This is a note to let you know that I've just added the patch titled
drivers/pci/hotplug: Handle presence detection change properly
to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drivers-pci-hotplug-handle-presence-detection-change-properly.patch
and it can be found in the queue-4.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d7d55536c6cd1f80295b6d7483ad0587b148bde4 Mon Sep 17 00:00:00 2001
From: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Date: Wed, 11 Jan 2017 11:50:06 +1100
Subject: drivers/pci/hotplug: Handle presence detection change properly
From: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
commit d7d55536c6cd1f80295b6d7483ad0587b148bde4 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: 360aebd85a4 ("drivers/pci/hotplug: Support surprise hotplug in powernv driver")
Reported-by: Hank Chang <hankmax0000@xxxxxxxxx>
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Tested-by: Willie Liauw <williel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/hotplug/pnv_php.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -713,8 +713,12 @@ static irqreturn_t pnv_php_interrupt(int
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;
Patches currently in stable-queue which might be from gwshan@xxxxxxxxxxxxxxxxxx are
queue-4.10/pci-hotplug-pnv-php-remove-warn_on-in-pnv_php_put_slot.patch
queue-4.10/pci-hotplug-pnv-php-disable-surprise-hotplug-capability-on-conflicts.patch
queue-4.10/drivers-pci-hotplug-handle-presence-detection-change-properly.patch
queue-4.10/drivers-pci-hotplug-fix-initial-state-for-empty-slot.patch