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authorStefan Raspl <raspl@linux.vnet.ibm.com>2013-01-21 02:30:22 +0000
committerDavid S. Miller <davem@davemloft.net>2013-01-21 13:51:15 -0500
commit819dc537fd7fcd799c5f7f85693d29e2635a84f9 (patch)
tree7b1a745bb135b02ebd64c2fb3718abb0b89fe82b /drivers
parent26e4b3340e5ac423497ee1a59d42b4ef81af4272 (diff)
qeth: Make s390dbf card entries persistent
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/s390/net/qeth_core_main.c90
1 files changed, 78 insertions, 12 deletions
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 1cccbad69cd4..3535b134bd31 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -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);