powerpc/eeh: Fix stale cached primary bus

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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>

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This commit is contained in:

Gavin Shan 2016-02-09 15:50:21 +11:00 • committed by Michael Ellerman

parent 126df08c52

commit 05ba75f848

4 changed files with 9 additions and 2 deletions

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1

arch/powerpc/include/asm/eeh.h

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3

arch/powerpc/kernel/eeh_driver.c

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2

arch/powerpc/kernel/eeh_pe.c

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5

arch/powerpc/platforms/powernv/eeh-powernv.c

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