lincan/src/close_rtl.c

   1 /* close.c
   2  * Linux CAN-bus device driver.
   3  * Written by Arnaud Westenberg email:arnaud@wanadoo.nl
   4  * Rewritten for new CAN queues by Pavel Pisa - OCERA team member
   5  * email:pisa@cmp.felk.cvut.cz
   6  * This software is released under the GPL-License.
   7  * Version lincan-0.2  9 Jul 2003
   8  */
   9
  10 #ifdef CAN_WITH_RTL
  11
  12 #include "../include/can.h"
  13 #include "../include/can_sysdep.h"
  14 #include "../include/main.h"
  15
  16 #include <rtl_malloc.h>
  17 #include <rtl_posixio.h>
  18 #include "../include/can_iortl.h"
  19
  20 #define __NO_VERSION__
  21 #include <linux/module.h>
  22
  23 static inline
  24 int can_release_rtl_common(struct canuser_t *canuser, int file_flags)
  25 {
  26         struct canque_ends_t *qends;
  27         struct msgobj_t *obj;
  28         can_spin_irqflags_t iflags;
  29
  30         obj = canuser->msgobj;
  31         qends = canuser->qends;
  32
  33         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  34         list_del(&canuser->peers);
  35         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  36         canuser->qends = NULL;
  37         canqueue_ends_dispose_rtl(qends, file_flags & O_SYNC);
  38
  39         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  40         if(atomic_dec_and_test(&obj->obj_used)){
  41                 can_msgobj_clear_fl(obj,OPENED);
  42         };
  43         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  44
  45     #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
  46         MOD_DEC_USE_COUNT;
  47     #endif
  48
  49         return 0;
  50 }
  51
  52
  53 int can_release_rtl_posix(struct rtl_file *fptr)
  54 {
  55         struct canuser_t *canuser =
  56                 (struct canuser_t *)can_get_rtl_file_private_data(fptr);
  57         int ret;
  58
  59         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  60                 CANMSG("can_release_rtl_posix: bad canuser magic\n");
  61                 return -ENODEV;
  62         }
  63
  64         ret=can_release_rtl_common(canuser, fptr->f_flags);
  65
  66         rt_free(canuser);
  67
  68         return ret;
  69 }
  70
  71 #endif /*CAN_WITH_RTL*/
  72