[PATCH v2 5/8] HID: i2c-hid: remove custom locking from i2c_hid_open/close

[Dmitry Torokhov]

Now that HID core enforces serialization of transport driver open/close
calls we can remove custom locking from i2c-hid driver.

Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>
---
 drivers/hid/i2c-hid/i2c-hid.c | 32 +++++++++-----------------------
 1 file changed, 9 insertions(+), 23 deletions(-)

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index fb55fb4c39fc..6355015ed249 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -743,18 +743,12 @@ static int i2c_hid_open(struct hid_device *hid)
        struct i2c_hid *ihid = i2c_get_clientdata(client);
        int ret = 0;
 
-       mutex_lock(&i2c_hid_open_mut);
-       if (!hid->open++) {
-               ret = pm_runtime_get_sync(&client->dev);
-               if (ret < 0) {
-                       hid->open--;
-                       goto done;
-               }
-               set_bit(I2C_HID_STARTED, &ihid->flags);
-       }
-done:
-       mutex_unlock(&i2c_hid_open_mut);
-       return ret < 0 ? ret : 0;
+       ret = pm_runtime_get_sync(&client->dev);
+       if (ret < 0)
+               return ret;
+
+       set_bit(I2C_HID_STARTED, &ihid->flags);
+       return 0;
 }
 
 static void i2c_hid_close(struct hid_device *hid)
@@ -762,18 +756,10 @@ static void i2c_hid_close(struct hid_device *hid)
        struct i2c_client *client = hid->driver_data;
        struct i2c_hid *ihid = i2c_get_clientdata(client);
 
-       /* protecting hid->open to make sure we don't restart
-        * data acquistion due to a resumption we no longer
-        * care about
-        */
-       mutex_lock(&i2c_hid_open_mut);
-       if (!--hid->open) {
-               clear_bit(I2C_HID_STARTED, &ihid->flags);
+       clear_bit(I2C_HID_STARTED, &ihid->flags);
 
-               /* Save some power */
-               pm_runtime_put(&client->dev);
-       }
-       mutex_unlock(&i2c_hid_open_mut);
+       /* Save some power */
+       pm_runtime_put(&client->dev);
 }
 
 static int i2c_hid_power(struct hid_device *hid, int lvl)
-- 
2.13.0.506.g27d5fe0cd-goog