ozurbparanoia.c

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/* -----------------------------------------------------------------------------
 * Copyright (c) 2011 Ozmo Inc
 * Released under the GNU General Public License Version 2 (GPLv2).
 * -----------------------------------------------------------------------------
 */
#include <linux/usb.h>
#include "ozconfig.h"
#ifdef WANT_URB_PARANOIA
#include "ozurbparanoia.h"
#include "oztrace.h"
/*-----------------------------------------------------------------------------
 */
#define OZ_MAX_URBS 1000
struct urb *g_urb_memory[OZ_MAX_URBS];
int g_nb_urbs;
DEFINE_SPINLOCK(g_urb_mem_lock);
/*-----------------------------------------------------------------------------
 */
void oz_remember_urb(struct urb *urb)
{
    unsigned long irq_state;
    spin_lock_irqsave(&g_urb_mem_lock, irq_state);
    if (g_nb_urbs < OZ_MAX_URBS) {
        g_urb_memory[g_nb_urbs++] = urb;
        oz_trace("%lu: urb up = %d %p\n", jiffies, g_nb_urbs, urb);
    } else {
        oz_trace("ERROR urb buffer full\n");
    }
    spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
}
/*------------------------------------------------------------------------------
 */
int oz_forget_urb(struct urb *urb)
{
    unsigned long irq_state;
    int i;
    int rc = -1;
    spin_lock_irqsave(&g_urb_mem_lock, irq_state);
    for (i = 0; i < g_nb_urbs; i++) {
        if (g_urb_memory[i] == urb) {
            rc = 0;
            if (--g_nb_urbs > i)
                memcpy(&g_urb_memory[i], &g_urb_memory[i+1],
                    (g_nb_urbs - i) * sizeof(struct urb *));
            oz_trace("%lu: urb down = %d %p\n",
                jiffies, g_nb_urbs, urb);
        }
    }
    spin_unlock_irqrestore(&g_urb_mem_lock, irq_state);
    return rc;
}
#endif /* #ifdef WANT_URB_PARANOIA */