i2c: Sanity checks on adapter registration

Make sure I2C adapters being registered have the required struct
fields set. If they don't, problems will happen later.

Signed-off-by: Jean Delvare <khali@linux-fr.org>

diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index d231f683f5763bc286e98200fc46286b35ef65a6..6b4cc567645b4e9d936b47bc0c777a05dc9222b9 100644 (file)
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -848,6 +848,18 @@ static int i2c_register_adapter(struct i2c_adapter *adap)
                goto out_list;
        }
 
+       /* Sanity checks */
+       if (unlikely(adap->name[0] == '\0')) {
+               pr_err("i2c-core: Attempt to register an adapter with "
+                      "no name!\n");
+               return -EINVAL;
+       }
+       if (unlikely(!adap->algo)) {
+               pr_err("i2c-core: Attempt to register adapter '%s' with "
+                      "no algo!\n", adap->name);
+               return -EINVAL;
+       }
+
        rt_mutex_init(&adap->bus_lock);
        mutex_init(&adap->userspace_clients_lock);
        INIT_LIST_HEAD(&adap->userspace_clients);