Re: [PATCH 1/2] pci: Add pci device even if the driver failed to attach - Greg Kroah-Hartman

From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Rajat Jain <rajatja@google.com>
Cc: Todd Broch <tbroch@google.com>,
	linux-pci@vger.kernel.org, lalithambika.krishnakumar@intel.com,
	Diego Rivas <diegorivas@google.com>,
	Jean-Philippe Brucker <jean-philippe@linaro.org>,
	Furquan Shaikh <furquan@google.com>,
	Raj Ashok <ashok.raj@intel.com>,
	linux-acpi@vger.kernel.org,
	Christian Kellner <christian@kellner.me>,
	Mattias Nissler <mnissler@google.com>,
	Jesse Barnes <jsbarnes@google.com>, Len Brown <lenb@kernel.org>,
	Rajat Jain <rajatxjain@gmail.com>,
	Prashant Malani <pmalani@google.com>,
	Aaron Durbin <adurbin@google.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Bernie Keany <bernie.keany@intel.com>,
	Duncan Laurie <dlaurie@google.com>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org,
	oohall@gmail.com, Benson Leung <bleung@google.com>,
	David Woodhouse <dwmw2@infradead.org>,
	Alex Levin <levinale@google.com>
Subject: Re: [PATCH 1/2] pci: Add pci device even if the driver failed to attach
Date: Fri, 26 Jun 2020 16:14:46 +0200	[thread overview]
Message-ID: <20200626141446.GA4141629@kroah.com> (raw)
In-Reply-To: <20200626002710.110200-1-rajatja@google.com>

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.
> 
> This patch partially reverts:
> commit ab1a187bba5c ("PCI: Check device_attach() return value always")
> 
> Signed-off-by: Rajat Jain <rajatja@google.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);
> -		return;
> -	}

Nice catch, sysfs stuff shouldn't be dependant if a driver is bound to a
device or not.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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