drivers/pci/hotplug: Handle presence detection change properly

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commit d7d55536c6 upstream.

The surprise hotplug is driven by interrupt in PowerNV PCI hotplug
driver. In the interrupt handler, pnv_php_interrupt(), we bail when
pnv_pci_get_presence_state() returns zero wrongly. It causes the
presence change event is always ignored incorrectly.

This fixes the issue by bailing on error (non-zero value) returned
from pnv_pci_get_presence_state().

Fixes: 360aebd85a ("drivers/pci/hotplug: Support surprise hotplug in powernv driver")
Reported-by: Hank Chang <hankmax0000@gmail.com>
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Tested-by: Willie Liauw <williel@supermicro.com.tw>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Gavin Shan 2017-01-11 11:50:06 +11:00 • committed by Greg Kroah-Hartman

parent 17ea11d553

commit 1afe7b4ac3

1 changed files with 5 additions and 1 deletions

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drivers/pci/hotplug/pnv_php.c

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