Kconfig
@@ -291,7 +291,7 @@  config PCI_LOONGSON
 	  Loongson systems.
 
 config PCIE_MICROCHIP_HOST
-	bool "Microchip AXI PCIe host bridge support"
+	tristate "Microchip AXI PCIe host bridge support"
 	depends on PCI_MSI
 	select PCI_MSI_IRQ_DOMAIN
 	select GENERIC_MSI_IRQ_DOMAIN