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9e5c6e5a3b
pci_get_slot() is called with hold of PCI bus semaphore and it's not safe to be called in interrupt context. However, we possibly checks EEH error and calls the function in interrupt context. To avoid using pci_get_slot(), we turn into device tree for fetching location code. Otherwise, we might run into WARN_ON() as following messages indicate: WARNING: at drivers/pci/search.c:223 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.16.0-rc3+ #72 task: c000000001367af0 ti: c000000001444000 task.ti: c000000001444000 NIP: c000000000497b70 LR: c000000000037530 CTR: 000000003003d114 REGS: c000000001446fa0 TRAP: 0700 Not tainted (3.16.0-rc3+) MSR: 9000000000029032 <SF,HV,EE,ME,IR,DR,RI> CR: 48002422 XER: 20000000 CFAR: c00000000003752c SOFTE: 0 : NIP [c000000000497b70] .pci_get_slot+0x40/0x110 LR [c000000000037530] .eeh_pe_loc_get+0x150/0x190 Call Trace: .of_get_property+0x30/0x60 (unreliable) .eeh_pe_loc_get+0x150/0x190 .eeh_dev_check_failure+0x1b4/0x550 .eeh_check_failure+0x90/0xf0 .lpfc_sli_check_eratt+0x504/0x7c0 [lpfc] .lpfc_poll_eratt+0x64/0x100 [lpfc] .call_timer_fn+0x64/0x190 .run_timer_softirq+0x2cc/0x3e0 Cc: stable@vger.kernel.org Signed-off-by: Mike Qiu <qiudayu@linux.vnet.ibm.com> Acked-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> |
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