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 #include "ozconfig.h"
   9 #ifdef WANT_URB_PARANOIA
  10 #include "ozurbparanoia.h"
  11 #include "oztrace.h"
  12 /*-----------------------------------------------------------------------------
  13  */
  14 #define OZ_MAX_URBS     1000
  15 struct urb *g_urb_memory[OZ_MAX_URBS];
  16 int g_nb_urbs;
  17 DEFINE_SPINLOCK(g_urb_mem_lock);
  18 /*-----------------------------------------------------------------------------
  19  */
  20 void oz_remember_urb(struct urb *urb)
  21 {
  22         unsigned long irq_state;
  23         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  24         if (g_nb_urbs < OZ_MAX_URBS) {
  25                 g_urb_memory[g_nb_urbs++] = urb;
  26                 oz_dbg(ON, "%lu: urb up = %d %p\n", jiffies, g_nb_urbs, urb);
  27         } else {
  28                 oz_dbg(ON, "ERROR urb buffer full\n");
  29         }
  30         spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
  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         spin_lock_irqsave(&g_urb_mem_lock, irq_state);
  40         for (i = 0; i < g_nb_urbs; i++) {
  41                 if (g_urb_memory[i] == urb) {
  42                         rc = 0;
  43                         if (--g_nb_urbs > i)
  44                                 memcpy(&g_urb_memory[i], &g_urb_memory[i+1],
  45                                         (g_nb_urbs - i) * sizeof(struct urb *));
  46                         oz_dbg(ON, "%lu: urb down = %d %p\n",
  47                                jiffies, 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