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powerpc/pseries/eeh: Fix crash when error happens during device probe 

EEH may happen during a PCI driver probe. If the driver is trying to
access some register in a loop, the EEH code will try to print the
driver name. But the driver pointer in struct pci_dev is not set until
probe returns successfully.

Use a function to test if the device and the driver pointer is NULL
before accessing the driver's name.

Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Thadeu Lima de Souza Cascardo 2012-01-11 09:09:58 +00:00 committed by Benjamin Herrenschmidt
parent 444080d13d
commit 778a785f02
2 changed files with 7 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/include/asm/ppc-pci.h
View File

@ -142,6 +142,11 @@ static inline const char *eeh_pci_name(struct pci_dev *pdev)
return pdev ? pci_name(pdev) : "<null>";
}
static inline const char *eeh_driver_name(struct pci_dev *pdev)
{
return (pdev && pdev->driver) ? pdev->driver->name : "<null>";
}
#endif /* CONFIG_EEH */
#else /* CONFIG_PCI */

4
arch/powerpc/platforms/pseries/eeh.c
View File

@ -551,9 +551,9 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
printk (KERN_ERR "EEH: %d reads ignored for recovering device at "
"location=%s driver=%s pci addr=%s\n",
pdn->eeh_check_count, location,
dev->driver->name, eeh_pci_name(dev));
eeh_driver_name(dev), eeh_pci_name(dev));
printk (KERN_ERR "EEH: Might be infinite loop in %s driver\n",
dev->driver->name);
eeh_driver_name(dev));
dump_stack();
}
goto dn_unlock;