lincan/src/close.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-0.3  17 Jun 2004
   8  */
   9
  10 #include "../include/can.h"
  11 #include "../include/can_sysdep.h"
  12 #include "../include/main.h"
  13 #include "../include/close.h"
  14 #include "../include/setup.h"
  15 #include "../include/fasync.h"
  16
  17 #define __NO_VERSION__
  18 #include <linux/module.h>
  19
  20 int can_close(struct inode *inode, struct file *file)
  21 {
  22         struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
  23         struct canque_ends_t *qends;
  24         struct msgobj_t *obj;
  25         can_spin_irqflags_t iflags;
  26
  27         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  28                 CANMSG("can_close: bad canuser magic\n");
  29                 return -ENODEV;
  30         }
  31
  32         obj = canuser->msgobj;
  33         qends = canuser->qends;
  34
  35     #ifdef CAN_ENABLE_KERN_FASYNC
  36
  37         can_fasync(-1, file, 0);
  38
  39     #endif /*CAN_ENABLE_KERN_FASYNC*/
  40
  41         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  42         list_del(&canuser->peers);
  43         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  44         canuser->qends = NULL;
  45         canqueue_ends_dispose_kern(qends, file->f_flags & O_SYNC);
  46
  47         kfree(canuser);
  48
  49         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  50         if(atomic_dec_and_test(&obj->obj_used)){
  51                 can_msgobj_clear_fl(obj,OPENED);
  52         };
  53         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  54
  55     #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
  56         MOD_DEC_USE_COUNT;
  57     #endif
  58         return 0;
  59 }