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1f4cd884c1
commit 1c2cb594441d02815d304cccec9742ff5c707495 upstream.
The EPOW interrupt handler uses rtas_get_sensor(), which in turn
uses rtas_busy_delay() to wait for RTAS becoming ready in case it
is necessary. But rtas_busy_delay() is annotated with might_sleep()
and thus may not be used by interrupts handlers like the EPOW handler!
This leads to the following BUG when CONFIG_DEBUG_ATOMIC_SLEEP is
enabled:
BUG: sleeping function called from invalid context at arch/powerpc/kernel/rtas.c:496
in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/1
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.2.0-rc2-thuth #6
Call Trace:
[c00000007ffe7b90] [c000000000807670] dump_stack+0xa0/0xdc (unreliable)
[c00000007ffe7bc0] [c0000000000e1f14] ___might_sleep+0x134/0x180
[c00000007ffe7c20] [c00000000002aec0] rtas_busy_delay+0x30/0xd0
[c00000007ffe7c50] [c00000000002bde4] rtas_get_sensor+0x74/0xe0
[c00000007ffe7ce0] [c000000000083264] ras_epow_interrupt+0x44/0x450
[c00000007ffe7d90] [c000000000120260] handle_irq_event_percpu+0xa0/0x300
[c00000007ffe7e70] [c000000000120524] handle_irq_event+0x64/0xc0
[c00000007ffe7eb0] [c000000000124dbc] handle_fasteoi_irq+0xec/0x260
[c00000007ffe7ef0] [c00000000011f4f0] generic_handle_irq+0x50/0x80
[c00000007ffe7f20] [c000000000010f3c] __do_irq+0x8c/0x200
[c00000007ffe7f90] [c0000000000236cc] call_do_irq+0x14/0x24
[c00000007e6f39e0] [c000000000011144] do_IRQ+0x94/0x110
[c00000007e6f3a30] [c000000000002594] hardware_interrupt_common+0x114/0x180
Fix this issue by introducing a new rtas_get_sensor_fast() function
that does not use rtas_busy_delay() - and thus can only be used for
sensors that do not cause a BUSY condition - known as "fast" sensors.
The EPOW sensor is defined to be "fast" in sPAPR - mpe.
Fixes:
|
||
|---|---|---|
| .. | ||
| 8xx_immap.h | ||
| abs_addr.h | ||
| agp.h | ||
| asm-compat.h | ||
| asm-offsets.h | ||
| async_tx.h | ||
| atomic.h | ||
| auxvec.h | ||
| backlight.h | ||
| barrier.h | ||
| bitops.h | ||
| bitsperlong.h | ||
| bootx.h | ||
| btext.h | ||
| bug.h | ||
| bugs.h | ||
| byteorder.h | ||
| cache.h | ||
| cacheflush.h | ||
| cell-pmu.h | ||
| cell-regs.h | ||
| checksum.h | ||
| clk_interface.h | ||
| cmpxchg.h | ||
| code-patching.h | ||
| compat.h | ||
| cpm.h | ||
| cpm1.h | ||
| cpm2.h | ||
| cputable.h | ||
| cputhreads.h | ||
| cputime.h | ||
| current.h | ||
| dbdma.h | ||
| dbell.h | ||
| dcr-generic.h | ||
| dcr-mmio.h | ||
| dcr-native.h | ||
| dcr-regs.h | ||
| dcr.h | ||
| debug.h | ||
| delay.h | ||
| device.h | ||
| disassemble.h | ||
| div64.h | ||
| dma-mapping.h | ||
| dma.h | ||
| edac.h | ||
| eeh.h | ||
| eeh_event.h | ||
| ehv_pic.h | ||
| elf.h | ||
| emergency-restart.h | ||
| emulated_ops.h | ||
| epapr_hcalls.h | ||
| errno.h | ||
| exception-64e.h | ||
| exception-64s.h | ||
| exec.h | ||
| fadump.h | ||
| fb.h | ||
| fcntl.h | ||
| feature-fixups.h | ||
| firmware.h | ||
| fixmap.h | ||
| floppy.h | ||
| fs_pd.h | ||
| fsl_85xx_cache_sram.h | ||
| fsl_gtm.h | ||
| fsl_guts.h | ||
| fsl_hcalls.h | ||
| fsl_ifc.h | ||
| fsl_lbc.h | ||
| ftrace.h | ||
| futex.h | ||
| gpio.h | ||
| grackle.h | ||
| hardirq.h | ||
| heathrow.h | ||
| highmem.h | ||
| hugetlb.h | ||
| hvcall.h | ||
| hvconsole.h | ||
| hvcserver.h | ||
| hvsi.h | ||
| hw_breakpoint.h | ||
| hw_irq.h | ||
| hydra.h | ||
| i8259.h | ||
| ibmebus.h | ||
| ide.h | ||
| immap_cpm2.h | ||
| immap_qe.h | ||
| io-defs.h | ||
| io-workarounds.h | ||
| io.h | ||
| io_event_irq.h | ||
| ioctl.h | ||
| ioctls.h | ||
| iommu.h | ||
| ipcbuf.h | ||
| ipic.h | ||
| irq.h | ||
| irq_regs.h | ||
| irqflags.h | ||
| jump_label.h | ||
| Kbuild | ||
| kdebug.h | ||
| kdump.h | ||
| kexec.h | ||
| keylargo.h | ||
| kgdb.h | ||
| kmap_types.h | ||
| kprobes.h | ||
| kvm.h | ||
| kvm_44x.h | ||
| kvm_asm.h | ||
| kvm_book3s.h | ||
| kvm_book3s_32.h | ||
| kvm_book3s_64.h | ||
| kvm_book3s_asm.h | ||
| kvm_booke.h | ||
| kvm_e500.h | ||
| kvm_fpu.h | ||
| kvm_host.h | ||
| kvm_para.h | ||
| kvm_ppc.h | ||
| libata-portmap.h | ||
| linkage.h | ||
| local.h | ||
| local64.h | ||
| lppaca.h | ||
| lv1call.h | ||
| machdep.h | ||
| macio.h | ||
| mc146818rtc.h | ||
| mediabay.h | ||
| mman.h | ||
| mmu-8xx.h | ||
| mmu-40x.h | ||
| mmu-44x.h | ||
| mmu-book3e.h | ||
| mmu-hash32.h | ||
| mmu-hash64.h | ||
| mmu.h | ||
| mmu_context.h | ||
| mmzone.h | ||
| module.h | ||
| mpc5xxx.h | ||
| mpc6xx.h | ||
| mpc8xx.h | ||
| mpc52xx.h | ||
| mpc52xx_psc.h | ||
| mpc5121.h | ||
| mpc8260.h | ||
| mpic.h | ||
| mpic_msgr.h | ||
| msgbuf.h | ||
| msi_bitmap.h | ||
| mutex.h | ||
| nvram.h | ||
| ohare.h | ||
| opal.h | ||
| oprofile_impl.h | ||
| paca.h | ||
| page.h | ||
| page_32.h | ||
| page_64.h | ||
| param.h | ||
| parport.h | ||
| pasemi_dma.h | ||
| pci-bridge.h | ||
| pci.h | ||
| percpu.h | ||
| perf_event.h | ||
| perf_event_fsl_emb.h | ||
| perf_event_server.h | ||
| pgalloc-32.h | ||
| pgalloc-64.h | ||
| pgalloc.h | ||
| pgtable-ppc32.h | ||
| pgtable-ppc64-4k.h | ||
| pgtable-ppc64-64k.h | ||
| pgtable-ppc64.h | ||
| pgtable.h | ||
| pmac_feature.h | ||
| pmac_low_i2c.h | ||
| pmac_pfunc.h | ||
| pmc.h | ||
| pmi.h | ||
| poll.h | ||
| posix_types.h | ||
| ppc-opcode.h | ||
| ppc-pci.h | ||
| ppc4xx.h | ||
| ppc_asm.h | ||
| processor.h | ||
| prom.h | ||
| ps3.h | ||
| ps3av.h | ||
| ps3fb.h | ||
| ps3gpu.h | ||
| ps3stor.h | ||
| pSeries_reconfig.h | ||
| pte-8xx.h | ||
| pte-40x.h | ||
| pte-44x.h | ||
| pte-book3e.h | ||
| pte-common.h | ||
| pte-fsl-booke.h | ||
| pte-hash32.h | ||
| pte-hash64-4k.h | ||
| pte-hash64-64k.h | ||
| pte-hash64.h | ||
| ptrace.h | ||
| qe.h | ||
| qe_ic.h | ||
| reg.h | ||
| reg_8xx.h | ||
| reg_a2.h | ||
| reg_booke.h | ||
| reg_fsl_emb.h | ||
| resource.h | ||
| rheap.h | ||
| rio.h | ||
| rtas.h | ||
| rtc.h | ||
| runlatch.h | ||
| scatterlist.h | ||
| scom.h | ||
| seccomp.h | ||
| sections.h | ||
| sembuf.h | ||
| serial.h | ||
| setjmp.h | ||
| setup.h | ||
| sfp-machine.h | ||
| shmbuf.h | ||
| shmparam.h | ||
| sigcontext.h | ||
| siginfo.h | ||
| signal.h | ||
| smp.h | ||
| smu.h | ||
| socket.h | ||
| sockios.h | ||
| sparsemem.h | ||
| spinlock.h | ||
| spinlock_types.h | ||
| spu.h | ||
| spu_csa.h | ||
| spu_info.h | ||
| spu_priv1.h | ||
| sstep.h | ||
| stat.h | ||
| statfs.h | ||
| string.h | ||
| swab.h | ||
| swiotlb.h | ||
| switch_to.h | ||
| synch.h | ||
| syscall.h | ||
| syscalls.h | ||
| systbl.h | ||
| tce.h | ||
| termbits.h | ||
| termios.h | ||
| thread_info.h | ||
| time.h | ||
| timex.h | ||
| tlb.h | ||
| tlbflush.h | ||
| topology.h | ||
| trace.h | ||
| tsi108.h | ||
| tsi108_irq.h | ||
| tsi108_pci.h | ||
| types.h | ||
| uaccess.h | ||
| ucc.h | ||
| ucc_fast.h | ||
| ucc_slow.h | ||
| ucontext.h | ||
| udbg.h | ||
| uic.h | ||
| unaligned.h | ||
| uninorth.h | ||
| unistd.h | ||
| user.h | ||
| vdso.h | ||
| vdso_datapage.h | ||
| vga.h | ||
| vio.h | ||
| wsp.h | ||
| xics.h | ||
| xilinx_intc.h | ||
| xilinx_pci.h | ||
| xmon.h | ||
| xor.h | ||