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[PATCH] i2c: Prevent deadlock on i2c client registration 

Delay the call to adapter->client_register() until after we are
certain that the client registration is a success. At this point the
client is fully initialized and we no longer hold the adapter->clist
mutex, so this should prevent the deadlocks if the client_register()
callback needs to take that mutex too, as is the case for the bttv
driver.

This fixes bug #7234.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
hifive-unleashed-5.1
Jean Delvare 2006-09-30 17:18:59 +02:00 committed by Linus Torvalds
parent 5ffd1a6aaa
commit 77ed74da26
1 changed files with 13 additions and 12 deletions
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25
drivers/i2c/i2c-core.c
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@ -420,14 +420,6 @@ int i2c_attach_client(struct i2c_client *client)
}
list_add_tail(&client->list,&adapter->clients);
if (adapter->client_register) {
if (adapter->client_register(client)) {
dev_dbg(&adapter->dev, "client_register "
"failed for client [%s] at 0x%02x\n",
client->name, client->addr);
}
}
client->usage_count = 0;
client->dev.parent = &client->adapter->dev;
@ -445,10 +437,17 @@ int i2c_attach_client(struct i2c_client *client)
res = device_create_file(&client->dev, &dev_attr_client_name);
if (res)
goto out_unregister;
out_unlock:
mutex_unlock(&adapter->clist_lock);
return res;
if (adapter->client_register) {
if (adapter->client_register(client)) {
dev_dbg(&adapter->dev, "client_register "
"failed for client [%s] at 0x%02x\n",
client->name, client->addr);
}
}
return 0;
out_unregister:
init_completion(&client->released); /* Needed? */
@ -458,7 +457,9 @@ out_list:
list_del(&client->list);
dev_err(&adapter->dev, "Failed to attach i2c client %s at 0x%02x "
"(%d)\n", client->name, client->addr, res);
goto out_unlock;
out_unlock:
mutex_unlock(&adapter->clist_lock);
return res;
}