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From:   Sasha Levin <sashal@kernel.org>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc:     Frederic Barrat <fbarrat@linux.ibm.com>,
        Alastair D'Silva <alastair@d-silva.org>,
        Andrew Donnellan <ajd@linux.ibm.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Sasha Levin <sashal@kernel.org>, linuxppc-dev@lists.ozlabs.org,
        linux-pci@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 70/78] pci/hotplug/pnv-php: Remove erroneous warning
Date:   Sat, 18 Apr 2020 10:40:39 -0400
Message-Id: <20200418144047.9013-70-sashal@kernel.org>
In-Reply-To: <20200418144047.9013-1-sashal@kernel.org>
References: <20200418144047.9013-1-sashal@kernel.org>
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From: Frederic Barrat <fbarrat@linux.ibm.com>

[ Upstream commit 658ab186dd22060408d94f5c5a6d02d809baba44 ]

On powernv, when removing a device through hotplug, the following
warning is logged:

     Invalid refcount <.> on <...>

It may be incorrect, the refcount may be set to a higher value than 1
and be valid. of_detach_node() can drop more than one reference. As it
doesn't seem trivial to assert the correct value, let's remove the
warning.

Reviewed-by: Alastair D'Silva <alastair@d-silva.org>
Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20191121134918.7155-7-fbarrat@linux.ibm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/hotplug/pnv_php.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index d7b2b47bc33eb..6037983c6e46b 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -151,17 +151,11 @@ static void pnv_php_rmv_pdns(struct device_node *dn)
 static void pnv_php_detach_device_nodes(struct device_node *parent)
 {
 	struct device_node *dn;
-	int refcount;
 
 	for_each_child_of_node(parent, dn) {
 		pnv_php_detach_device_nodes(dn);
 
 		of_node_put(dn);
-		refcount = kref_read(&dn->kobj.kref);
-		if (refcount != 1)
-			pr_warn("Invalid refcount %d on <%pOF>\n",
-				refcount, dn);
-
 		of_detach_node(dn);
 	}
 }
-- 
2.20.1