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authorJean Delvare <khali@linux-fr.org>2010-10-24 20:16:58 +0400
committerJean Delvare <khali@endymion.delvare>2010-10-24 20:16:58 +0400
commit51b54ba9bb16b9fc28ec88006778d330af00bf8b (patch)
treed6d6da1639ada491d731d7452f6fc9272451944e /drivers/i2c
parentd57558d0f3b41bb260aaa327150d49f1810461f5 (diff)
downloadlinux-51b54ba9bb16b9fc28ec88006778d330af00bf8b.tar.xz
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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/i2c-core.c13
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index bdadfaf3fe10..d231f683f576 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1508,26 +1508,25 @@ static int i2c_detect(struct i2c_adapter *adapter, struct i2c_driver *driver)
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;
}