kernel/drivers/staging/ozwpan/ozurbparanoia.c

   1 /* -----------------------------------------------------------------------------
   2  * Copyright (c) 2011 Ozmo Inc
   3  * Released under the GNU General Public License Version 2 (GPLv2).
   4  * -----------------------------------------------------------------------------
   5  */
   6 #include <linux/usb.h>
   7 #include "ozdbg.h"
   8
   9 #ifdef WANT_URB_PARANOIA
  10
  11 #include "ozurbparanoia.h"
  12
  13 #define OZ_MAX_URBS     1000
  14 struct urb *g_urb_memory[OZ_MAX_URBS];
  15 int g_nb_urbs;
  16 DEFINE_SPINLOCK(g_urb_mem_lock);
  17
  18 void oz_remember_urb(struct urb *urb)
  19 {
  20         unsigned long irq_state;
  21
  22         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  23         if (g_nb_urbs < OZ_MAX_URBS) {
  24                 g_urb_memory[g_nb_urbs++] = urb;
  25                 oz_dbg(ON, "urb up = %d %p\n", g_nb_urbs, urb);
  26         } else {
  27                 oz_dbg(ON, "ERROR urb buffer full\n");
  28         }
  29         spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
  30 }
  31
  32 /*
  33  */
  34 int oz_forget_urb(struct urb *urb)
  35 {
  36         unsigned long irq_state;
  37         int i;
  38         int rc = -1;
  39
  40         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  41         for (i = 0; i < g_nb_urbs; i++) {
  42                 if (g_urb_memory[i] == urb) {
  43                         rc = 0;
  44                         if (--g_nb_urbs > i)
  45                                 memcpy(&g_urb_memory[i], &g_urb_memory[i+1],
  46                                         (g_nb_urbs - i) * sizeof(struct urb *));
  47                         oz_dbg(ON, "urb down = %d %p\n", g_nb_urbs, urb);
  48                 }
  49         }
  50         spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
  51         return rc;
  52 }
  53 #endif /* #ifdef WANT_URB_PARANOIA */
  54