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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Rajat Jain <rajatja@google.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Subject: [PATCH 4.9 04/42] PCI: Add device even if driver attach failed
Date:   Tue,  1 Dec 2020 09:53:02 +0100
Message-Id: <20201201084642.384498201@linuxfoundation.org>
In-Reply-To: <20201201084642.194933793@linuxfoundation.org>
References: <20201201084642.194933793@linuxfoundation.org>
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From: Rajat Jain <rajatja@google.com>

commit 2194bc7c39610be7cabe7456c5f63a570604f015 upstream.

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.

When device_attach() fails, merely warn about it and keep the PCI device in
the system.

This partially reverts ab1a187bba5c ("PCI: Check device_attach() return
value always").

Link: https://lore.kernel.org/r/20200706233240.3245512-1-rajatja@google.com
Signed-off-by: Rajat Jain <rajatja@google.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable@vger.kernel.org	# v4.6+
[sudip: use dev_warn]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/pci/bus.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -324,12 +324,8 @@ void pci_bus_add_device(struct pci_dev *
 
 	dev->match_driver = true;
 	retval = device_attach(&dev->dev);
-	if (retval < 0 && retval != -EPROBE_DEFER) {
+	if (retval < 0 && retval != -EPROBE_DEFER)
 		dev_warn(&dev->dev, "device attach failed (%d)\n", retval);
-		pci_proc_detach_device(dev);
-		pci_remove_sysfs_dev_files(dev);
-		return;
-	}
 
 	dev->is_added = 1;
 }