Re: [PATCH] I2C update for 2.6.10-rc1

From: Greg KH
Date: Tue Nov 09 2004 - 00:33:02 EST

ChangeSet 1.2014.1.21, 2004/11/08 16:45:21-08:00, khali@xxxxxxxxxxxx

[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@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <greg@xxxxxxxxx>

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;

+ /* 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);

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