From 9dc48ccc68b9dfc01c2beee2d4317fb3df3fdce9 Mon Sep 17 00:00:00 2001 From: Ursula Braun Date: Thu, 22 Jul 2010 23:15:05 +0000 Subject: [PATCH] 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 Signed-off-by: Frank Blaschka Signed-off-by: David S. Miller --- drivers/s390/net/qeth_core.h | 1 + drivers/s390/net/qeth_core_main.c | 11 +++++++---- drivers/s390/net/qeth_core_sys.c | 4 ++-- drivers/s390/net/qeth_l2_main.c | 5 +++++ drivers/s390/net/qeth_l3_main.c | 8 +++++++- 5 files changed, 22 insertions(+), 7 deletions(-) diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h index e7e99e6cad2..41ddf86c342 100644 --- a/drivers/s390/net/qeth_core.h +++ b/drivers/s390/net/qeth_core.h @@ -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 { diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c index 844935fbe6a..f33da45c35e 100644 --- a/drivers/s390/net/qeth_core_main.c +++ b/drivers/s390/net/qeth_core_main.c @@ -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); diff --git a/drivers/s390/net/qeth_core_sys.c b/drivers/s390/net/qeth_core_sys.c index 6b7fd88e8e4..42fa783a70c 100644 --- a/drivers/s390/net/qeth_core_sys.c +++ b/drivers/s390/net/qeth_core_sys.c @@ -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; } diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c index 32d07c2dcc6..5e66333a8be 100644 --- a/drivers/s390/net/qeth_l2_main.c +++ b/drivers/s390/net/qeth_l2_main.c @@ -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; } diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c index 15b5ca82bd2..e22ae248f61 100644 --- a/drivers/s390/net/qeth_l3_main.c +++ b/drivers/s390/net/qeth_l3_main.c @@ -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; }