linux-kernel - [PATCH 4.9 32/63] drivers/pci/hotplug: Handle presence detection change properly

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Date:   Mon, 13 Mar 2017 16:39:19 +0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hank Chang <hankmax0000@...il.com>,
        Gavin Shan <gwshan@...ux.vnet.ibm.com>,
        Willie Liauw <williel@...ermicro.com.tw>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: [PATCH 4.9 32/63] drivers/pci/hotplug: Handle presence detection change properly

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gavin Shan <gwshan@...ux.vnet.ibm.com>

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@...il.com>
Signed-off-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>
Tested-by: Willie Liauw <williel@...ermicro.com.tw>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 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;