/***************************************************************************** * sdlamain.c WANPIPE(tm) Multiprotocol WAN Link Driver. Main module. * * Author: Nenad Corbic * Gideon Hack * * Copyright: (c) 1995-1999 Sangoma Technologies Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. * ============================================================================ * Sep 23, 1999 Nenad Corbic Added support for SMP * Sep 13, 1999 Nenad Corbic Each port is treated as a separate device. * Jun 02, 1999 Gideon Hack Added support for the S514 adapter. * Updates for Linux 2.2.X kernels. * Sep 17, 1998 Jaspreet Singh Updated for 2.1.121+ kernel * Nov 28, 1997 Jaspreet Singh Changed DRV_RELEASE to 1 * Nov 10, 1997 Jaspreet Singh Changed sti() to restore_flags(); * Nov 06, 1997 Jaspreet Singh Changed DRV_VERSION to 4 and DRV_RELEASE to 0 * Oct 20, 1997 Jaspreet Singh Modified sdla_isr routine so that card->in_isr * assignments are taken out and placed in the * sdla_ppp.c, sdla_fr.c and sdla_x25.c isr * routines. Took out 'wandev->tx_int_enabled' and * replaced it with 'wandev->enable_tx_int'. * May 29, 1997 Jaspreet Singh Flow Control Problem * added "wandev->tx_int_enabled=1" line in the * init module. This line intializes the flag for * preventing Interrupt disabled with device set to * busy * Jan 15, 1997 Gene Kozin Version 3.1.0 * o added UDP management stuff * Jan 02, 1997 Gene Kozin Initial version. *****************************************************************************/ #include #include /* OS configuration options */ #include /* offsetof(), etc. */ #include /* return codes */ #include /* inline memset(), etc. */ #include /* kmalloc(), kfree() */ #include /* printk(), and other useful stuff */ #include /* support for loadable modules */ #include /* request_region(), release_region() */ #include /* for kernel task queues */ #include /* WAN router definitions */ #include /* WANPIPE common user API definitions */ #include /* kernel <-> user copy */ #include /* phys_to_virt() */ #include #include /****** Defines & Macros ****************************************************/ #ifdef _DEBUG_ #define STATIC #else #define STATIC static #endif #define DRV_VERSION 5 /* version number */ #define DRV_RELEASE 0 /* release (minor version) number */ #define MAX_CARDS 8 /* max number of adapters */ #ifndef CONFIG_WANPIPE_CARDS /* configurable option */ #define CONFIG_WANPIPE_CARDS 1 #endif #define CMD_OK 0 /* normal firmware return code */ #define CMD_TIMEOUT 0xFF /* firmware command timed out */ #define MAX_CMD_RETRY 10 /* max number of firmware retries */ /****** Function Prototypes *************************************************/ extern void disable_irq(unsigned int); extern void enable_irq(unsigned int); /* Module entry points */ int init_module (void); void cleanup_module (void); /* WAN link driver entry points */ static int setup (wan_device_t* wandev, wandev_conf_t* conf); static int shutdown (wan_device_t* wandev); static int ioctl (wan_device_t* wandev, unsigned cmd, unsigned long arg); /* IOCTL handlers */ static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump); static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec); /* Miscellaneous functions */ STATIC void sdla_isr (int irq, void* dev_id, struct pt_regs *regs); STATIC void sdla_poll (void* data); static void release_hw (sdla_t *card); /****** Global Data ********************************************************** * Note: All data must be explicitly initialized!!! */ /* private data */ static char drvname[] = "wanpipe"; static char fullname[] = "WANPIPE(tm) Multiprotocol Driver"; static char copyright[] = "(c) 1995-1999 Sangoma Technologies Inc."; static int ncards = CONFIG_WANPIPE_CARDS; static int active; /* number of active cards */ static sdla_t* card_array; /* adapter data space */ /* Task queue element for creating a 'thread' */ static struct tq_struct sdla_tq = { routine: sdla_poll }; /******* Kernel Loadable Module Entry Points ********************************/ /*============================================================================ * Module 'insert' entry point. * o print announcement * o allocate adapter data space * o initialize static data * o register all cards with WAN router * o calibrate SDLA shared memory access delay. * * Return: 0 Ok * < 0 error. * Context: process */ #ifdef MODULE int init_module (void) #else int wanpipe_init2(void) #endif { int cnt, err = 0; printk(KERN_INFO "%s v%u.%u %s\n", fullname, DRV_VERSION, DRV_RELEASE, copyright); /* Verify number of cards and allocate adapter data space */ ncards = min(ncards, MAX_CARDS); ncards = max(ncards, 1); card_array = kmalloc(sizeof(sdla_t) * ncards, GFP_KERNEL); if (card_array == NULL) return -ENOMEM; memset(card_array, 0, sizeof(sdla_t) * ncards); /* Register adapters with WAN router */ for (cnt = 0; cnt < ncards; ++ cnt) { sdla_t* card = &card_array[cnt]; wan_device_t* wandev = &card->wandev; card->next = NULL; sprintf(card->devname, "%s%d", drvname, cnt + 1); wandev->magic = ROUTER_MAGIC; wandev->name = card->devname; wandev->private = card; wandev->enable_tx_int = 0; wandev->setup = &setup; wandev->shutdown = &shutdown; wandev->ioctl = &ioctl; err = register_wan_device(wandev); if (err) { printk(KERN_ERR "%s: %s registration failed with error %d!\n", drvname, card->devname, err); break; } } if (cnt){ ncards = cnt; /* adjust actual number of cards */ }else { kfree(card_array); printk(KERN_INFO "IN Init Module: NO Cards registered\n"); err = -ENODEV; } return err; } #ifdef MODULE /*============================================================================ * Module 'remove' entry point. * o unregister all adapters from the WAN router * o release all remaining system resources */ void cleanup_module (void) { int i; for (i = 0; i < ncards; ++i) { sdla_t* card = &card_array[i]; unregister_wan_device(card->devname); } kfree(card_array); } #endif /******* WAN Device Driver Entry Points *************************************/ /*============================================================================ * Setup/configure WAN link driver. * o check adapter state * o make sure firmware is present in configuration * o make sure I/O port and IRQ are specified * o make sure I/O region is available * o allocate interrupt vector * o setup SDLA hardware * o call appropriate routine to perform protocol-specific initialization * o mark I/O region as used * o if this is the first active card, then schedule background task * * This function is called when router handles ROUTER_SETUP IOCTL. The * configuration structure is in kernel memory (including extended data, if * any). */ static int setup (wan_device_t* wandev, wandev_conf_t* conf) { sdla_t* card; int err = 0; int irq=0; int i; /* Sanity checks */ if ((wandev == NULL) || (wandev->private == NULL) || (conf == NULL)) return -EFAULT; card = wandev->private; if (wandev->state != WAN_UNCONFIGURED) return -EBUSY; /* already configured */ printk(KERN_INFO "\nProcessing WAN device %s...\n", wandev->name); /* Initialize the counters for each wandev * Used for counting number of times new_if and * del_if get called. */ wandev->del_if_cnt = 0; wandev->new_if_cnt = 0; wandev->config_id = conf->config_id; if (!conf->data_size || (conf->data == NULL)) { printk(KERN_ERR "%s: firmware not found in configuration data!\n", wandev->name); return -EINVAL; } /* only check I/O port and IRQ if not an S514 adapter */ if(!conf->S514_CPU_no[0]) { if (conf->ioport <= 0) { printk(KERN_ERR "%s: can't configure without I/O port address!\n", wandev->name); return -EINVAL; } if (conf->irq <= 0) { printk(KERN_ERR "%s: can't configure without IRQ!\n", wandev->name); return -EINVAL; } /* Check for already loaded card with the same IO port and IRQ * If found, copy its hardware configuration and use its * resources (i.e. piggybacking) */ if (!card->configured){ for (i = 0; i < ncards; i ++) { sdla_t *nxt_card = &card_array[i]; if (nxt_card->hw.port == conf->ioport && nxt_card != card && conf->config_id == WANCONFIG_CHDLC && nxt_card->wandev.config_id == WANCONFIG_CHDLC){ irq = nxt_card->hw.irq; memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t)); nxt_card->next = card; card->next = nxt_card; card->wandev.piggyback = WANOPT_YES; } } /* Make sure I/O port region is available */ if (check_region(conf->ioport, SDLA_MAXIORANGE) && !card->wandev.piggyback) { printk(KERN_ERR "%s: I/O region 0x%X - 0x%X is in use!\n", wandev->name, conf->ioport, conf->ioport + SDLA_MAXIORANGE); return -EINVAL; } } } /* For a S514 adapter, check for a possible configuration error in that we are loading an adapter in the same slot as a previously loaded S514 card. */ else { if (!card->configured){ for (i = 0; i < ncards; i ++) { sdla_t* nxt_card = &card_array[i]; if(nxt_card == card) continue; if((nxt_card->hw.type == SDLA_S514) && (nxt_card->hw.S514_slot_no == conf->PCI_slot_no) && (nxt_card->hw.S514_cpu_no[0] == conf->S514_CPU_no[0])&& (conf->config_id == WANCONFIG_CHDLC)&& (nxt_card->wandev.config_id == WANCONFIG_CHDLC)){ irq = nxt_card->hw.irq; memcpy(&card->hw, &nxt_card->hw, sizeof(sdlahw_t)); nxt_card->next = card; card->next = nxt_card; card->wandev.piggyback = WANOPT_YES; } } } } /* If the current card has already been configured * or its a piggyback card, do not try to allocate * resources. */ if (!card->wandev.piggyback && !card->configured){ /* Configure hardware, load firmware, etc. */ memset(&card->hw, 0, sizeof(sdlahw_t)); /* for an S514 adapter, pass the CPU number and the slot number read */ /* from 'router.conf' to the 'sdla_setup()' function via the 'port' */ /* parameter */ if (conf->S514_CPU_no[0]){ card->hw.S514_cpu_no[0] = conf->S514_CPU_no[0]; card->hw.S514_slot_no = conf->PCI_slot_no; printk(KERN_INFO "Setting CPU to %c and Slot to %i\n", card->hw.S514_cpu_no[0], card->hw.S514_slot_no); }else{ /* 508 Card io port and irq initialization */ card->hw.port = conf->ioport; card->hw.irq = (conf->irq == 9) ? 2 : conf->irq; } /* Compute the virtual address of the card in kernel space */ if(conf->maddr) card->hw.dpmbase = phys_to_virt(conf->maddr); else /* But 0 means NULL */ card->hw.dpmbase = (void *)conf->maddr; card->hw.dpmsize = SDLA_WINDOWSIZE; /* set the adapter type if using an S514 adapter */ card->hw.type = (conf->S514_CPU_no[0]) ? SDLA_S514 : conf->hw_opt[0]; card->hw.pclk = conf->hw_opt[1]; err = sdla_setup(&card->hw, conf->data, conf->data_size); if (err){ return err; } if(card->hw.type != SDLA_S514) irq = (conf->irq == 2) ? 9 : conf->irq; /* IRQ2 -> IRQ9 */ else irq = card->hw.irq; /* request an interrupt vector - note that interrupts may be shared */ /* when using the S514 PCI adapter */ if(request_irq(irq, sdla_isr, (card->hw.type == SDLA_S514) ? SA_SHIRQ : 0, wandev->name, card)){ printk(KERN_ERR "%s: Can't reserve IRQ %d!\n", wandev->name, irq); return -EINVAL; } }else{ printk(KERN_INFO "%s: Card Configured %i or Piggybacking %i!\n", wandev->name,card->configured,card->wandev.piggyback); } if (!card->configured){ #ifdef CONFIG_SMP /* Initialize the Spin lock */ printk(KERN_INFO "%s: Initializing SMP\n",wandev->name); spin_lock_init(&card->lock); #endif /* Intialize WAN device data space */ wandev->irq = irq; wandev->dma = 0; if(card->hw.type != SDLA_S514){ wandev->ioport = card->hw.port; }else{ wandev->S514_cpu_no[0] = card->hw.S514_cpu_no[0]; wandev->S514_slot_no = card->hw.S514_slot_no; } wandev->maddr = (unsigned long)card->hw.dpmbase; wandev->msize = card->hw.dpmsize; wandev->hw_opt[0] = card->hw.type; wandev->hw_opt[1] = card->hw.pclk; wandev->hw_opt[2] = card->hw.memory; wandev->hw_opt[3] = card->hw.fwid; } /* Protocol-specific initialization */ switch (card->hw.fwid) { #ifdef CONFIG_WANPIPE_X25 case SFID_X25_502: case SFID_X25_508: err = wpx_init(card, conf); break; #endif #ifdef CONFIG_WANPIPE_FR case SFID_FR502: case SFID_FR508: err = wpf_init(card, conf); break; #endif #ifdef CONFIG_WANPIPE_PPP case SFID_PPP502: case SFID_PPP508: err = wpp_init(card, conf); break; #endif #ifdef CONFIG_WANPIPE_CHDLC case SFID_CHDLC508: case SFID_CHDLC514: // if (conf->ft1){ // printk(KERN_INFO "%s: Starting FT1 Configurator\n", // card->devname); // err = wpft1_init(card, conf); // }else{ err = wpc_init(card, conf); // } break; #endif #ifdef CONFIG_WANPIPE_BSTRM case SFID_BSC502: err = bsc_init(card, conf); break; #endif #ifdef CONFIG_WANPIPE_HDLC case SFID_HDLC508: err = hdlc_init(card, conf); break; #endif default: printk(KERN_ERR "%s: this firmware is not supported %X %X!\n", wandev->name,card->hw.fwid,SFID_CHDLC508); err = -EINVAL; } if (err){ release_hw(card); return err; } /* Reserve I/O region and schedule background task */ if(card->hw.type != SDLA_S514 && !card->wandev.piggyback) request_region(card->hw.port, card->hw.io_range, wandev->name); if (++active == 1) { MOD_INC_USE_COUNT; if (schedule_task(&sdla_tq) == 0) MOD_DEC_USE_COUNT; } wandev->critical = 0; return 0; } /*============================================================================ * Shut down WAN link driver. * o shut down adapter hardware * o release system resources. * * This function is called by the router when device is being unregistered or * when it handles ROUTER_DOWN IOCTL. */ static int shutdown (wan_device_t* wandev) { sdla_t *card; /* sanity checks */ if ((wandev == NULL) || (wandev->private == NULL)) return -EFAULT; if (wandev->state == WAN_UNCONFIGURED) return 0; /* If we are in a critical section we lose */ if (test_and_set_bit(0, (void*)&wandev->critical)) return -EAGAIN; card = wandev->private; wandev->state = WAN_UNCONFIGURED; if (--active == 0) schedule(); /* stop background thread */ /* Release Resources */ release_hw(card); /* only free the allocated I/O range if not an S514 adapter */ if (wandev->hw_opt[0] != SDLA_S514 && !card->configured){ release_region(card->hw.port, card->hw.io_range); } if (!card->configured){ memset(&card->hw, 0, sizeof(sdlahw_t)); if (card->next){ memset(&card->next->hw, 0, sizeof(sdlahw_t)); } } wandev->critical = 0; return 0; } static void release_hw (sdla_t *card) { sdla_t *nxt_card; /* Check if next device exists */ if (card->next){ nxt_card = card->next; /* If next device is down then release resources */ if (nxt_card->wandev.state == WAN_UNCONFIGURED){ if (card->wandev.piggyback){ /* If this device is piggyback then use * information of the master device */ printk(KERN_INFO "%s: Piggyback shutting down\n",card->devname); sdla_down(&card->next->hw); free_irq(card->wandev.irq, card->next); card->configured = 0; card->next->configured = 0; card->wandev.piggyback = 0; }else{ /* Master device shutting down */ printk(KERN_INFO "%s: Master shutting down\n",card->devname); sdla_down(&card->hw); free_irq(card->wandev.irq, card); card->configured = 0; card->next->configured = 0; } }else{ printk(KERN_INFO "%s: Device still running\n", nxt_card->devname); card->configured = 1; } }else{ printk(KERN_INFO "%s: Master shutting down\n",card->devname); sdla_down(&card->hw); free_irq(card->wandev.irq, card); card->configured = 0; } } /*============================================================================ * Driver I/O control. * o verify arguments * o perform requested action * * This function is called when router handles one of the reserved user * IOCTLs. Note that 'arg' stil points to user address space. */ static int ioctl (wan_device_t* wandev, unsigned cmd, unsigned long arg) { sdla_t* card; int err; /* sanity checks */ if ((wandev == NULL) || (wandev->private == NULL)) return -EFAULT; if (wandev->state == WAN_UNCONFIGURED) return -ENODEV; card = wandev->private; if(card->hw.type != SDLA_S514){ disable_irq(card->hw.irq); } if (test_and_set_bit(0, (void*)&wandev->critical)) { if(card->hw.type != SDLA_S514){ enable_irq(card->hw.irq); } return -EAGAIN; } switch (cmd) { case WANPIPE_DUMP: err = ioctl_dump(wandev->private, (void*)arg); break; case WANPIPE_EXEC: err = ioctl_exec(wandev->private, (void*)arg); break; default: err = -EINVAL; } clear_bit(0, (void*)&wandev->critical); if(card->hw.type != SDLA_S514){ enable_irq(card->hw.irq); } return err; } /****** Driver IOCTL Handlers ***********************************************/ /*============================================================================ * Dump adapter memory to user buffer. * o verify request structure * o copy request structure to kernel data space * o verify length/offset * o verify user buffer * o copy adapter memory image to user buffer * * Note: when dumping memory, this routine switches current dual-port memory * vector, so care must be taken to avoid racing conditions. */ static int ioctl_dump (sdla_t* card, sdla_dump_t* u_dump) { sdla_dump_t dump; unsigned winsize; unsigned long oldvec; /* DPM window vector */ unsigned long flags; int err = 0; if(copy_from_user((void*)&dump, (void*)u_dump, sizeof(sdla_dump_t))) return -EFAULT; if ((dump.magic != WANPIPE_MAGIC) || (dump.offset + dump.length > card->hw.memory)) return -EINVAL; winsize = card->hw.dpmsize; save_flags(flags); cli(); /* >>> critical section start <<< */ if(card->hw.type != SDLA_S514) { oldvec = card->hw.vector; while (dump.length) { /* current offset */ unsigned pos = dump.offset % winsize; /* current vector */ unsigned long vec = dump.offset - pos; unsigned len = (dump.length > (winsize - pos)) ? (winsize - pos) : dump.length; /* relocate window */ if (sdla_mapmem(&card->hw, vec) != 0) { err = -EIO; break; } /* FIXME::: COPY TO KERNEL BUFFER FIRST ?? */ sti(); /* Not ideal but tough we have to do this */ if(copy_to_user((void *)dump.ptr, (u8 *)card->hw.dpmbase + pos, len)) return -EFAULT; cli(); dump.length -= len; dump.offset += len; (char*)dump.ptr += len; } sdla_mapmem(&card->hw, oldvec);/* restore DPM window position */ } else { /* FIXME::: COPY TO KERNEL BUFFER FIRST ?? */ sti(); /* Not ideal but tough we have to do this */ if(copy_to_user((void *)dump.ptr, (u8 *)card->hw.dpmbase + dump.offset, dump.length)) return -EFAULT; cli(); } restore_flags(flags); /* >>> critical section end <<< */ return err; } /*============================================================================ * Execute adapter firmware command. * o verify request structure * o copy request structure to kernel data space * o call protocol-specific 'exec' function */ static int ioctl_exec (sdla_t* card, sdla_exec_t* u_exec) { sdla_exec_t exec; if (card->exec == NULL) return -ENODEV; if(copy_from_user((void*)&exec, (void*)u_exec, sizeof(sdla_exec_t))) return -EFAULT; if ((exec.magic != WANPIPE_MAGIC) || (exec.cmd == NULL)) return -EINVAL; return card->exec(card, exec.cmd, exec.data); } /******* Miscellaneous ******************************************************/ /*============================================================================ * SDLA Interrupt Service Routine. * o acknowledge SDLA hardware interrupt. * o call protocol-specific interrupt service routine, if any. */ STATIC void sdla_isr (int irq, void* dev_id, struct pt_regs *regs) { #define card ((sdla_t*)dev_id) if(card->hw.type == SDLA_S514) { /* handle interrrupt on S514 */ u32 int_status; unsigned char CPU_no = card->hw.S514_cpu_no[0]; unsigned char card_found_for_IRQ; u8 IRQ_count = 0; for(;;) { read_S514_int_stat(&card->hw, &int_status); /* check if the interrupt is for this device */ if(!((unsigned char)int_status & (IRQ_CPU_A | IRQ_CPU_B))) return; /* if the IRQ is for both CPUs on the same adapter, */ /* then alter the interrupt status so as to handle */ /* one CPU at a time */ if(((unsigned char)int_status & (IRQ_CPU_A | IRQ_CPU_B)) == (IRQ_CPU_A | IRQ_CPU_B)) { int_status &= (CPU_no == S514_CPU_A) ? ~IRQ_CPU_B : ~IRQ_CPU_A; } card_found_for_IRQ = 0; /* check to see that the CPU number for this device */ /* corresponds to the interrupt status read */ switch (CPU_no) { case S514_CPU_A: if((unsigned char)int_status & IRQ_CPU_A) card_found_for_IRQ = 1; break; case S514_CPU_B: if((unsigned char)int_status & IRQ_CPU_B) card_found_for_IRQ = 1; break; } /* exit if the interrupt is for another CPU on the */ /* same IRQ */ if(!card_found_for_IRQ) return; if (!card || (card->wandev.state == WAN_UNCONFIGURED && !card->configured)){ printk(KERN_INFO "Received IRQ %d for CPU #%c\n", irq, CPU_no); printk(KERN_INFO "IRQ for unconfigured adapter\n"); S514_intack(&card->hw, int_status); return; } if (card->in_isr) { printk(KERN_INFO "%s: interrupt re-entrancy on IRQ %d\n", card->devname, card->wandev.irq); S514_intack(&card->hw, int_status); return; } S514_intack(&card->hw, int_status); if (card->isr) card->isr(card); /* handle a maximum of two interrupts (one for each */ /* CPU on the adapter) before returning */ if((++ IRQ_count) == 2) return; } } else { /* handle interrupt on S508 adapter */ if (!card || ((card->wandev.state == WAN_UNCONFIGURED) && !card->configured)) return; if (card->in_isr) { printk(KERN_INFO "%s: interrupt re-entrancy on IRQ %d!\n", card->devname, card->wandev.irq); return; } /* Use spin lock only for S508 */ #ifdef CONFIG_SMP spin_lock(&card->lock); #endif sdla_intack(&card->hw); if (card->isr) card->isr(card); #ifdef CONFIG_SMP spin_unlock(&card->lock); #endif } #undef card } /*============================================================================ * SDLA polling routine. * This routine simulates kernel thread to perform various housekeeping job. * * o for each configured device call its poll() routine * o if there is at least one active card, then reschedule itself once again */ STATIC void sdla_poll (void* data) { int i; for (i = 0; i < ncards; ++i) { sdla_t* card = &card_array[i]; if ((card->wandev.state != WAN_UNCONFIGURED) && card->poll && !card->wandev.critical) { card->poll(card); } } if (active) { MOD_INC_USE_COUNT; if (schedule_task(&sdla_tq) == 0) /* Surely not? */ MOD_DEC_USE_COUNT; } MOD_DEC_USE_COUNT; } /*============================================================================ * This routine is called by the protocol-specific modules when network * interface is being open. The only reason we need this, is because we * have to call MOD_INC_USE_COUNT, but cannot include 'module.h' where it's * defined more than once into the same kernel module. */ void wanpipe_open (sdla_t* card) { ++card->open_cnt; MOD_INC_USE_COUNT; } /*============================================================================ * This routine is called by the protocol-specific modules when network * interface is being closed. The only reason we need this, is because we * have to call MOD_DEC_USE_COUNT, but cannot include 'module.h' where it's * defined more than once into the same kernel module. */ void wanpipe_close (sdla_t* card) { --card->open_cnt; MOD_DEC_USE_COUNT; } /*============================================================================ * Set WAN device state. */ void wanpipe_set_state (sdla_t* card, int state) { unsigned long flags; save_flags(flags); cli(); if (card->wandev.state != state) { switch (state) { case WAN_CONNECTED: printk (KERN_INFO "%s: link connected!\n", card->devname); break; case WAN_CONNECTING: printk (KERN_INFO "%s: link connecting...\n", card->devname); break; case WAN_DISCONNECTED: printk (KERN_INFO "%s: link disconnected!\n", card->devname); break; } card->wandev.state = state; } card->state_tick = jiffies; restore_flags(flags); } /****** End *****************************************************************/