atm: add owner of push() callback to atmvcc

The atm is using atmvcc->push(vcc, NULL) callback to notify protocol
that vcc will be closed and protocol must detach from it. This callback
is usually used by protocol to decrement module usage count by module_put(),
but it leaves small window then module is still used after module_put().

Now the owner of push() callback is kept in atmvcc and
module_put(atmvcc->owner) is called after the protocol is detached from vcc.

Signed-off-by: Krzysztof Mazur <krzysiek@podlesie.net>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Acked-by: Chas Williams <chas@cmf.nrl.navy.mil>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/atmdev.h b/include/linux/atmdev.h
index 22ef21c33d0c..72db2af902a8 100644
--- a/include/linux/atmdev.h
+++ b/include/linux/atmdev.h
@@ -106,6 +106,7 @@ struct atm_vcc {
         void            *dev_data;      /* per-device data */
         void            *proto_data;    /* per-protocol data */
         struct k_atm_aal_stats *stats;  /* pointer to AAL stats group */
+        struct module *owner;           /* owner of ->push function */
         /* SVC part --- may move later ------------------------------------- */
         short           itf;            /* interface number */
         struct sockaddr_atmsvc local;