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tg3: Fix 5761 PXEboot crash

PATCH Applied Matt Carlson 2 participants 2 messages Nov 10, 2007 – Nov 13, 2007

Subsystems (2)
Networking Network drivers
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Matt Carlson

author
#0 lore raw

PATCH 1/13 tg3: Fix 5761 PXEboot crash

When 5761 devices boot the machine using PXEboot, PXE leaves the device active when it terminates. The tg3 driver has code to detect this condition and resets the device during initialization. On 5761 devices, device resets involve sending a driver state update message to the APE on the 5761. However, during this initialization stage, communications to the APE registers have not yet been set up. The driver then dereferences a NULL pointer and crashes the machine. The fix is to move the APE register access setup earlier in the initialization code to cover this condition.

Signed-off-by Matt Carlson <[email protected]>
Signed-off-by Michael Chan <[email protected]>
drivers/net/tg3.c +23 -23
index cad5199..ddeaa0c 100644
@@ -12464,6 +12464,28 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 		goto err_out_iounmap;
 	}
 
+	if (tp->tg3_flags3 & TG3_FLG3_ENABLE_APE) {
+		if (!(pci_resource_flags(pdev, 2) & IORESOURCE_MEM)) {
+			printk(KERN_ERR PFX "Cannot find proper PCI device "
+			       "base address for APE, aborting.\n");
+			err = -ENODEV;
+			goto err_out_iounmap;
+		}
+
+		tg3reg_base = pci_resource_start(pdev, 2);
+		tg3reg_len = pci_resource_len(pdev, 2);
+
+		tp->aperegs = ioremap_nocache(tg3reg_base, tg3reg_len);
+		if (tp->aperegs == 0UL) {
+			printk(KERN_ERR PFX "Cannot map APE registers, "
+			       "aborting.\n");
+			err = -ENOMEM;
+			goto err_out_iounmap;
+		}
+
+		tg3_ape_lock_init(tp);
+	}
+
 	/*
 	 * Reset chip in case UNDI or EFI driver did not shutdown
 	 * DMA self test will enable WDMAC and we'll see (spurious)

@@ -12478,7 +12500,7 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 	err = tg3_test_dma(tp);
 	if (err) {
 		printk(KERN_ERR PFX "DMA engine test failed, aborting.\n");
-		goto err_out_iounmap;
+		goto err_out_apeunmap;
 	}
 
 	/* Tigon3 can do ipv4 only... and some chips have buggy

@@ -12501,28 +12523,6 @@ static int __devinit tg3_init_one(struct pci_dev *pdev,
 
 	tg3_init_coal(tp);
 
-	if (tp->tg3_flags3 & TG3_FLG3_ENABLE_APE) {
-		if (!(pci_resource_flags(pdev, 2) & IORESOURCE_MEM)) {
-			printk(KERN_ERR PFX "Cannot find proper PCI device "
-			       "base address for APE, aborting.\n");
-			err = -ENODEV;
-			goto err_out_iounmap;
-		}
-
-		tg3reg_base = pci_resource_start(pdev, 2);
-		tg3reg_len = pci_resource_len(pdev, 2);
-
-		tp->aperegs = ioremap_nocache(tg3reg_base, tg3reg_len);
-		if (tp->aperegs == 0UL) {
-			printk(KERN_ERR PFX "Cannot map APE registers, "
-			       "aborting.\n");
-			err = -ENOMEM;
-			goto err_out_iounmap;
-		}
-
-		tg3_ape_lock_init(tp);
-	}
-
 	pci_set_drvdata(pdev, dev);
 
 	err = register_netdev(dev);
maintainer
#1 lore raw

From: "Matt Carlson" <[email protected]>
Date: Fri, 09 Nov 2007 16:38:37 -0800

Quoted 10 lines

When 5761 devices boot the machine using PXEboot, PXE leaves the device active when it terminates. The tg3 driver has code to detect this condition and resets the device during initialization. On 5761 devices, device resets involve sending a driver state update message to the APE on the 5761. However, during this initialization stage, communications to the APE registers have not yet been set up. The driver then dereferences a NULL pointer and crashes the machine. The fix is to move the APE register access setup earlier in the initialization code to cover this condition.

Quoted 2 lines
Signed-off-by Matt Carlson <[email protected]>
Signed-off-by Michael Chan <[email protected]>

Patch applied.