diff options
| author | Thadeu Lima de Souza Cascardo <cascardo@linux.vnet.ibm.com> | 2012-01-11 13:09:58 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2012-02-14 08:01:39 +0400 |
| commit | 778a785f02ad846446e91dab49331bd7d853c514 (patch) | |
| tree | 4f8969fe08df41ced83f44ec9dd459ab10e72d69 | |
| parent | 444080d13d05dc38d07dd3bf751d38bce7ab7c72 (diff) | |
| download | linux-778a785f02ad846446e91dab49331bd7d853c514.tar.xz | |
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>
| -rw-r--r-- | arch/powerpc/include/asm/ppc-pci.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh.c | 4 |
2 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/include/asm/ppc-pci.h b/arch/powerpc/include/asm/ppc-pci.h index 43268f15004e..6d422979ebaf 100644 --- a/arch/powerpc/include/asm/ppc-pci.h +++ b/arch/powerpc/include/asm/ppc-pci.h @@ -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 */ diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c index 565869022e3d..c0b40af4ce4f 100644 --- a/arch/powerpc/platforms/pseries/eeh.c +++ b/arch/powerpc/platforms/pseries/eeh.c @@ -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; |