linux-kernel - [PATCH 3.16.y-ckt 141/180] i2c: Mark adapter devices with pm_runtime_no

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Message-Id: <1430991989-23170-142-git-send-email-luis.henriques@canonical.com>
Date:	Thu,  7 May 2015 10:45:50 +0100
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 141/180] i2c: Mark adapter devices with pm_runtime_no_callbacks

3.16.7-ckt11 -stable review patch.  If anyone has any objections, please let me know.

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

From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>

commit 6ada5c1e1b077ab98fc144d7ac132b4dcc0148ec upstream.

Commit 523c5b89640e ("i2c: Remove support for legacy PM") removed the PM
ops from the bus type, which causes the pm operations on the s3c2410
adapter device to fail (-ENOSUPP in rpm_callback). The adapter device
doesn't get bound to a driver and as such can't have its own pm_runtime
callbacks. Previously this was fine as the bus callbacks would have been
used, but now this can cause devices which use PM runtime and are
attached over I2C to fail to resume.

This commit fixes this issue by marking all adapter devices with
pm_runtime_no_callbacks, since they can't have any.

Signed-off-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com>
Acked-by: Beata Michalska <b.michalska@...sung.com>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Fixes: 523c5b89640e
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 drivers/i2c/i2c-core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index 7c7f4b856bad..4c349b119642 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1249,6 +1249,8 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
 
 	dev_dbg(&adap->dev, "adapter [%s] registered\n", adap->name);
 
+	pm_runtime_no_callbacks(&adap->dev);
+
 #ifdef CONFIG_I2C_COMPAT
 	res = class_compat_create_link(i2c_adapter_compat_class, &adap->dev,
 				       adap->dev.parent);
--
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