ChangeSet 1.2014.1.21, 2004/11/08 16:45:21-08:00, khali at linux-fr.org [PATCH] I2C: Check for unregistered adapter in i2c_del_adapter The patch adds a check at the beginning of i2c_del_adapter in case someone attempts to remove an adapter that was never added in the first place. This sounds like a good safety, as doing so will lead to an oops at the moment. Also, I have a need for it in the latest version of my i2c-amd756-s4882 patch. I need to remove the original adapter and install the virtual ones instead, but I have no way to know if the original adapter was succesfully added beforehand or not. Signed-off-by: Jean Delvare <khali at linux-fr.org> Signed-off-by: Greg Kroah-Hartman <greg at kroah.com> drivers/i2c/i2c-core.c | 13 +++++++++++++ 1 files changed, 13 insertions(+) diff -Nru a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c --- a/drivers/i2c/i2c-core.c 2004-11-08 18:54:39 -08:00 +++ b/drivers/i2c/i2c-core.c 2004-11-08 18:54:39 -08:00 @@ -177,11 +177,24 @@ int i2c_del_adapter(struct i2c_adapter *adap) { struct list_head *item, *_n; + struct i2c_adapter *adap_from_list; struct i2c_driver *driver; struct i2c_client *client; int res = 0; down(&core_lists); + + /* First make sure that this adapter was ever added */ + list_for_each_entry(adap_from_list, &adapters, list) { + if (adap_from_list == adap) + break; + } + if (adap_from_list != adap) { + pr_debug("I2C: Attempting to delete an unregistered " + "adapter\n"); + res = -EINVAL; + goto out_unlock; + } list_for_each(item,&drivers) { driver = list_entry(item, struct i2c_driver, list);