linux-kernel - [PATCH 3.19.y-ckt 64/66] net: ethernet: davinci_emac: Fix Unbalanced pm_runtime

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Message-Id: <1461702297-7792-65-git-send-email-kamal@canonical.com>
Date:	Tue, 26 Apr 2016 13:24:55 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Brian Hutchinson <b.hutchman@...il.com>,
	Neil Armstrong <narmstrong@...libre.com>,
	"David S . Miller" <davem@...emloft.net>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 64/66] net: ethernet: davinci_emac: Fix Unbalanced pm_runtime_enable

3.19.8-ckt20 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Neil Armstrong <narmstrong@...libre.com>

commit 99164f9e62a391b5f4b7923b624d182b5d2859e0 upstream.

In order to avoid an Unbalanced pm_runtime_enable in the DaVinci
emac driver when the device is removed and re-probed, and a
pm_runtime_disable() call in davinci_emac_remove().

Actually, using unbind/bind on a TI DM8168 SoC gives :
$ echo 4a120000.ethernet > /sys/bus/platform/drivers/davinci_emac/unbind
net eth1: DaVinci EMAC: davinci_emac_remove()
$ echo 4a120000.ethernet > /sys/bus/platform/drivers/davinci_emac/bind
davinci_emac 4a120000.ethernet: Unbalanced pm_runtime_enable

Cc: Brian Hutchinson <b.hutchman@...il.com>
Fixes: 3ba97381343b ("net: ethernet: davinci_emac: add pm_runtime support")
Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/net/ethernet/ti/davinci_emac.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/ti/davinci_emac.c b/drivers/net/ethernet/ti/davinci_emac.c
index 5fae435..ee40f4e 100644
--- a/drivers/net/ethernet/ti/davinci_emac.c
+++ b/drivers/net/ethernet/ti/davinci_emac.c
@@ -2082,6 +2082,7 @@ static int davinci_emac_remove(struct platform_device *pdev)
 	cpdma_ctlr_destroy(priv->dma);
 
 	unregister_netdev(ndev);
+	pm_runtime_disable(&pdev->dev);
 	free_netdev(ndev);
 
 	return 0;
-- 
2.7.4