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qeth: serialize sysfs-triggered device configurations 

This patch serializes device removal and other sysfs-triggered
configurations by moving removal of sysfs-attributes to the beginning
of the remove functions. And it serializes online/offline setting
and discipline-switching (causing reestablishing of the net_device)
by making use of a new discipline mutex.

Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Frank Blaschka <frank.blaschka@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun 2010-07-22 23:15:05 +00:00 committed by David S. Miller
parent 75e0de1363
commit 9dc48ccc68
5 changed files with 22 additions and 7 deletions
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1
drivers/s390/net/qeth_core.h
View File

@ -747,6 +747,7 @@ struct qeth_card {
struct qdio_ssqd_desc ssqd;
debug_info_t *debug;
struct mutex conf_mutex;
struct mutex discipline_mutex;
};
struct qeth_card_list_struct {

11
drivers/s390/net/qeth_core_main.c
View File

@ -1084,6 +1084,7 @@ static int qeth_setup_card(struct qeth_card *card)
spin_lock_init(&card->ip_lock);
spin_lock_init(&card->thread_mask_lock);
mutex_init(&card->conf_mutex);
mutex_init(&card->discipline_mutex);
card->thread_start_mask = 0;
card->thread_allowed_mask = 0;
card->thread_running_mask = 0;
@ -4348,16 +4349,18 @@ static void qeth_core_remove_device(struct ccwgroup_device *gdev)
struct qeth_card *card = dev_get_drvdata(&gdev->dev);
QETH_DBF_TEXT(SETUP, 2, "removedv");
if (card->discipline.ccwgdriver) {
card->discipline.ccwgdriver->remove(gdev);
qeth_core_free_discipline(card);
}
if (card->info.type == QETH_CARD_TYPE_OSN) {
qeth_core_remove_osn_attributes(&gdev->dev);
} else {
qeth_core_remove_device_attributes(&gdev->dev);
}
if (card->discipline.ccwgdriver) {
card->discipline.ccwgdriver->remove(gdev);
qeth_core_free_discipline(card);
}
debug_unregister(card->debug);
write_lock_irqsave(&qeth_core_card_list.rwlock, flags);
list_del(&card->list);

4
drivers/s390/net/qeth_core_sys.c
View File

@ -411,7 +411,7 @@ static ssize_t qeth_dev_layer2_store(struct device *dev,
if (!card)
return -EINVAL;
mutex_lock(&card->conf_mutex);
mutex_lock(&card->discipline_mutex);
if (card->state != CARD_STATE_DOWN) {
rc = -EPERM;
goto out;
@ -446,7 +446,7 @@ static ssize_t qeth_dev_layer2_store(struct device *dev,
rc = card->discipline.ccwgdriver->probe(card->gdev);
out:
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return rc ? rc : count;
}

5
drivers/s390/net/qeth_l2_main.c
View File

@ -935,6 +935,7 @@ static int __qeth_l2_set_online(struct ccwgroup_device *gdev, int recovery_mode)
enum qeth_card_states recover_flag;
BUG_ON(!card);
mutex_lock(&card->discipline_mutex);
mutex_lock(&card->conf_mutex);
QETH_DBF_TEXT(SETUP, 2, "setonlin");
QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *));
@ -1012,6 +1013,7 @@ static int __qeth_l2_set_online(struct ccwgroup_device *gdev, int recovery_mode)
kobject_uevent(&gdev->dev.kobj, KOBJ_CHANGE);
out:
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return 0;
out_remove:
@ -1025,6 +1027,7 @@ out_remove:
else
card->state = CARD_STATE_DOWN;
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return rc;
}
@ -1040,6 +1043,7 @@ static int __qeth_l2_set_offline(struct ccwgroup_device *cgdev,
int rc = 0, rc2 = 0, rc3 = 0;
enum qeth_card_states recover_flag;
mutex_lock(&card->discipline_mutex);
mutex_lock(&card->conf_mutex);
QETH_DBF_TEXT(SETUP, 3, "setoffl");
QETH_DBF_HEX(SETUP, 3, &card, sizeof(void *));
@ -1060,6 +1064,7 @@ static int __qeth_l2_set_offline(struct ccwgroup_device *cgdev,
/* let user_space know that device is offline */
kobject_uevent(&cgdev->dev.kobj, KOBJ_CHANGE);
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return 0;
}

8
drivers/s390/net/qeth_l3_main.c
View File

@ -3354,6 +3354,8 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
{
struct qeth_card *card = dev_get_drvdata(&cgdev->dev);
qeth_l3_remove_device_attributes(&cgdev->dev);
qeth_set_allowed_threads(card, 0, 1);
wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
@ -3367,7 +3369,6 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
card->dev = NULL;
}
qeth_l3_remove_device_attributes(&cgdev->dev);
qeth_l3_clear_ip_list(card, 0, 0);
qeth_l3_clear_ipato_list(card);
return;
@ -3380,6 +3381,7 @@ static int __qeth_l3_set_online(struct ccwgroup_device *gdev, int recovery_mode)
enum qeth_card_states recover_flag;
BUG_ON(!card);
mutex_lock(&card->discipline_mutex);
mutex_lock(&card->conf_mutex);
QETH_DBF_TEXT(SETUP, 2, "setonlin");
QETH_DBF_HEX(SETUP, 2, &card, sizeof(void *));
@ -3461,6 +3463,7 @@ static int __qeth_l3_set_online(struct ccwgroup_device *gdev, int recovery_mode)
kobject_uevent(&gdev->dev.kobj, KOBJ_CHANGE);
out:
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return 0;
out_remove:
card->use_hard_stop = 1;
@ -3473,6 +3476,7 @@ out_remove:
else
card->state = CARD_STATE_DOWN;
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return rc;
}
@ -3488,6 +3492,7 @@ static int __qeth_l3_set_offline(struct ccwgroup_device *cgdev,
int rc = 0, rc2 = 0, rc3 = 0;
enum qeth_card_states recover_flag;
mutex_lock(&card->discipline_mutex);
mutex_lock(&card->conf_mutex);
QETH_DBF_TEXT(SETUP, 3, "setoffl");
QETH_DBF_HEX(SETUP, 3, &card, sizeof(void *));
@ -3508,6 +3513,7 @@ static int __qeth_l3_set_offline(struct ccwgroup_device *cgdev,
/* let user_space know that device is offline */
kobject_uevent(&cgdev->dev.kobj, KOBJ_CHANGE);
mutex_unlock(&card->conf_mutex);
mutex_unlock(&card->discipline_mutex);
return 0;
}