xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

i2c: Remove redundant 'driver' field from the i2c_client struct

Browse Source 
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 <lars@metafoo.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Lars-Peter Clausen
2013-09-29 10:51:06 +02:00
committed by Wolfram Sang
parent 40df24997f
commit 0acc2b3213
3 changed files with 18 additions and 15 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
drivers/i2c/i2c-core.c
View File

@@ -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->driver && client->driver->command)
client->driver->command(client, arg->cmd, arg->arg);
if (!client || !client->dev.driver)
return 0;
driver = to_i2c_driver(client->dev.driver);
if (driver->command)
driver->command(client, arg->cmd, arg->arg);
return 0;
}