Re: [PATCH v6 00/11] PCI: Drop duplicated tracking of a pci_dev's bound driver

Uwe Kleine-König
2021-10-13T08:53:27Z

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On Tue, Oct 12, 2021 at 06:32:12PM -0500, Bjorn Helgaas wrote:
> On Mon, Oct 04, 2021 at 02:59:24PM +0200, Uwe Kleine-König wrote:
> > Hello,
> >
> > this is v6 of the quest to drop the "driver" member from struct pci_dev
> > which tracks the same data (apart from a constant offset) as dev.driver.
>
> I like this a lot and applied it to pci/driver for v5.16, thanks!
>
> I split some of the bigger patches apart so they only touched one
> driver or subsystem at a time. I also updated to_pci_driver() so it
> returns NULL when given NULL, which makes some of the validations
> quite a bit simpler, especially in the PM code in pci-driver.c.

OK.

> Full interdiff from this v6 series:
>
> diff --git a/arch/x86/kernel/probe_roms.c b/arch/x86/kernel/probe_roms.c
> index deaaef6efe34..36e84d904260 100644
> --- a/arch/x86/kernel/probe_roms.c
> +++ b/arch/x86/kernel/probe_roms.c
> @@ -80,17 +80,15 @@ static struct resource video_rom_resource = {
> */
> static bool match_id(struct pci_dev *pdev, unsigned short vendor, unsigned short device)
> {
> + struct pci_driver *drv = to_pci_driver(pdev->dev.driver);
> const struct pci_device_id *id;
>
> if (pdev->vendor == vendor && pdev->device == device)
> return true;
>
> - if (pdev->dev.driver) {
> - struct pci_driver *drv = to_pci_driver(pdev->dev.driver);
> - for (id = drv->id_table; id && id->vendor; id++)
> - if (id->vendor == vendor && id->device == device)
> - break;
> - }
> + for (id = drv ? drv->id_table : NULL; id && id->vendor; id++)
> + if (id->vendor == vendor && id->device == device)
> + break;
>
> return id && id->vendor;
> }
> diff --git a/drivers/misc/cxl/guest.c b/drivers/misc/cxl/guest.c
> index d997c9c3ebb5..7eb3706cf42d 100644
> --- a/drivers/misc/cxl/guest.c
> +++ b/drivers/misc/cxl/guest.c
> @@ -20,38 +20,38 @@ static void pci_error_handlers(struct cxl_afu *afu,
> pci_channel_state_t state)
> {
> struct pci_dev *afu_dev;
> + struct pci_driver *afu_drv;
> + struct pci_error_handlers *err_handler;

These two could be moved into the for loop (where afu_drv was with my
patch already). This is also possible in a few other drivers.

Best regards
Uwe

--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |

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