linux-kernel - [PATCH 11/11] sis: do not use PCI resources before pci_enable

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Date:	Tue,  3 Aug 2010 19:44:27 +0400
From:	Kulikov Vasiliy <segooon@...il.com>
To:	kernel-janitors@...r.kernel.org
Cc:	Thomas Winischhofer <thomas@...ischhofer.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Roel Kluin <roel.kluin@...il.com>,
	Dan Carpenter <error27@...il.com>,
	Christoph Egger <siccegge@...d.informatik.uni-erlangen.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 11/11] sis: do not use PCI resources before pci_enable_device()

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>
---
 drivers/video/sis/sis_main.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/drivers/video/sis/sis_main.c b/drivers/video/sis/sis_main.c
index 559bf17..47ba64e 100644
--- a/drivers/video/sis/sis_main.c
+++ b/drivers/video/sis/sis_main.c
@@ -5782,6 +5782,11 @@ sisfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	ivideo->subsysvendor = pdev->subsystem_vendor;
 	ivideo->subsysdevice = pdev->subsystem_device;
 
+	if (!ivideo->sisvga_enabled && pci_enable_device(pdev)) {
+		framebuffer_release(sis_fb_info);
+		return -EIO;
+	}
+
 #ifndef MODULE
 	if(sisfb_mode_idx == -1) {
 		sisfb_get_vga_mode_from_kernel();
@@ -5923,14 +5928,6 @@ sisfb_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	}
 #endif
 
-	if(!ivideo->sisvga_enabled) {
-		if(pci_enable_device(pdev)) {
-			if(ivideo->nbridge) pci_dev_put(ivideo->nbridge);
-			pci_set_drvdata(pdev, NULL);
-			framebuffer_release(sis_fb_info);
-			return -EIO;
-		}
-	}
 
 	ivideo->video_base = pci_resource_start(pdev, 0);
 	ivideo->mmio_base  = pci_resource_start(pdev, 1);
-- 
1.7.0.4

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