linux-kernel - Re: [PATCH 1/2] pci: Add pci device even if the driver failed to attach

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Date:   Fri, 26 Jun 2020 10:39:06 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Rajat Jain <rajatja@...gle.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Len Brown <lenb@...nel.org>, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-acpi@...r.kernel.org, Raj Ashok <ashok.raj@...el.com>,
        lalithambika.krishnakumar@...el.com,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Prashant Malani <pmalani@...gle.com>,
        Benson Leung <bleung@...gle.com>,
        Todd Broch <tbroch@...gle.com>,
        Alex Levin <levinale@...gle.com>,
        Mattias Nissler <mnissler@...gle.com>,
        Rajat Jain <rajatxjain@...il.com>,
        Bernie Keany <bernie.keany@...el.com>,
        Aaron Durbin <adurbin@...gle.com>,
        Diego Rivas <diegorivas@...gle.com>,
        Duncan Laurie <dlaurie@...gle.com>,
        Furquan Shaikh <furquan@...gle.com>,
        Jesse Barnes <jsbarnes@...gle.com>,
        Christian Kellner <christian@...lner.me>,
        Alex Williamson <alex.williamson@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        oohall@...il.com
Subject: Re: [PATCH 1/2] pci: Add pci device even if the driver failed to
 attach

Nit: when you update these patches, can you run "git log --oneline
drivers/pci/bus.c" and make your subject lines match the convention?
E.g.,

  PCI: Add device even if driver attach failed

On Thu, Jun 25, 2020 at 05:27:09PM -0700, Rajat Jain wrote:
> device_attach() returning failure indicates a driver error
> while trying to probe the device. In such a scenario, the PCI
> device should still be added in the system and be visible to
> the user.

Nit: please wrap logs to fill 75 characters.  "git log" adds 4 spaces
at the beginning, so 75+4 still fits nicely in 80 columns without
wrapping.

> This patch partially reverts:
> commit ab1a187bba5c ("PCI: Check device_attach() return value always")
> 
> Signed-off-by: Rajat Jain <rajatja@...gle.com>
> ---
>  drivers/pci/bus.c | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
> index 8e40b3e6da77d..3cef835b375fd 100644
> --- a/drivers/pci/bus.c
> +++ b/drivers/pci/bus.c
> @@ -322,12 +322,8 @@ void pci_bus_add_device(struct pci_dev *dev)
>  
>  	dev->match_driver = true;
>  	retval = device_attach(&dev->dev);
> -	if (retval < 0 && retval != -EPROBE_DEFER) {
> +	if (retval < 0 && retval != -EPROBE_DEFER)
>  		pci_warn(dev, "device attach failed (%d)\n", retval);
> -		pci_proc_detach_device(dev);
> -		pci_remove_sysfs_dev_files(dev);

Thanks for catching my bug!

> -		return;
> -	}
>  
>  	pci_dev_assign_added(dev, true);
>  }
> -- 
> 2.27.0.212.ge8ba1cc988-goog
>