mfd: Fix dangling pointers

Fix I2C-drivers which missed setting clientdata to NULL before freeing the
structure it points to. Also fix drivers which do this _after_ the structure
was freed already.

Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/mfd/ab3100-core.c b/drivers/mfd/ab3100-core.c
index e4ca5909e42..16898211cd1 100644
--- a/drivers/mfd/ab3100-core.c
+++ b/drivers/mfd/ab3100-core.c
@@ -920,6 +920,7 @@ static int __init ab3100_probe(struct i2c_client *client,
         i2c_unregister_device(ab3100->testreg_client);
  exit_no_testreg_client:
  exit_no_detect:
+        i2c_set_clientdata(client, NULL);
         kfree(ab3100);
         return err;
 }
@@ -941,6 +942,7 @@ static int __exit ab3100_remove(struct i2c_client *client)
          * their notifiers so deactivate IRQ
          */
         free_irq(client->irq, ab3100);
+        i2c_set_clientdata(client, NULL);
         kfree(ab3100);
         return 0;
 }