linux-kernel - [PATCH v2] xen/pciback: support driver

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Message-Id: <1472819456-12995-1-git-send-email-jgross@suse.com>
Date:   Fri,  2 Sep 2016 14:30:56 +0200
From:   Juergen Gross <jgross@...e.com>
To:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org
Cc:     boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
        Juergen Gross <jgross@...e.com>
Subject: [PATCH v2] xen/pciback: support driver_override

Support the driver_override scheme introduced with commit 782a985d7af2
("PCI: Introduce new device binding path using pci_dev.driver_override")

As pcistub_probe() is called for all devices (it has to check for a
match based on the slot address rather than device type) it has to
check for driver_override set to "pciback" itself.

Signed-off-by: Juergen Gross <jgross@...e.com>
---
V2: removed now unused label
---
 drivers/xen/xen-pciback/pci_stub.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/xen-pciback/pci_stub.c b/drivers/xen/xen-pciback/pci_stub.c
index 258b7c3..85c28f7 100644
--- a/drivers/xen/xen-pciback/pci_stub.c
+++ b/drivers/xen/xen-pciback/pci_stub.c
@@ -25,6 +25,8 @@
 #include "conf_space.h"
 #include "conf_space_quirks.h"
 
+#define PCISTUB_DRIVER_NAME "pciback"
+
 static char *pci_devs_to_hide;
 wait_queue_head_t xen_pcibk_aer_wait_queue;
 /*Add sem for sync AER handling and xen_pcibk remove/reconfigue ops,
@@ -529,16 +531,18 @@ static int pcistub_probe(struct pci_dev *dev, const struct pci_device_id *id)
 				"don't have a normal (0) or bridge (1) "
 				"header type!\n");
 			err = -ENODEV;
-			goto out;
 		}
 
+	} else if (!dev->driver_override ||
+		   strcmp(dev->driver_override, PCISTUB_DRIVER_NAME))
+		/* Didn't find the device */
+		err = -ENODEV;
+
+	if (!err) {
 		dev_info(&dev->dev, "seizing device\n");
 		err = pcistub_seize(dev);
-	} else
-		/* Didn't find the device */
-		err = -ENODEV;
+	}
 
-out:
 	return err;
 }
 
@@ -945,7 +949,7 @@ static const struct pci_error_handlers xen_pcibk_error_handler = {
 static struct pci_driver xen_pcibk_pci_driver = {
 	/* The name should be xen_pciback, but until the tools are updated
 	 * we will keep it as pciback. */
-	.name = "pciback",
+	.name = PCISTUB_DRIVER_NAME,
 	.id_table = pcistub_ids,
 	.probe = pcistub_probe,
 	.remove = pcistub_remove,
-- 
2.6.6