netdev - [PATCH net-next 3/3] s390/qeth: clean up device

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Date:   Tue, 20 Jul 2021 08:38:49 +0200
From:   Julian Wiedmann <jwi@...ux.ibm.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     linux-netdev <netdev@...r.kernel.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Karsten Graul <kgraul@...ux.ibm.com>,
        Julian Wiedmann <jwi@...ux.ibm.com>
Subject: [PATCH net-next 3/3] s390/qeth: clean up device_type management

qeth uses three device_type structs - a generic one, and one for each
sub-driver (which is used for fixed-layer devices only). Instead of
exporting these device_types back&forth between the driver's modules,
make all the logic self-contained within the sub-drivers.

On disc->setup() they either install their own device_type, or add the
sysfs attributes that are missing in the generic device_type. Later on
disc->remove() these attributes are removed again from any device that
has the generic device_type.

Signed-off-by: Julian Wiedmann <jwi@...ux.ibm.com>
---
 drivers/s390/net/qeth_core.h      | 2 --
 drivers/s390/net/qeth_core_main.c | 4 +---
 drivers/s390/net/qeth_l2_main.c   | 8 +++++---
 drivers/s390/net/qeth_l3_main.c   | 7 ++++---
 4 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/drivers/s390/net/qeth_core.h b/drivers/s390/net/qeth_core.h
index 6819cc82fc00..c17031519900 100644
--- a/drivers/s390/net/qeth_core.h
+++ b/drivers/s390/net/qeth_core.h
@@ -767,7 +767,6 @@ enum qeth_threads {
 };
 
 struct qeth_discipline {
-	const struct device_type *devtype;
 	int (*setup) (struct ccwgroup_device *);
 	void (*remove) (struct ccwgroup_device *);
 	int (*set_online)(struct qeth_card *card, bool carrier_ok);
@@ -1040,7 +1039,6 @@ extern const struct qeth_discipline qeth_l2_discipline;
 extern const struct qeth_discipline qeth_l3_discipline;
 extern const struct ethtool_ops qeth_ethtool_ops;
 extern const struct attribute_group *qeth_dev_groups[];
-extern const struct device_type qeth_generic_devtype;
 
 const char *qeth_get_cardname_short(struct qeth_card *);
 int qeth_resize_buffer_pool(struct qeth_card *card, unsigned int count);
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 02a12f984ce2..7f486212c6aa 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -6286,10 +6286,9 @@ void qeth_remove_discipline(struct qeth_card *card)
 	card->discipline = NULL;
 }
 
-const struct device_type qeth_generic_devtype = {
+static const struct device_type qeth_generic_devtype = {
 	.name = "qeth_generic",
 };
-EXPORT_SYMBOL_GPL(qeth_generic_devtype);
 
 #define DBF_NAME_LEN	20
 
@@ -6474,7 +6473,6 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
 		if (rc)
 			goto err_setup_disc;
 
-		gdev->dev.type = card->discipline->devtype;
 		break;
 	}
 
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index c00cc6ea721f..7fe0f1aea3cb 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2056,10 +2056,12 @@ static int qeth_l2_probe_device(struct ccwgroup_device *gdev)
 	qeth_l2_vnicc_set_defaults(card);
 	mutex_init(&card->sbp_lock);
 
-	if (gdev->dev.type == &qeth_generic_devtype) {
+	if (gdev->dev.type) {
 		rc = device_add_groups(&gdev->dev, qeth_l2_attr_groups);
 		if (rc)
 			return rc;
+	} else {
+		gdev->dev.type = &qeth_l2_devtype;
 	}
 
 	INIT_WORK(&card->rx_mode_work, qeth_l2_rx_mode_work);
@@ -2070,8 +2072,9 @@ static void qeth_l2_remove_device(struct ccwgroup_device *gdev)
 {
 	struct qeth_card *card = dev_get_drvdata(&gdev->dev);
 
-	if (gdev->dev.type == &qeth_generic_devtype)
+	if (gdev->dev.type != &qeth_l2_devtype)
 		device_remove_groups(&gdev->dev, qeth_l2_attr_groups);
+
 	qeth_set_allowed_threads(card, 0, 1);
 	wait_event(card->wait_q, qeth_threads_running(card, 0xffffffff) == 0);
 
@@ -2191,7 +2194,6 @@ static int qeth_l2_control_event(struct qeth_card *card,
 }
 
 const struct qeth_discipline qeth_l2_discipline = {
-	.devtype = &qeth_l2_devtype,
 	.setup = qeth_l2_probe_device,
 	.remove = qeth_l2_remove_device,
 	.set_online = qeth_l2_set_online,
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index d308ff744a29..959ba62ccbb7 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -1939,12 +1939,14 @@ static int qeth_l3_probe_device(struct ccwgroup_device *gdev)
 	if (!card->cmd_wq)
 		return -ENOMEM;
 
-	if (gdev->dev.type == &qeth_generic_devtype) {
+	if (gdev->dev.type) {
 		rc = device_add_groups(&gdev->dev, qeth_l3_attr_groups);
 		if (rc) {
 			destroy_workqueue(card->cmd_wq);
 			return rc;
 		}
+	} else {
+		gdev->dev.type = &qeth_l3_devtype;
 	}
 
 	INIT_WORK(&card->rx_mode_work, qeth_l3_rx_mode_work);
@@ -1955,7 +1957,7 @@ static void qeth_l3_remove_device(struct ccwgroup_device *cgdev)
 {
 	struct qeth_card *card = dev_get_drvdata(&cgdev->dev);
 
-	if (cgdev->dev.type == &qeth_generic_devtype)
+	if (cgdev->dev.type != &qeth_l3_devtype)
 		device_remove_groups(&cgdev->dev, qeth_l3_attr_groups);
 
 	qeth_set_allowed_threads(card, 0, 1);
@@ -2064,7 +2066,6 @@ static int qeth_l3_control_event(struct qeth_card *card,
 }
 
 const struct qeth_discipline qeth_l3_discipline = {
-	.devtype = &qeth_l3_devtype,
 	.setup = qeth_l3_probe_device,
 	.remove = qeth_l3_remove_device,
 	.set_online = qeth_l3_set_online,
-- 
2.25.1