• Breno Leitao's avatar
    powerpc/eeh: Fix a bug when pci structure is null · 8d3d50bf
    Breno Leitao authored
    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: default avatarBreno Leitao <leitao@linux.vnet.ibm.com>
    Signed-off-by: default avatarLinas Vepstas <linasvepstas@gmail.com>
    Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
    8d3d50bf
ppc-pci.h 4.64 KB