From 0acc2b321342aa813fa9fc485afb09fbc811f594 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Sun, 29 Sep 2013 10:51:06 +0200 Subject: i2c: Remove redundant 'driver' field from the i2c_client struct The 'driver' field of the i2c_client struct is redundant. The same data can be accessed through to_i2c_driver(client->dev.driver). The generated code for both approaches in more or less the same. E.g. on ARM the expression client->driver->command(...) generates ... ldr r3, [r0, #28] ldr r3, [r3, #32] blx r3 ... and the expression to_i2c_driver(client->dev.driver)->command(...) generates ... ldr r3, [r0, #160] ldr r3, [r3, #-4] blx r3 ... Other architectures will generate similar code. All users of the 'driver' field outside of the I2C core have already been converted. So this only leaves the core itself. This patch converts the remaining few users in the I2C core and then removes the 'driver' field from the i2c_client struct. Signed-off-by: Lars-Peter Clausen Signed-off-by: Wolfram Sang --- drivers/i2c/i2c-core.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) (limited to 'drivers/i2c/i2c-core.c') diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 29d3f045a2b..430c001b3f1 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -248,17 +248,16 @@ static int i2c_device_probe(struct device *dev) driver = to_i2c_driver(dev->driver); if (!driver->probe || !driver->id_table) return -ENODEV; - client->driver = driver; + if (!device_can_wakeup(&client->dev)) device_init_wakeup(&client->dev, client->flags & I2C_CLIENT_WAKE); dev_dbg(dev, "probe\n"); status = driver->probe(client, i2c_match_id(driver->id_table, client)); - if (status) { - client->driver = NULL; + if (status) i2c_set_clientdata(client, NULL); - } + return status; } @@ -279,10 +278,9 @@ static int i2c_device_remove(struct device *dev) dev->driver = NULL; status = 0; } - if (status == 0) { - client->driver = NULL; + if (status == 0) i2c_set_clientdata(client, NULL); - } + return status; } @@ -1606,9 +1604,14 @@ static int i2c_cmd(struct device *dev, void *_arg) { struct i2c_client *client = i2c_verify_client(dev); struct i2c_cmd_arg *arg = _arg; + struct i2c_driver *driver; + + if (!client || !client->dev.driver) + return 0; - if (client && client->driver && client->driver->command) - client->driver->command(client, arg->cmd, arg->arg); + driver = to_i2c_driver(client->dev.driver); + if (driver->command) + driver->command(client, arg->cmd, arg->arg); return 0; } -- cgit v1.2.3-70-g09d2