SYSLINK NOTIFY Patch to fix premature read ioctl exit, iounmap related memory leak.

This patch for the notify module fixes the following issues:

	- Random signal of exit event given to the user
	  thread in the read ioctl call.
	- Memory leak because of the absence of
	  iounmap() call.
Signed-off-by: C A Subramaniam <subramaniam.ca@ti.com>

drivers/dsp/syslink/notify_ducatidriver/notify_ducati.c

@@ -536,7 +536,7 @@ int notify_ducatidrv_delete(struct notify_driver_object **handle_ptr)
 				recv_init_status = 0x0;
 			driver_obj->ctrl_ptr->proc_ctrl[driver_obj->self_id].
 				send_init_status = 0x0;
-			unmap_ducati_virt_mem((u32) driver_obj->ctrl_ptr);
+			unmap_ducati_virt_mem((u32)(driver_obj->ctrl_ptr));
 			driver_obj->ctrl_ptr = NULL;
 		}
 

drivers/dsp/syslink/omap_notify/drv_notify.c

@@ -271,12 +271,16 @@ static int notify_drv_read(struct file *filp, char *dst, size_t size,
 	}
 	ret_val = copy_to_user((void *)dst, u_buf,
 		sizeof(struct notify_drv_event_packet));
-	kfree(u_buf);
+
 	if (WARN_ON(ret_val != 0))
 		ret_val = -EFAULT;
 	if (u_buf->is_exit == true)
 		up(notifydrv_state.event_state[i].tersemhandle);
 
+	kfree(u_buf);
+	u_buf = NULL;
+
+
 func_end:
 	return ret_val ;
 }
@@ -599,7 +603,8 @@ static int notify_drv_add_buf_by_pid(u16 proc_id, u32 pid,
 		status = -EFAULT;
 		goto func_end;
 	}
-	u_buf = kmalloc(sizeof(struct notify_drv_event_packet), GFP_ATOMIC);
+	u_buf = kzalloc(sizeof(struct notify_drv_event_packet), GFP_ATOMIC);
+
 	if (u_buf != NULL) {
 		INIT_LIST_HEAD((struct list_head *)&u_buf->element);
 		u_buf->proc_id = proc_id;
@@ -617,7 +622,6 @@ static int notify_drv_add_buf_by_pid(u16 proc_id, u32 pid,
 			(struct list_head *)
 			&(notifydrv_state.event_state[i].buf_list));
 		mutex_unlock(notifydrv_state.gatehandle);
-
 		up(notifydrv_state.event_state[i].semhandle);
 		/* Termination packet */
 		if (is_exit == true) {