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[SCSI] zfcp: rework request ID management.

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Simplify request ID management and make sure that frequently used
functions are inlined. Also fix a memory leak in zfcp_adapter_enqueue()
which only gets hit in error handling.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Swen Schillig <swen@vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Heiko Carstens 2007-05-08 11:17:54 +02:00 committed by James Bottomley
parent 5f852be9e1
commit ca2d02c2f9
7 changed files with 59 additions and 89 deletions
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82
drivers/s390/scsi/zfcp_aux.c
View file

@ -118,97 +118,32 @@ _zfcp_hex_dump(char *addr, int count)
#define ZFCP_LOG_AREA ZFCP_LOG_AREA_FSF
static int zfcp_reqlist_init(struct zfcp_adapter *adapter)
static int zfcp_reqlist_alloc(struct zfcp_adapter *adapter)
{
int i;
int idx;
adapter->req_list = kcalloc(REQUEST_LIST_SIZE, sizeof(struct list_head),
GFP_KERNEL);
if (!adapter->req_list)
return -ENOMEM;
for (i=0; i<REQUEST_LIST_SIZE; i++)
INIT_LIST_HEAD(&adapter->req_list[i]);
for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
INIT_LIST_HEAD(&adapter->req_list[idx]);
return 0;
}
static void zfcp_reqlist_free(struct zfcp_adapter *adapter)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i;
for (i=0; i<REQUEST_LIST_SIZE; i++) {
if (list_empty(&adapter->req_list[i]))
continue;
list_for_each_entry_safe(request, tmp,
&adapter->req_list[i], list)
list_del(&request->list);
}
kfree(adapter->req_list);
}
void zfcp_reqlist_add(struct zfcp_adapter *adapter,
struct zfcp_fsf_req *fsf_req)
{
unsigned int i;
i = fsf_req->req_id % REQUEST_LIST_SIZE;
list_add_tail(&fsf_req->list, &adapter->req_list[i]);
}
void zfcp_reqlist_remove(struct zfcp_adapter *adapter, unsigned long req_id)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i, counter;
u64 dbg_tmp[2];
i = req_id % REQUEST_LIST_SIZE;
BUG_ON(list_empty(&adapter->req_list[i]));
counter = 0;
list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list) {
if (request->req_id == req_id) {
dbg_tmp[0] = (u64) atomic_read(&adapter->reqs_active);
dbg_tmp[1] = (u64) counter;
debug_event(adapter->erp_dbf, 4, (void *) dbg_tmp, 16);
list_del(&request->list);
break;
}
counter++;
}
}
struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *adapter,
unsigned long req_id)
{
struct zfcp_fsf_req *request, *tmp;
unsigned int i;
/* 0 is reserved as an invalid req_id */
if (req_id == 0)
return NULL;
i = req_id % REQUEST_LIST_SIZE;
list_for_each_entry_safe(request, tmp, &adapter->req_list[i], list)
if (request->req_id == req_id)
return request;
return NULL;
}
int zfcp_reqlist_isempty(struct zfcp_adapter *adapter)
{
unsigned int i;
unsigned int idx;
for (i=0; i<REQUEST_LIST_SIZE; i++)
if (!list_empty(&adapter->req_list[i]))
for (idx = 0; idx < REQUEST_LIST_SIZE; idx++)
if (!list_empty(&adapter->req_list[idx]))
return 0;
return 1;
}
@ -1106,7 +1041,7 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
/* initialize list of fsf requests */
spin_lock_init(&adapter->req_list_lock);
retval = zfcp_reqlist_init(adapter);
retval = zfcp_reqlist_alloc(adapter);
if (retval) {
ZFCP_LOG_INFO("request list initialization failed\n");
goto failed_low_mem_buffers;
@ -1167,6 +1102,7 @@ zfcp_adapter_enqueue(struct ccw_device *ccw_device)
zfcp_sysfs_adapter_remove_files(&adapter->ccw_device->dev);
sysfs_failed:
dev_set_drvdata(&ccw_device->dev, NULL);
zfcp_reqlist_free(adapter);
failed_low_mem_buffers:
zfcp_free_low_mem_buffers(adapter);
if (qdio_free(ccw_device) != 0)

36
drivers/s390/scsi/zfcp_def.h
View file

@ -1089,6 +1089,42 @@ extern void _zfcp_hex_dump(char *, int);
#define zfcp_get_busid_by_port(port) (zfcp_get_busid_by_adapter(port->adapter))
#define zfcp_get_busid_by_unit(unit) (zfcp_get_busid_by_port(unit->port))
/*
* Helper functions for request ID management.
*/
static inline int zfcp_reqlist_hash(unsigned long req_id)
{
return req_id % REQUEST_LIST_SIZE;
}
static inline void zfcp_reqlist_add(struct zfcp_adapter *adapter,
struct zfcp_fsf_req *fsf_req)
{
unsigned int idx;
idx = zfcp_reqlist_hash(fsf_req->req_id);
list_add_tail(&fsf_req->list, &adapter->req_list[idx]);
}
static inline void zfcp_reqlist_remove(struct zfcp_adapter *adapter,
struct zfcp_fsf_req *fsf_req)
{
list_del(&fsf_req->list);
}
static inline struct zfcp_fsf_req *
zfcp_reqlist_find(struct zfcp_adapter *adapter, unsigned long req_id)
{
struct zfcp_fsf_req *request;
unsigned int idx;
idx = zfcp_reqlist_hash(req_id);
list_for_each_entry(request, &adapter->req_list[idx], list)
if (request->req_id == req_id)
return request;
return NULL;
}
/*
* functions needed for reference/usage counting
*/

3
drivers/s390/scsi/zfcp_erp.c
View file

@ -847,8 +847,7 @@ zfcp_erp_strategy_check_fsfreq(struct zfcp_erp_action *erp_action)
if (erp_action->fsf_req) {
/* take lock to ensure that request is not deleted meanwhile */
spin_lock(&adapter->req_list_lock);
if (zfcp_reqlist_ismember(adapter,
erp_action->fsf_req->req_id)) {
if (zfcp_reqlist_find(adapter, erp_action->fsf_req->req_id)) {
/* fsf_req still exists */
debug_text_event(adapter->erp_dbf, 3, "a_ca_req");
debug_event(adapter->erp_dbf, 3, &erp_action->fsf_req,

4
drivers/s390/scsi/zfcp_ext.h
View file

@ -184,10 +184,6 @@ extern void zfcp_scsi_dbf_event_abort(const char *, struct zfcp_adapter *,
unsigned long);
extern void zfcp_scsi_dbf_event_devreset(const char *, u8, struct zfcp_unit *,
struct scsi_cmnd *);
extern void zfcp_reqlist_add(struct zfcp_adapter *, struct zfcp_fsf_req *);
extern void zfcp_reqlist_remove(struct zfcp_adapter *, unsigned long);
extern struct zfcp_fsf_req *zfcp_reqlist_ismember(struct zfcp_adapter *,
unsigned long);
extern int zfcp_reqlist_isempty(struct zfcp_adapter *);
#endif /* ZFCP_EXT_H */

2
drivers/s390/scsi/zfcp_fsf.c
View file

@ -4787,7 +4787,7 @@ static int zfcp_fsf_req_send(struct zfcp_fsf_req *fsf_req)
retval = -EIO;
del_timer(&fsf_req->timer);
spin_lock(&adapter->req_list_lock);
zfcp_reqlist_remove(adapter, fsf_req->req_id);
zfcp_reqlist_remove(adapter, fsf_req);
spin_unlock(&adapter->req_list_lock);
/* undo changes in request queue made for this request */
zfcp_qdio_zero_sbals(req_queue->buffer,

17
drivers/s390/scsi/zfcp_qdio.c
View file

@ -283,7 +283,7 @@ zfcp_qdio_request_handler(struct ccw_device *ccw_device,
}
/**
* zfcp_qdio_reqid_check - checks for valid reqids or unsolicited status
* zfcp_qdio_reqid_check - checks for valid reqids.
*/
static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
unsigned long req_id)
@ -294,14 +294,17 @@ static void zfcp_qdio_reqid_check(struct zfcp_adapter *adapter,
debug_long_event(adapter->erp_dbf, 4, req_id);
spin_lock_irqsave(&adapter->req_list_lock, flags);
fsf_req = zfcp_reqlist_ismember(adapter, req_id);
fsf_req = zfcp_reqlist_find(adapter, req_id);
if (!fsf_req) {
spin_unlock_irqrestore(&adapter->req_list_lock, flags);
panic("error: unknown request id (%ld).\n", req_id);
}
if (!fsf_req)
/*
* Unknown request means that we have potentially memory
* corruption and must stop the machine immediatly.
*/
panic("error: unknown request id (%ld) on adapter %s.\n",
req_id, zfcp_get_busid_by_adapter(adapter));
zfcp_reqlist_remove(adapter, req_id);
zfcp_reqlist_remove(adapter, fsf_req);
atomic_dec(&adapter->reqs_active);
spin_unlock_irqrestore(&adapter->req_list_lock, flags);

4
drivers/s390/scsi/zfcp_scsi.c
View file

@ -407,8 +407,8 @@ static int zfcp_scsi_eh_abort_handler(struct scsi_cmnd *scpnt)
/* Check whether corresponding fsf_req is still pending */
spin_lock(&adapter->req_list_lock);
fsf_req = zfcp_reqlist_ismember(adapter, (unsigned long)
scpnt->host_scribble);
fsf_req = zfcp_reqlist_find(adapter,
(unsigned long) scpnt->host_scribble);
spin_unlock(&adapter->req_list_lock);
if (!fsf_req) {
write_unlock_irqrestore(&adapter->abort_lock, flags);