linux-kernel - [PATCH 05/31] uio: do not use PCI resources before pci_enable

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Date:	Fri, 22 Oct 2010 11:24:50 -0700
From:	Greg Kroah-Hartman <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org
Cc:	Kulikov Vasiliy <segooon@...il.com>,
	"Hans J. Koch" <hjk@...utronix.de>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [PATCH 05/31] uio: do not use PCI resources before pci_enable_device()

From: Kulikov Vasiliy <segooon@...il.com>

IRQ and resource[] may not have correct values until
after PCI hotplug setup occurs at pci_enable_device() time.

The semantic match that finds this problem is as follows:

// <smpl>
@@
identifier x;
identifier request ~= "pci_request.*|pci_resource.*";
@@

(
* x->irq
|
* x->resource
|
* request(x, ...)
)
 ...
*pci_enable_device(x)
// </smpl>

Signed-off-by: Kulikov Vasiliy <segooon@...il.com>
Acked-by: Michael S. Tsirkin <mst@...hat.com>
Signed-off-by: Hans J. Koch <hjk@...utronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>
---
 drivers/uio/uio_pci_generic.c |   13 +++++++------
 1 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/uio/uio_pci_generic.c b/drivers/uio/uio_pci_generic.c
index 85c9884..fc22e1e 100644
--- a/drivers/uio/uio_pci_generic.c
+++ b/drivers/uio/uio_pci_generic.c
@@ -128,12 +128,6 @@ static int __devinit probe(struct pci_dev *pdev,
 	struct uio_pci_generic_dev *gdev;
 	int err;
 
-	if (!pdev->irq) {
-		dev_warn(&pdev->dev, "No IRQ assigned to device: "
-			 "no support for interrupts?\n");
-		return -ENODEV;
-	}
-
 	err = pci_enable_device(pdev);
 	if (err) {
 		dev_err(&pdev->dev, "%s: pci_enable_device failed: %d\n",
@@ -141,6 +135,13 @@ static int __devinit probe(struct pci_dev *pdev,
 		return err;
 	}
 
+	if (!pdev->irq) {
+		dev_warn(&pdev->dev, "No IRQ assigned to device: "
+			 "no support for interrupts?\n");
+		pci_disable_device(pdev);
+		return -ENODEV;
+	}
+
 	err = verify_pci_2_3(pdev);
 	if (err)
 		goto err_verify;
-- 
1.7.2

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