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| author |   Breno Leitao <leitao@linux.vnet.ibm.com> | 2010-02-03 05:56:41 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-02-17 14:02:47 +1100 |
| commit | 8d3d50bf1913561ef3b1f5b53115c5a481ba9b1e (patch) | |
| tree | 31da78f8750942c4ec16de24d63e9834b348fcbf /arch/powerpc/platforms/pseries/eeh_driver.c | |
| parent | powerpc: Add coherent_dma_mask to mv64x60 devices (diff) | |
| download | linux-dev-8d3d50bf1913561ef3b1f5b53115c5a481ba9b1e.tar.xz linux-dev-8d3d50bf1913561ef3b1f5b53115c5a481ba9b1e.zip | |
powerpc/eeh: Fix a bug when pci structure is null
During a EEH recover, the pci_dev structure can be null, mainly if an
eeh event is detected during cpi config operation. In this case, the
pci_dev will not be known (and will be null) the kernel will crash
with the following message:
Unable to handle kernel paging request for data at address 0x000000a0
Faulting instruction address: 0xc00000000006b8b4
Oops: Kernel access of bad area, sig: 11 [#1]
NIP [c00000000006b8b4] .eeh_event_handler+0x10c/0x1a0
LR [c00000000006b8a8] .eeh_event_handler+0x100/0x1a0
Call Trace:
[c0000003a80dff00] [c00000000006b8a8] .eeh_event_handler+0x100/0x1a0
[c0000003a80dff90] [c000000000031f1c] .kernel_thread+0x54/0x70
The bug occurs because pci_name() tries to access a null pointer.
This patch just guarantee that pci_name() is not called on Null pointers.
Signed-off-by: Breno Leitao <leitao@linux.vnet.ibm.com>
Signed-off-by: Linas Vepstas <linasvepstas@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_driver.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c index 0c252c3a5f9f..b8d70f5d9aa9 100644 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ b/arch/powerpc/platforms/pseries/eeh_driver.c @@ -337,7 +337,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) location = location ? location : "unknown"; printk(KERN_ERR "EEH: Error: Cannot find partition endpoint " "for location=%s pci addr=%s\n", - location, pci_name(event->dev)); + location, eeh_pci_name(event->dev)); return NULL; } @@ -368,7 +368,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) pci_str = pci_name (frozen_pdn->pcidev); drv_str = pcid_name (frozen_pdn->pcidev); } else { - pci_str = pci_name (event->dev); + pci_str = eeh_pci_name(event->dev); drv_str = pcid_name (event->dev); } |