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From:   Wolfram Sang <wsa+renesas@sang-engineering.com>
To:     linux-i2c@vger.kernel.org
Cc:     linux-renesas-soc@vger.kernel.org,
        Hans de Goede <hdegoede@redhat.com>,
        linux-pm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        Wolfram Sang <wsa+renesas@sang-engineering.com>,
        Wolfram Sang <wsa@the-dreams.de>, linux-kernel@vger.kernel.org
Subject: [PATCH 02/10] i2c: reject new transfers when adapters are suspended
Date:   Wed, 19 Dec 2018 17:48:18 +0100
Message-Id: <20181219164827.20985-3-wsa+renesas@sang-engineering.com>
In-Reply-To: <20181219164827.20985-1-wsa+renesas@sang-engineering.com>
References: <20181219164827.20985-1-wsa+renesas@sang-engineering.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Using the new 'is_suspended' flag, we now reject new transfers if the
adapter is already marked suspended.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 Documentation/i2c/fault-codes | 4 ++++
 drivers/i2c/i2c-core-base.c   | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/Documentation/i2c/fault-codes b/Documentation/i2c/fault-codes
index 47c25abb7d52..0cee0fc545b4 100644
--- a/Documentation/i2c/fault-codes
+++ b/Documentation/i2c/fault-codes
@@ -112,6 +112,10 @@ EPROTO
 	case is when the length of an SMBus block data response
 	(from the SMBus slave) is outside the range 1-32 bytes.
 
+ESHUTDOWN
+	Returned when a transfer was requested using an adapter
+	which is already suspended.
+
 ETIMEDOUT
 	This is returned by drivers when an operation took too much
 	time, and was aborted before it completed.
diff --git a/drivers/i2c/i2c-core-base.c b/drivers/i2c/i2c-core-base.c
index 2c465455b2f6..926ca0a7477f 100644
--- a/drivers/i2c/i2c-core-base.c
+++ b/drivers/i2c/i2c-core-base.c
@@ -1866,6 +1866,8 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
 
 	if (WARN_ON(!msgs || num < 1))
 		return -EINVAL;
+	if (WARN_ON(test_bit(I2C_ALF_IS_SUSPENDED, &adap->locked_flags)))
+		return -ESHUTDOWN;
 
 	if (adap->quirks && i2c_check_for_quirks(adap, msgs, num))
 		return -EOPNOTSUPP;
-- 
2.11.0