diff options
| author | Pantelis Antoniou <pantelis.antoniou@konsulko.com> | 2015-01-24 09:16:29 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2015-07-09 22:25:54 +0200 |
| commit | 4f001fd30145a6a8f72f9544c982cfd3dcb7c6df (patch) | |
| tree | 5d21ee5c7ded9bc74c2f1448bd045f71c53d312f | |
| parent | eb8173e3d7b94664ecd3acf34942c9c9d6f6cb73 (diff) | |
| download | linux-4f001fd30145a6a8f72f9544c982cfd3dcb7c6df.tar.gz | |
i2c: Mark instantiated device nodes with OF_POPULATE
Mark (and unmark) device nodes with the POPULATE flag as appropriate.
This is required to avoid multi probing when using I2C and device
overlays containing a mux.
This patch is also more careful with the release of the adapter device
which caused a deadlock with muxes, and does not break the build
on !OF since the node flag accessors are not defined then.
Signed-off-by: Pantelis Antoniou <pantelis.antoniou@konsulko.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/i2c-core.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 069a41f116ddcd..e6d4935161e490 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -1012,6 +1012,8 @@ EXPORT_SYMBOL_GPL(i2c_new_device); */ void i2c_unregister_device(struct i2c_client *client) { + if (client->dev.of_node) + of_node_clear_flag(client->dev.of_node, OF_POPULATED); device_unregister(&client->dev); } EXPORT_SYMBOL_GPL(i2c_unregister_device); @@ -1320,8 +1322,11 @@ static void of_i2c_register_devices(struct i2c_adapter *adap) dev_dbg(&adap->dev, "of_i2c: walking child nodes\n"); - for_each_available_child_of_node(adap->dev.of_node, node) + for_each_available_child_of_node(adap->dev.of_node, node) { + if (of_node_test_and_set_flag(node, OF_POPULATED)) + continue; of_i2c_register_device(adap, node); + } } static int of_dev_node_match(struct device *dev, void *data) @@ -1853,6 +1858,11 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action, if (adap == NULL) return NOTIFY_OK; /* not for us */ + if (of_node_test_and_set_flag(rd->dn, OF_POPULATED)) { + put_device(&adap->dev); + return NOTIFY_OK; + } + client = of_i2c_register_device(adap, rd->dn); put_device(&adap->dev); @@ -1863,6 +1873,10 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action, } break; case OF_RECONFIG_CHANGE_REMOVE: + /* already depopulated? */ + if (!of_node_check_flag(rd->dn, OF_POPULATED)) + return NOTIFY_OK; + /* find our device by node */ client = of_find_i2c_device_by_node(rd->dn); if (client == NULL) |