diff options
Diffstat (limited to 'drivers/scsi/libfc/fc_disc.c')
| -rw-r--r-- | drivers/scsi/libfc/fc_disc.c | 753 |
1 files changed, 753 insertions, 0 deletions
diff --git a/drivers/scsi/libfc/fc_disc.c b/drivers/scsi/libfc/fc_disc.c new file mode 100644 index 000000000..880a9068c --- /dev/null +++ b/drivers/scsi/libfc/fc_disc.c @@ -0,0 +1,753 @@ +/* + * Copyright(c) 2007 - 2008 Intel Corporation. All rights reserved. + * + * This program is free software; you can redistribute it and/or modify it + * under the terms and conditions of the GNU General Public License, + * version 2, as published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program; if not, write to the Free Software Foundation, Inc., + * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. + * + * Maintained at www.Open-FCoE.org + */ + +/* + * Target Discovery + * + * This block discovers all FC-4 remote ports, including FCP initiators. It + * also handles RSCN events and re-discovery if necessary. + */ + +/* + * DISC LOCKING + * + * The disc mutex is can be locked when acquiring rport locks, but may not + * be held when acquiring the lport lock. Refer to fc_lport.c for more + * details. + */ + +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/err.h> +#include <linux/export.h> +#include <asm/unaligned.h> + +#include <scsi/fc/fc_gs.h> + +#include <scsi/libfc.h> + +#include "fc_libfc.h" + +#define FC_DISC_RETRY_LIMIT 3 /* max retries */ +#define FC_DISC_RETRY_DELAY 500UL /* (msecs) delay */ + +static void fc_disc_gpn_ft_req(struct fc_disc *); +static void fc_disc_gpn_ft_resp(struct fc_seq *, struct fc_frame *, void *); +static void fc_disc_done(struct fc_disc *, enum fc_disc_event); +static void fc_disc_timeout(struct work_struct *); +static int fc_disc_single(struct fc_lport *, struct fc_disc_port *); +static void fc_disc_restart(struct fc_disc *); + +/** + * fc_disc_stop_rports() - Delete all the remote ports associated with the lport + * @disc: The discovery job to stop remote ports on + * + * Locking Note: This function expects that the lport mutex is locked before + * calling it. + */ +static void fc_disc_stop_rports(struct fc_disc *disc) +{ + struct fc_lport *lport; + struct fc_rport_priv *rdata; + + lport = fc_disc_lport(disc); + + mutex_lock(&disc->disc_mutex); + list_for_each_entry_rcu(rdata, &disc->rports, peers) + lport->tt.rport_logoff(rdata); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_recv_rscn_req() - Handle Registered State Change Notification (RSCN) + * @disc: The discovery object to which the RSCN applies + * @fp: The RSCN frame + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_recv_rscn_req(struct fc_disc *disc, struct fc_frame *fp) +{ + struct fc_lport *lport; + struct fc_els_rscn *rp; + struct fc_els_rscn_page *pp; + struct fc_seq_els_data rjt_data; + unsigned int len; + int redisc = 0; + enum fc_els_rscn_ev_qual ev_qual; + enum fc_els_rscn_addr_fmt fmt; + LIST_HEAD(disc_ports); + struct fc_disc_port *dp, *next; + + lport = fc_disc_lport(disc); + + FC_DISC_DBG(disc, "Received an RSCN event\n"); + + /* make sure the frame contains an RSCN message */ + rp = fc_frame_payload_get(fp, sizeof(*rp)); + if (!rp) + goto reject; + /* make sure the page length is as expected (4 bytes) */ + if (rp->rscn_page_len != sizeof(*pp)) + goto reject; + /* get the RSCN payload length */ + len = ntohs(rp->rscn_plen); + if (len < sizeof(*rp)) + goto reject; + /* make sure the frame contains the expected payload */ + rp = fc_frame_payload_get(fp, len); + if (!rp) + goto reject; + /* payload must be a multiple of the RSCN page size */ + len -= sizeof(*rp); + if (len % sizeof(*pp)) + goto reject; + + for (pp = (void *)(rp + 1); len > 0; len -= sizeof(*pp), pp++) { + ev_qual = pp->rscn_page_flags >> ELS_RSCN_EV_QUAL_BIT; + ev_qual &= ELS_RSCN_EV_QUAL_MASK; + fmt = pp->rscn_page_flags >> ELS_RSCN_ADDR_FMT_BIT; + fmt &= ELS_RSCN_ADDR_FMT_MASK; + /* + * if we get an address format other than port + * (area, domain, fabric), then do a full discovery + */ + switch (fmt) { + case ELS_ADDR_FMT_PORT: + FC_DISC_DBG(disc, "Port address format for port " + "(%6.6x)\n", ntoh24(pp->rscn_fid)); + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (!dp) { + redisc = 1; + break; + } + dp->lp = lport; + dp->port_id = ntoh24(pp->rscn_fid); + list_add_tail(&dp->peers, &disc_ports); + break; + case ELS_ADDR_FMT_AREA: + case ELS_ADDR_FMT_DOM: + case ELS_ADDR_FMT_FAB: + default: + FC_DISC_DBG(disc, "Address format is (%d)\n", fmt); + redisc = 1; + break; + } + } + lport->tt.seq_els_rsp_send(fp, ELS_LS_ACC, NULL); + + /* + * If not doing a complete rediscovery, do GPN_ID on + * the individual ports mentioned in the list. + * If any of these get an error, do a full rediscovery. + * In any case, go through the list and free the entries. + */ + list_for_each_entry_safe(dp, next, &disc_ports, peers) { + list_del(&dp->peers); + if (!redisc) + redisc = fc_disc_single(lport, dp); + kfree(dp); + } + if (redisc) { + FC_DISC_DBG(disc, "RSCN received: rediscovering\n"); + fc_disc_restart(disc); + } else { + FC_DISC_DBG(disc, "RSCN received: not rediscovering. " + "redisc %d state %d in_prog %d\n", + redisc, lport->state, disc->pending); + } + fc_frame_free(fp); + return; +reject: + FC_DISC_DBG(disc, "Received a bad RSCN frame\n"); + rjt_data.reason = ELS_RJT_LOGIC; + rjt_data.explan = ELS_EXPL_NONE; + lport->tt.seq_els_rsp_send(fp, ELS_LS_RJT, &rjt_data); + fc_frame_free(fp); +} + +/** + * fc_disc_recv_req() - Handle incoming requests + * @lport: The local port receiving the request + * @fp: The request frame + * + * Locking Note: This function is called from the EM and will lock + * the disc_mutex before calling the handler for the + * request. + */ +static void fc_disc_recv_req(struct fc_lport *lport, struct fc_frame *fp) +{ + u8 op; + struct fc_disc *disc = &lport->disc; + + op = fc_frame_payload_op(fp); + switch (op) { + case ELS_RSCN: + mutex_lock(&disc->disc_mutex); + fc_disc_recv_rscn_req(disc, fp); + mutex_unlock(&disc->disc_mutex); + break; + default: + FC_DISC_DBG(disc, "Received an unsupported request, " + "the opcode is (%x)\n", op); + fc_frame_free(fp); + break; + } +} + +/** + * fc_disc_restart() - Restart discovery + * @disc: The discovery object to be restarted + * + * Locking Note: This function expects that the disc mutex + * is already locked. + */ +static void fc_disc_restart(struct fc_disc *disc) +{ + if (!disc->disc_callback) + return; + + FC_DISC_DBG(disc, "Restarting discovery\n"); + + disc->requested = 1; + if (disc->pending) + return; + + /* + * Advance disc_id. This is an arbitrary non-zero number that will + * match the value in the fc_rport_priv after discovery for all + * freshly-discovered remote ports. Avoid wrapping to zero. + */ + disc->disc_id = (disc->disc_id + 2) | 1; + disc->retry_count = 0; + fc_disc_gpn_ft_req(disc); +} + +/** + * fc_disc_start() - Start discovery on a local port + * @lport: The local port to have discovery started on + * @disc_callback: Callback function to be called when discovery is complete + */ +static void fc_disc_start(void (*disc_callback)(struct fc_lport *, + enum fc_disc_event), + struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + /* + * At this point we may have a new disc job or an existing + * one. Either way, let's lock when we make changes to it + * and send the GPN_FT request. + */ + mutex_lock(&disc->disc_mutex); + disc->disc_callback = disc_callback; + fc_disc_restart(disc); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_done() - Discovery has been completed + * @disc: The discovery context + * @event: The discovery completion status + * + * Locking Note: This function expects that the disc mutex is locked before + * it is called. The discovery callback is then made with the lock released, + * and the lock is re-taken before returning from this function + */ +static void fc_disc_done(struct fc_disc *disc, enum fc_disc_event event) +{ + struct fc_lport *lport = fc_disc_lport(disc); + struct fc_rport_priv *rdata; + + FC_DISC_DBG(disc, "Discovery complete\n"); + + disc->pending = 0; + if (disc->requested) { + fc_disc_restart(disc); + return; + } + + /* + * Go through all remote ports. If they were found in the latest + * discovery, reverify or log them in. Otherwise, log them out. + * Skip ports which were never discovered. These are the dNS port + * and ports which were created by PLOGI. + */ + list_for_each_entry_rcu(rdata, &disc->rports, peers) { + if (!rdata->disc_id) + continue; + if (rdata->disc_id == disc->disc_id) + lport->tt.rport_login(rdata); + else + lport->tt.rport_logoff(rdata); + } + + mutex_unlock(&disc->disc_mutex); + disc->disc_callback(lport, event); + mutex_lock(&disc->disc_mutex); +} + +/** + * fc_disc_error() - Handle error on dNS request + * @disc: The discovery context + * @fp: The error code encoded as a frame pointer + */ +static void fc_disc_error(struct fc_disc *disc, struct fc_frame *fp) +{ + struct fc_lport *lport = fc_disc_lport(disc); + unsigned long delay = 0; + + FC_DISC_DBG(disc, "Error %ld, retries %d/%d\n", + PTR_ERR(fp), disc->retry_count, + FC_DISC_RETRY_LIMIT); + + if (!fp || PTR_ERR(fp) == -FC_EX_TIMEOUT) { + /* + * Memory allocation failure, or the exchange timed out, + * retry after delay. + */ + if (disc->retry_count < FC_DISC_RETRY_LIMIT) { + /* go ahead and retry */ + if (!fp) + delay = msecs_to_jiffies(FC_DISC_RETRY_DELAY); + else { + delay = msecs_to_jiffies(lport->e_d_tov); + + /* timeout faster first time */ + if (!disc->retry_count) + delay /= 4; + } + disc->retry_count++; + schedule_delayed_work(&disc->disc_work, delay); + } else + fc_disc_done(disc, DISC_EV_FAILED); + } else if (PTR_ERR(fp) == -FC_EX_CLOSED) { + /* + * if discovery fails due to lport reset, clear + * pending flag so that subsequent discovery can + * continue + */ + disc->pending = 0; + } +} + +/** + * fc_disc_gpn_ft_req() - Send Get Port Names by FC-4 type (GPN_FT) request + * @lport: The discovery context + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static void fc_disc_gpn_ft_req(struct fc_disc *disc) +{ + struct fc_frame *fp; + struct fc_lport *lport = fc_disc_lport(disc); + + WARN_ON(!fc_lport_test_ready(lport)); + + disc->pending = 1; + disc->requested = 0; + + disc->buf_len = 0; + disc->seq_count = 0; + fp = fc_frame_alloc(lport, + sizeof(struct fc_ct_hdr) + + sizeof(struct fc_ns_gid_ft)); + if (!fp) + goto err; + + if (lport->tt.elsct_send(lport, 0, fp, + FC_NS_GPN_FT, + fc_disc_gpn_ft_resp, + disc, 3 * lport->r_a_tov)) + return; +err: + fc_disc_error(disc, NULL); +} + +/** + * fc_disc_gpn_ft_parse() - Parse the body of the dNS GPN_FT response. + * @lport: The local port the GPN_FT was received on + * @buf: The GPN_FT response buffer + * @len: The size of response buffer + * + * Goes through the list of IDs and names resulting from a request. + */ +static int fc_disc_gpn_ft_parse(struct fc_disc *disc, void *buf, size_t len) +{ + struct fc_lport *lport; + struct fc_gpn_ft_resp *np; + char *bp; + size_t plen; + size_t tlen; + int error = 0; + struct fc_rport_identifiers ids; + struct fc_rport_priv *rdata; + + lport = fc_disc_lport(disc); + disc->seq_count++; + + /* + * Handle partial name record left over from previous call. + */ + bp = buf; + plen = len; + np = (struct fc_gpn_ft_resp *)bp; + tlen = disc->buf_len; + disc->buf_len = 0; + if (tlen) { + WARN_ON(tlen >= sizeof(*np)); + plen = sizeof(*np) - tlen; + WARN_ON(plen <= 0); + WARN_ON(plen >= sizeof(*np)); + if (plen > len) + plen = len; + np = &disc->partial_buf; + memcpy((char *)np + tlen, bp, plen); + + /* + * Set bp so that the loop below will advance it to the + * first valid full name element. + */ + bp -= tlen; + len += tlen; + plen += tlen; + disc->buf_len = (unsigned char) plen; + if (plen == sizeof(*np)) + disc->buf_len = 0; + } + + /* + * Handle full name records, including the one filled from above. + * Normally, np == bp and plen == len, but from the partial case above, + * bp, len describe the overall buffer, and np, plen describe the + * partial buffer, which if would usually be full now. + * After the first time through the loop, things return to "normal". + */ + while (plen >= sizeof(*np)) { + ids.port_id = ntoh24(np->fp_fid); + ids.port_name = ntohll(np->fp_wwpn); + + if (ids.port_id != lport->port_id && + ids.port_name != lport->wwpn) { + rdata = lport->tt.rport_create(lport, ids.port_id); + if (rdata) { + rdata->ids.port_name = ids.port_name; + rdata->disc_id = disc->disc_id; + } else { + printk(KERN_WARNING "libfc: Failed to allocate " + "memory for the newly discovered port " + "(%6.6x)\n", ids.port_id); + error = -ENOMEM; + } + } + + if (np->fp_flags & FC_NS_FID_LAST) { + fc_disc_done(disc, DISC_EV_SUCCESS); + len = 0; + break; + } + len -= sizeof(*np); + bp += sizeof(*np); + np = (struct fc_gpn_ft_resp *)bp; + plen = len; + } + + /* + * Save any partial record at the end of the buffer for next time. + */ + if (error == 0 && len > 0 && len < sizeof(*np)) { + if (np != &disc->partial_buf) { + FC_DISC_DBG(disc, "Partial buffer remains " + "for discovery\n"); + memcpy(&disc->partial_buf, np, len); + } + disc->buf_len = (unsigned char) len; + } + return error; +} + +/** + * fc_disc_timeout() - Handler for discovery timeouts + * @work: Structure holding discovery context that needs to retry discovery + */ +static void fc_disc_timeout(struct work_struct *work) +{ + struct fc_disc *disc = container_of(work, + struct fc_disc, + disc_work.work); + mutex_lock(&disc->disc_mutex); + fc_disc_gpn_ft_req(disc); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_gpn_ft_resp() - Handle a response frame from Get Port Names (GPN_FT) + * @sp: The sequence that the GPN_FT response was received on + * @fp: The GPN_FT response frame + * @lp_arg: The discovery context + * + * Locking Note: This function is called without disc mutex held, and + * should do all its processing with the mutex held + */ +static void fc_disc_gpn_ft_resp(struct fc_seq *sp, struct fc_frame *fp, + void *disc_arg) +{ + struct fc_disc *disc = disc_arg; + struct fc_ct_hdr *cp; + struct fc_frame_header *fh; + enum fc_disc_event event = DISC_EV_NONE; + unsigned int seq_cnt; + unsigned int len; + int error = 0; + + mutex_lock(&disc->disc_mutex); + FC_DISC_DBG(disc, "Received a GPN_FT response\n"); + + if (IS_ERR(fp)) { + fc_disc_error(disc, fp); + mutex_unlock(&disc->disc_mutex); + return; + } + + WARN_ON(!fc_frame_is_linear(fp)); /* buffer must be contiguous */ + fh = fc_frame_header_get(fp); + len = fr_len(fp) - sizeof(*fh); + seq_cnt = ntohs(fh->fh_seq_cnt); + if (fr_sof(fp) == FC_SOF_I3 && seq_cnt == 0 && disc->seq_count == 0) { + cp = fc_frame_payload_get(fp, sizeof(*cp)); + if (!cp) { + FC_DISC_DBG(disc, "GPN_FT response too short, len %d\n", + fr_len(fp)); + event = DISC_EV_FAILED; + } else if (ntohs(cp->ct_cmd) == FC_FS_ACC) { + + /* Accepted, parse the response. */ + len -= sizeof(*cp); + error = fc_disc_gpn_ft_parse(disc, cp + 1, len); + } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { + FC_DISC_DBG(disc, "GPN_FT rejected reason %x exp %x " + "(check zoning)\n", cp->ct_reason, + cp->ct_explan); + event = DISC_EV_FAILED; + if (cp->ct_reason == FC_FS_RJT_UNABL && + cp->ct_explan == FC_FS_EXP_FTNR) + event = DISC_EV_SUCCESS; + } else { + FC_DISC_DBG(disc, "GPN_FT unexpected response code " + "%x\n", ntohs(cp->ct_cmd)); + event = DISC_EV_FAILED; + } + } else if (fr_sof(fp) == FC_SOF_N3 && seq_cnt == disc->seq_count) { + error = fc_disc_gpn_ft_parse(disc, fh + 1, len); + } else { + FC_DISC_DBG(disc, "GPN_FT unexpected frame - out of sequence? " + "seq_cnt %x expected %x sof %x eof %x\n", + seq_cnt, disc->seq_count, fr_sof(fp), fr_eof(fp)); + event = DISC_EV_FAILED; + } + if (error) + fc_disc_error(disc, fp); + else if (event != DISC_EV_NONE) + fc_disc_done(disc, event); + fc_frame_free(fp); + mutex_unlock(&disc->disc_mutex); +} + +/** + * fc_disc_gpn_id_resp() - Handle a response frame from Get Port Names (GPN_ID) + * @sp: The sequence the GPN_ID is on + * @fp: The response frame + * @rdata_arg: The remote port that sent the GPN_ID response + * + * Locking Note: This function is called without disc mutex held. + */ +static void fc_disc_gpn_id_resp(struct fc_seq *sp, struct fc_frame *fp, + void *rdata_arg) +{ + struct fc_rport_priv *rdata = rdata_arg; + struct fc_rport_priv *new_rdata; + struct fc_lport *lport; + struct fc_disc *disc; + struct fc_ct_hdr *cp; + struct fc_ns_gid_pn *pn; + u64 port_name; + + lport = rdata->local_port; + disc = &lport->disc; + + mutex_lock(&disc->disc_mutex); + if (PTR_ERR(fp) == -FC_EX_CLOSED) + goto out; + if (IS_ERR(fp)) + goto redisc; + + cp = fc_frame_payload_get(fp, sizeof(*cp)); + if (!cp) + goto redisc; + if (ntohs(cp->ct_cmd) == FC_FS_ACC) { + if (fr_len(fp) < sizeof(struct fc_frame_header) + + sizeof(*cp) + sizeof(*pn)) + goto redisc; + pn = (struct fc_ns_gid_pn *)(cp + 1); + port_name = get_unaligned_be64(&pn->fn_wwpn); + if (rdata->ids.port_name == -1) + rdata->ids.port_name = port_name; + else if (rdata->ids.port_name != port_name) { + FC_DISC_DBG(disc, "GPN_ID accepted. WWPN changed. " + "Port-id %6.6x wwpn %16.16llx\n", + rdata->ids.port_id, port_name); + lport->tt.rport_logoff(rdata); + + new_rdata = lport->tt.rport_create(lport, + rdata->ids.port_id); + if (new_rdata) { + new_rdata->disc_id = disc->disc_id; + lport->tt.rport_login(new_rdata); + } + goto out; + } + rdata->disc_id = disc->disc_id; + lport->tt.rport_login(rdata); + } else if (ntohs(cp->ct_cmd) == FC_FS_RJT) { + FC_DISC_DBG(disc, "GPN_ID rejected reason %x exp %x\n", + cp->ct_reason, cp->ct_explan); + lport->tt.rport_logoff(rdata); + } else { + FC_DISC_DBG(disc, "GPN_ID unexpected response code %x\n", + ntohs(cp->ct_cmd)); +redisc: + fc_disc_restart(disc); + } +out: + mutex_unlock(&disc->disc_mutex); + kref_put(&rdata->kref, lport->tt.rport_destroy); +} + +/** + * fc_disc_gpn_id_req() - Send Get Port Names by ID (GPN_ID) request + * @lport: The local port to initiate discovery on + * @rdata: remote port private data + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + * On failure, an error code is returned. + */ +static int fc_disc_gpn_id_req(struct fc_lport *lport, + struct fc_rport_priv *rdata) +{ + struct fc_frame *fp; + + fp = fc_frame_alloc(lport, sizeof(struct fc_ct_hdr) + + sizeof(struct fc_ns_fid)); + if (!fp) + return -ENOMEM; + if (!lport->tt.elsct_send(lport, rdata->ids.port_id, fp, FC_NS_GPN_ID, + fc_disc_gpn_id_resp, rdata, + 3 * lport->r_a_tov)) + return -ENOMEM; + kref_get(&rdata->kref); + return 0; +} + +/** + * fc_disc_single() - Discover the directory information for a single target + * @lport: The local port the remote port is associated with + * @dp: The port to rediscover + * + * Locking Note: This function expects that the disc_mutex is locked + * before it is called. + */ +static int fc_disc_single(struct fc_lport *lport, struct fc_disc_port *dp) +{ + struct fc_rport_priv *rdata; + + rdata = lport->tt.rport_create(lport, dp->port_id); + if (!rdata) + return -ENOMEM; + rdata->disc_id = 0; + return fc_disc_gpn_id_req(lport, rdata); +} + +/** + * fc_disc_stop() - Stop discovery for a given lport + * @lport: The local port that discovery should stop on + */ +static void fc_disc_stop(struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + if (disc->pending) + cancel_delayed_work_sync(&disc->disc_work); + fc_disc_stop_rports(disc); +} + +/** + * fc_disc_stop_final() - Stop discovery for a given lport + * @lport: The lport that discovery should stop on + * + * This function will block until discovery has been + * completely stopped and all rports have been deleted. + */ +static void fc_disc_stop_final(struct fc_lport *lport) +{ + fc_disc_stop(lport); + lport->tt.rport_flush_queue(); +} + +/** + * fc_disc_config() - Configure the discovery layer for a local port + * @lport: The local port that needs the discovery layer to be configured + * @priv: Private data structre for users of the discovery layer + */ +void fc_disc_config(struct fc_lport *lport, void *priv) +{ + struct fc_disc *disc = &lport->disc; + + if (!lport->tt.disc_start) + lport->tt.disc_start = fc_disc_start; + + if (!lport->tt.disc_stop) + lport->tt.disc_stop = fc_disc_stop; + + if (!lport->tt.disc_stop_final) + lport->tt.disc_stop_final = fc_disc_stop_final; + + if (!lport->tt.disc_recv_req) + lport->tt.disc_recv_req = fc_disc_recv_req; + + disc = &lport->disc; + + disc->priv = priv; +} +EXPORT_SYMBOL(fc_disc_config); + +/** + * fc_disc_init() - Initialize the discovery layer for a local port + * @lport: The local port that needs the discovery layer to be initialized + */ +void fc_disc_init(struct fc_lport *lport) +{ + struct fc_disc *disc = &lport->disc; + + INIT_DELAYED_WORK(&disc->disc_work, fc_disc_timeout); + mutex_init(&disc->disc_mutex); + INIT_LIST_HEAD(&disc->rports); +} +EXPORT_SYMBOL(fc_disc_init); |