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05ba75f848
linux/arch/powerpc
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Gavin Shan 05ba75f848 powerpc/eeh: Fix stale cached primary bus 
When PE is created, its primary bus is cached to pe->bus. At later
point, the cached primary bus is returned from eeh_pe_bus_get().
However, we could get stale cached primary bus and run into kernel
crash in one case: full hotplug as part of fenced PHB error recovery
releases all PCI busses under the PHB at unplugging time and recreate
them at plugging time. pe->bus is still dereferencing the PCI bus
that was released.

This adds another PE flag (EEH_PE_PRI_BUS) to represent the validity
of pe->bus. pe->bus is updated when its first child EEH device is
online and the flag is set. Before unplugging in full hotplug for
error recovery, the flag is cleared.

Fixes: 8cdb2833 ("powerpc/eeh: Trace PCI bus from PE")
Cc: stable@vger.kernel.org #v3.11+
Reported-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Reported-by: Pradipta Ghosh <pradghos@in.ibm.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Tested-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2016-02-15 21:10:04 +11:00
..
boot powerpc updates for 4.5 2016-01-15 13:18:47 -08:00
configs powerpc/85xx: Enable TWR_P102x in mpc85xx_basic_defconfig 2015-12-22 18:23:21 -06:00
crypto powerpc: Create disable_kernel_{fp,altivec,vsx,spe}() 2015-12-01 13:52:25 +11:00
include powerpc/eeh: Fix stale cached primary bus 2016-02-15 21:10:04 +11:00
kernel powerpc/eeh: Fix stale cached primary bus 2016-02-15 21:10:04 +11:00
kvm kvm: rename pfn_t to kvm_pfn_t 2016-01-15 17:56:32 -08:00
lib powerpc: Create disable_kernel_{fp,altivec,vsx,spe}() 2015-12-01 13:52:25 +11:00
math-emu
mm powerpc/mm: Allow user space to map rtas_rmo_buf 2016-01-25 16:31:13 +11:00
net net: filter: make JITs zero A for SKF_AD_ALU_XOR_X 2016-01-06 00:43:52 -05:00
oprofile powerpc: Remove mtmsrd(), use existing mtmsr() 2015-07-13 15:47:28 +10:00
perf powerpc/perf: Remove PPMU_HAS_SSLOT flag for Power8 2016-01-28 23:48:35 +11:00
platforms powerpc/eeh: Fix stale cached primary bus 2016-02-15 21:10:04 +11:00
sysdev mm, dax, pmem: introduce pfn_t 2016-01-15 17:56:32 -08:00
xmon powerpc/xmon: Use rtas_call_unlocked() in xmon 2015-12-17 22:40:55 +11:00
Kconfig powerpc/book3s_32: Fix build error with checkpoint restart 2016-01-31 15:08:06 +11:00
Kconfig.debug powerpc updates for 4.5 2016-01-15 13:18:47 -08:00
Makefile powerpc/cell: Drop CONFIG_TUNE_CELL in favour of CONFIG_CELL_CPU 2015-10-19 19:51:18 +11:00
relocs_check.sh