[PATCH 02/10] i2c: reject new transfers when adapters are suspended

Wolfram Sang
2018-12-19T16:48:18Z

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