i2c: Optimize function i2c_detect()
Check the class flags before allocating the temporary i2c_client
structure, to avoid allocating it when we don't need it.
Also optimize the inner loop a bit.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index bdadfaf..d231f68 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1508,26 +1508,25 @@
if (!driver->detect || !address_list)
return 0;
+ /* Stop here if the classes do not match */
+ if (!(adapter->class & driver->class))
+ return 0;
+
/* Set up a temporary client to help detect callback */
temp_client = kzalloc(sizeof(struct i2c_client), GFP_KERNEL);
if (!temp_client)
return -ENOMEM;
temp_client->adapter = adapter;
- /* Stop here if the classes do not match */
- if (!(adapter->class & driver->class))
- goto exit_free;
-
for (i = 0; address_list[i] != I2C_CLIENT_END; i += 1) {
dev_dbg(&adapter->dev, "found normal entry for adapter %d, "
"addr 0x%02x\n", adap_id, address_list[i]);
temp_client->addr = address_list[i];
err = i2c_detect_address(temp_client, driver);
- if (err)
- goto exit_free;
+ if (unlikely(err))
+ break;
}
- exit_free:
kfree(temp_client);
return err;
}