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/i82527.h"
  15 #include "../include/setup.h"
  16 #include "../include/fasync.h"
  17
  18 #define __NO_VERSION__
  19 #include <linux/module.h>
  20
  21 int can_close(struct inode *inode, struct file *file)
  22 {
  23         struct canuser_t *canuser = (struct canuser_t*)(file->private_data);
  24         struct canque_ends_t *qends;
  25         struct msgobj_t *obj;
  26         can_spin_irqflags_t iflags;
  27
  28         if(!canuser || (canuser->magic != CAN_USER_MAGIC)){
  29                 CANMSG("can_close: bad canuser magic\n");
  30                 return -ENODEV;
  31         }
  32
  33         obj = canuser->msgobj;
  34         qends = canuser->qends;
  35
  36     #ifdef CAN_ENABLE_KERN_FASYNC
  37
  38         can_fasync(-1, file, 0);
  39
  40     #endif /*CAN_ENABLE_KERN_FASYNC*/
  41
  42         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  43         list_del(&canuser->peers);
  44         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  45         canuser->qends = NULL;
  46         canqueue_ends_dispose_kern(qends, file->f_flags & O_SYNC);
  47
  48         kfree(canuser);
  49
  50         can_spin_lock_irqsave(&canuser_manipulation_lock, iflags);
  51         if(atomic_dec_and_test(&obj->obj_used)){
  52                 can_msgobj_clear_fl(obj,OPENED);
  53         };
  54         can_spin_unlock_irqrestore(&canuser_manipulation_lock, iflags);
  55
  56     #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,50))
  57         MOD_DEC_USE_COUNT;
  58     #endif
  59         return 0;
  60 }