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qeth: Make s390dbf card entries persistent

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As of now, s390dbf entries for the cards are discarded as soon as the
device is removed. However, this will also bar us of all chances of
getting valuable debug information after a device has been removed.
This patch will keep the s390dbf entries around until the qeth module
is removed.

Signed-off-by: Stefan Raspl <raspl@linux.vnet.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefan Raspl 2013-01-21 02:30:22 +00:00 committed by David S. Miller
parent 26e4b3340e
commit 819dc537fd
1 changed files with 78 additions and 12 deletions
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90
drivers/s390/net/qeth_core_main.c
View file

@ -5122,13 +5122,81 @@ static const struct device_type qeth_osn_devtype = {
.groups = qeth_osn_attr_groups,
};
#define DBF_NAME_LEN 20
struct qeth_dbf_entry {
char dbf_name[DBF_NAME_LEN];
debug_info_t *dbf_info;
struct list_head dbf_list;
};
static LIST_HEAD(qeth_dbf_list);
static DEFINE_MUTEX(qeth_dbf_list_mutex);
static debug_info_t *qeth_get_dbf_entry(char *name)
{
struct qeth_dbf_entry *entry;
debug_info_t *rc = NULL;
mutex_lock(&qeth_dbf_list_mutex);
list_for_each_entry(entry, &qeth_dbf_list, dbf_list) {
if (strcmp(entry->dbf_name, name) == 0) {
rc = entry->dbf_info;
break;
}
}
mutex_unlock(&qeth_dbf_list_mutex);
return rc;
}
static int qeth_add_dbf_entry(struct qeth_card *card, char *name)
{
struct qeth_dbf_entry *new_entry;
card->debug = debug_register(name, 2, 1, 8);
if (!card->debug) {
QETH_DBF_TEXT_(SETUP, 2, "%s", "qcdbf");
goto err;
}
if (debug_register_view(card->debug, &debug_hex_ascii_view))
goto err_dbg;
new_entry = kzalloc(sizeof(struct qeth_dbf_entry), GFP_KERNEL);
if (!new_entry)
goto err_dbg;
strncpy(new_entry->dbf_name, name, DBF_NAME_LEN);
new_entry->dbf_info = card->debug;
mutex_lock(&qeth_dbf_list_mutex);
list_add(&new_entry->dbf_list, &qeth_dbf_list);
mutex_unlock(&qeth_dbf_list_mutex);
return 0;
err_dbg:
debug_unregister(card->debug);
err:
return -ENOMEM;
}
static void qeth_clear_dbf_list(void)
{
struct qeth_dbf_entry *entry, *tmp;
mutex_lock(&qeth_dbf_list_mutex);
list_for_each_entry_safe(entry, tmp, &qeth_dbf_list, dbf_list) {
list_del(&entry->dbf_list);
debug_unregister(entry->dbf_info);
kfree(entry);
}
mutex_unlock(&qeth_dbf_list_mutex);
}
static int qeth_core_probe_device(struct ccwgroup_device *gdev)
{
struct qeth_card *card;
struct device *dev;
int rc;
unsigned long flags;
char dbf_name[20];
char dbf_name[DBF_NAME_LEN];
QETH_DBF_TEXT(SETUP, 2, "probedev");
@ -5147,13 +5215,12 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
snprintf(dbf_name, sizeof(dbf_name), "qeth_card_%s",
dev_name(&gdev->dev));
card->debug = debug_register(dbf_name, 2, 1, 8);
card->debug = qeth_get_dbf_entry(dbf_name);
if (!card->debug) {
QETH_DBF_TEXT_(SETUP, 2, "%s", "qcdbf");
rc = -ENOMEM;
goto err_card;
rc = qeth_add_dbf_entry(card, dbf_name);
if (rc)
goto err_card;
}
debug_register_view(card->debug, &debug_hex_ascii_view);
card->read.ccwdev = gdev->cdev[0];
card->write.ccwdev = gdev->cdev[1];
@ -5167,12 +5234,12 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
rc = qeth_determine_card_type(card);
if (rc) {
QETH_DBF_TEXT_(SETUP, 2, "3err%d", rc);
goto err_dbf;
goto err_card;
}
rc = qeth_setup_card(card);
if (rc) {
QETH_DBF_TEXT_(SETUP, 2, "2err%d", rc);
goto err_dbf;
goto err_card;
}
if (card->info.type == QETH_CARD_TYPE_OSN)
@ -5185,7 +5252,7 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
case QETH_CARD_TYPE_OSM:
rc = qeth_core_load_discipline(card, QETH_DISCIPLINE_LAYER2);
if (rc)
goto err_dbf;
goto err_card;
rc = card->discipline->setup(card->gdev);
if (rc)
goto err_disc;
@ -5204,8 +5271,6 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
err_disc:
qeth_core_free_discipline(card);
err_dbf:
debug_unregister(card->debug);
err_card:
qeth_core_free_card(card);
err_dev:
@ -5225,7 +5290,6 @@ static void qeth_core_remove_device(struct ccwgroup_device *gdev)
qeth_core_free_discipline(card);
}
debug_unregister(card->debug);
write_lock_irqsave(&qeth_core_card_list.rwlock, flags);
list_del(&card->list);
write_unlock_irqrestore(&qeth_core_card_list.rwlock, flags);
@ -5579,6 +5643,7 @@ static int __init qeth_core_init(void)
pr_info("loading core functions\n");
INIT_LIST_HEAD(&qeth_core_card_list.list);
INIT_LIST_HEAD(&qeth_dbf_list);
rwlock_init(&qeth_core_card_list.rwlock);
mutex_init(&qeth_mod_mutex);
@ -5630,6 +5695,7 @@ out_err:
static void __exit qeth_core_exit(void)
{
qeth_clear_dbf_list();
destroy_workqueue(qeth_wq);
ccwgroup_driver_unregister(&qeth_core_ccwgroup_driver);
ccw_driver_unregister(&qeth_ccw_driver);