[PATCH net-next 4/8] s390/qeth: remove card list

Julian Wiedmann
2018-11-08T14:06:18Z

Re-implement the card-by-RDEV lookup by using device model concepts, and
remove the now redundant list of all qeth card instances in the system.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
---
drivers/s390/net/qeth_core.h | 8 +-------
drivers/s390/net/qeth_core_main.c | 25 +++++++++++++++----------
drivers/s390/net/qeth_l2_main.c | 35 ++++++++---------------------------
3 files changed, 24 insertions(+), 44 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index afe3662a4ad5..0ee026947f20 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -774,7 +774,6 @@ struct qeth_switch_info {
#define QETH_NAPI_WEIGHT NAPI_POLL_WEIGHT

struct qeth_card {
- struct list_head list;
enum qeth_card_states state;
spinlock_t lock;
struct ccwgroup_device *gdev;
@@ -826,11 +825,6 @@ struct qeth_card {
struct work_struct close_dev_work;
};

-struct qeth_card_list_struct {
- struct list_head list;
- rwlock_t rwlock;
-};
-
struct qeth_trap_id {
__u16 lparnr;
char vmname[8];
@@ -977,11 +971,11 @@ int qeth_core_load_discipline(struct qeth_card *, enum qeth_discipline_id);
void qeth_core_free_discipline(struct qeth_card *);

/* exports for qeth discipline device drivers */
-extern struct qeth_card_list_struct qeth_core_card_list;
extern struct kmem_cache *qeth_core_header_cache;
extern struct qeth_dbf_info qeth_dbf[QETH_DBF_INFOS];

struct net_device *qeth_clone_netdev(struct net_device *orig);
+struct qeth_card *qeth_get_card_by_busid(char *bus_id);
void qeth_set_recovery_task(struct qeth_card *);
void qeth_clear_recovery_task(struct qeth_card *);
void qeth_set_allowed_threads(struct qeth_card *, unsigned long , int);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 2568ddc1bbc3..508bad2dbd0b 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -54,8 +54,6 @@ struct qeth_dbf_info qeth_dbf[QETH_DBF_INFOS] = {
};
EXPORT_SYMBOL_GPL(qeth_dbf);

-struct qeth_card_list_struct qeth_core_card_list;
-EXPORT_SYMBOL_GPL(qeth_core_card_list);
struct kmem_cache *qeth_core_header_cache;
EXPORT_SYMBOL_GPL(qeth_core_header_cache);
static struct kmem_cache *qeth_qdio_outbuf_cache;
@@ -5806,9 +5804,6 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
break;
}

- write_lock_irq(&qeth_core_card_list.rwlock);
- list_add_tail(&card->list, &qeth_core_card_list.list);
- write_unlock_irq(&qeth_core_card_list.rwlock);
return 0;

err_disc:
@@ -5833,9 +5828,6 @@ static void qeth_core_remove_device(struct ccwgroup_device *gdev)
qeth_core_free_discipline(card);
}

- write_lock_irq(&qeth_core_card_list.rwlock);
- list_del(&card->list);
- write_unlock_irq(&qeth_core_card_list.rwlock);
free_netdev(card->dev);
qeth_core_free_card(card);
put_device(&gdev->dev);
@@ -5950,6 +5942,21 @@ static struct ccwgroup_driver qeth_core_ccwgroup_driver = {
.restore = qeth_core_restore,
};

+struct qeth_card *qeth_get_card_by_busid(char *bus_id)
+{
+ struct ccwgroup_device *gdev;
+ struct qeth_card *card;
+
+ gdev = get_ccwgroupdev_by_busid(&qeth_core_ccwgroup_driver, bus_id);
+ if (!gdev)
+ return NULL;
+
+ card = dev_get_drvdata(&gdev->dev);
+ put_device(&gdev->dev);
+ return card;
+}
+EXPORT_SYMBOL_GPL(qeth_get_card_by_busid);
+
int qeth_do_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
struct qeth_card *card = dev->ml_priv;
@@ -6688,8 +6695,6 @@ static int __init qeth_core_init(void)
int rc;

pr_info("loading core functions\n");
- INIT_LIST_HEAD(&qeth_core_card_list.list);
- rwlock_init(&qeth_core_card_list.rwlock);

qeth_wq = create_singlethread_workqueue("qeth_wq");
if (!qeth_wq) {
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index 8d3601891c62..2836231c1c5d 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -36,28 +36,6 @@ static void qeth_l2_vnicc_init(struct qeth_card *card);
static bool qeth_l2_vnicc_recover_timeout(struct qeth_card *card, u32 vnicc,
u32 *timeout);

-static struct net_device *qeth_l2_netdev_by_devno(unsigned char *read_dev_no)
-{
- struct qeth_card *card;
- struct net_device *ndev;
- __u16 temp_dev_no;
- unsigned long flags;
- struct ccw_dev_id read_devid;
-
- ndev = NULL;
- memcpy(&temp_dev_no, read_dev_no, 2);
- read_lock_irqsave(&qeth_core_card_list.rwlock, flags);
- list_for_each_entry(card, &qeth_core_card_list.list, list) {
- ccw_device_get_id(CARD_RDEV(card), &read_devid);
- if (read_devid.devno == temp_dev_no) {
- ndev = card->dev;
- break;
- }
- }
- read_unlock_irqrestore(&qeth_core_card_list.rwlock, flags);
- return ndev;
-}
-
static int qeth_setdelmac_makerc(struct qeth_card *card, int retcode)
{
int rc;
@@ -1286,13 +1264,16 @@ int qeth_osn_register(unsigned char *read_dev_no, struct net_device **dev,
int (*data_cb)(struct sk_buff *))
{
struct qeth_card *card;
+ char bus_id[16];
+ u16 devno;

- *dev = qeth_l2_netdev_by_devno(read_dev_no);
- if (*dev == NULL)
- return -ENODEV;
- card = (*dev)->ml_priv;
- if (!card)
+ memcpy(&devno, read_dev_no, 2);
+ sprintf(bus_id, "0.0.%04x", devno);
+ card = qeth_get_card_by_busid(bus_id);
+ if (!card || !IS_OSN(card))
return -ENODEV;
+ *dev = card->dev;
+
QETH_CARD_TEXT(card, 2, "osnreg");
if ((assist_cb == NULL) || (data_cb == NULL))
return -EINVAL;
--
2.16.4