[PATCH 4.19 05/92] PCI: Add device even if driver attach failed

[Greg Kroah-Hartman]

From: Rajat Jain <raja...@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-raja...@google.com
Signed-off-by: Rajat Jain <raja...@google.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
Reviewed-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
Cc: sta...@vger.kernel.org      # v4.6+
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 drivers/pci/bus.c |    6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -323,12 +323,8 @@ 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)
                pci_warn(dev, "device attach failed (%d)\n", retval);
-               pci_proc_detach_device(dev);
-               pci_remove_sysfs_dev_files(dev);
-               return;
-       }
 
        pci_dev_assign_added(dev, true);
 }