linux-kernel - [PATCH] PCI: Fix device class print out

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Date:	Sun, 19 Feb 2012 14:50:12 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH] PCI: Fix device class print out

Found debug print out about class is shifted.

| pci 0000:f8:15.2: [8086:2b56] type 0 class 0x000600

code is trying to print class with 6 digits, but use shifted class with 4 digits
valid value as variable.

Change to original dev->class directly.

also remove not needed calculating of local variable class, because it will be
updated after pci_fixup_device(pci_fixup_early...)

Also unify type print out when class and header is not matched.

Signed-off-by: Yinghai Lu <yinghai@...nel.org>

---
 drivers/pci/probe.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

Index: linux-2.6/drivers/pci/probe.c
===================================================================
--- linux-2.6.orig/drivers/pci/probe.c
+++ linux-2.6/drivers/pci/probe.c
@@ -1125,12 +1125,10 @@ int pci_setup_device(struct pci_dev *dev
 
 	pci_read_config_dword(dev, PCI_CLASS_REVISION, &class);
 	dev->revision = class & 0xff;
-	class >>= 8;				    /* upper 3 bytes */
-	dev->class = class;
-	class >>= 8;
+	dev->class = class >> 8;		    /* upper 3 bytes */
 
-	dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %d class %#08x\n",
-		   dev->vendor, dev->device, dev->hdr_type, class);
+	dev_printk(KERN_DEBUG, &dev->dev, "[%04x:%04x] type %02x class %#08x\n",
+		   dev->vendor, dev->device, dev->hdr_type, dev->class);
 
 	/* need to have dev->class ready */
 	dev->cfg_size = pci_cfg_space_size(dev);
@@ -1212,8 +1210,8 @@ int pci_setup_device(struct pci_dev *dev
 		return -EIO;
 
 	bad:
-		dev_err(&dev->dev, "ignoring class %02x (doesn't match header "
-			"type %02x)\n", class, dev->hdr_type);
+		dev_err(&dev->dev, "ignoring class %#08x (doesn't match header "
+			"type %02x)\n", dev->class, dev->hdr_type);
 		dev->class = PCI_CLASS_NOT_DEFINED;
 	}
 
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