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 /*-----------------------------------------------------------------------------
  14  */
  15 #define OZ_MAX_URBS     1000
  16 struct urb *g_urb_memory[OZ_MAX_URBS];
  17 int g_nb_urbs;
  18 DEFINE_SPINLOCK(g_urb_mem_lock);
  19
  20 /*-----------------------------------------------------------------------------
  21  */
  22 void oz_remember_urb(struct urb *urb)
  23 {
  24         unsigned long irq_state;
  25
  26         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  27         if (g_nb_urbs < OZ_MAX_URBS) {
  28                 g_urb_memory[g_nb_urbs++] = urb;
  29                 oz_dbg(ON, "urb up = %d %p\n", g_nb_urbs, urb);
  30         } else {
  31                 oz_dbg(ON, "ERROR urb buffer full\n");
  32         }
  33         spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
  34 }
  35
  36 /*------------------------------------------------------------------------------
  37  */
  38 int oz_forget_urb(struct urb *urb)
  39 {
  40         unsigned long irq_state;
  41         int i;
  42         int rc = -1;
  43
  44         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  45         for (i = 0; i < g_nb_urbs; i++) {
  46                 if (g_urb_memory[i] == urb) {
  47                         rc = 0;
  48                         if (--g_nb_urbs > i)
  49                                 memcpy(&g_urb_memory[i], &g_urb_memory[i+1],
  50                                         (g_nb_urbs - i) * sizeof(struct urb *));
  51                         oz_dbg(ON, "urb down = %d %p\n", g_nb_urbs, urb);
  52                 }
  53         }
  54         spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
  55         return rc;
  56 }
  57 #endif /* #ifdef WANT_URB_PARANOIA */
  58