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| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2017-01-11 11:50:06 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2017-02-15 20:02:43 +1100 |
| commit | d7d55536c6cd1f80295b6d7483ad0587b148bde4 (patch) | |
| tree | 4e88185103f774ce2f9bcfd11c10e2f9df9dddd9 /drivers/pci | |
| parent | 5b102782c7f460d88b42d504c78755eeb030894a (diff) | |
| download | linux-d7d55536c6cd1f80295b6d7483ad0587b148bde4.tar.gz linux-d7d55536c6cd1f80295b6d7483ad0587b148bde4.tar.bz2 linux-d7d55536c6cd1f80295b6d7483ad0587b148bde4.zip | |
drivers/pci/hotplug: Handle presence detection change properly
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: 360aebd85a4 ("drivers/pci/hotplug: Support surprise hotplug in powernv driver")
Cc: stable@vger.kernel.org #v4.9+
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>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/hotplug/pnv_php.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c index 56efaf72d08e..306728cb5785 100644 --- a/drivers/pci/hotplug/pnv_php.c +++ b/drivers/pci/hotplug/pnv_php.c @@ -707,8 +707,12 @@ static irqreturn_t pnv_php_interrupt(int irq, void *data) added = !!(lsts & PCI_EXP_LNKSTA_DLLLA); } else if (sts & PCI_EXP_SLTSTA_PDC) { ret = pnv_pci_get_presence_state(php_slot->id, &presence); - if (!ret) + if (ret) { + dev_warn(&pdev->dev, "PCI slot [%s] error %d getting presence (0x%04x), to retry the operation.\n", + php_slot->name, ret, sts); return IRQ_HANDLED; + } + added = !!(presence == OPAL_PCI_SLOT_PRESENT); } else { return IRQ_NONE; |