[PATCH net-next] devlink: Remove duplicated registration check

[PATCH net-next] devlink: Remove duplicated registration check

[Leon Romanovsky]

From: Leon Romanovsky <leonro@nvidia.com>

Both registered flag and devlink pointer are set at the same time
and indicate the same thing - devlink/devlink_port are ready. Instead
of checking ->registered use devlink pointer as an indication.

Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
---
 include/net/devlink.h |  4 +---
 net/core/devlink.c    | 19 ++++++++++---------
 2 files changed, 11 insertions(+), 12 deletions(-)

diff --git a/include/net/devlink.h b/include/net/devlink.h
index 57b738b78073..e48a62320407 100644
--- a/include/net/devlink.h
+++ b/include/net/devlink.h
@@ -55,8 +55,7 @@ struct devlink {
 			    * port, sb, dpipe, resource, params, region, traps and more.
 			    */
 	u8 reload_failed:1,
-	   reload_enabled:1,
-	   registered:1;
+	   reload_enabled:1;
 	char priv[0] __aligned(NETDEV_ALIGN);
 };
 
@@ -158,7 +157,6 @@ struct devlink_port {
 	struct list_head region_list;
 	struct devlink *devlink;
 	unsigned int index;
-	bool registered;
 	spinlock_t type_lock; /* Protects type and type_dev
 			       * pointer consistency.
 			       */
diff --git a/net/core/devlink.c b/net/core/devlink.c
index 8fdd04f00fd7..b596a971b473 100644
--- a/net/core/devlink.c
+++ b/net/core/devlink.c
@@ -115,7 +115,7 @@ static void __devlink_net_set(struct devlink *devlink, struct net *net)
 
 void devlink_net_set(struct devlink *devlink, struct net *net)
 {
-	if (WARN_ON(devlink->registered))
+	if (WARN_ON(devlink->dev))
 		return;
 	__devlink_net_set(devlink, net);
 }
@@ -1043,7 +1043,7 @@ static void devlink_port_notify(struct devlink_port *devlink_port,
 	struct sk_buff *msg;
 	int err;
 
-	if (!devlink_port->registered)
+	if (!devlink_port->devlink)
 		return;
 
 	WARN_ON(cmd != DEVLINK_CMD_PORT_NEW && cmd != DEVLINK_CMD_PORT_DEL);
@@ -8817,8 +8817,8 @@ EXPORT_SYMBOL_GPL(devlink_alloc);
  */
 int devlink_register(struct devlink *devlink, struct device *dev)
 {
+	WARN_ON(devlink->dev);
 	devlink->dev = dev;
-	devlink->registered = true;
 	mutex_lock(&devlink_mutex);
 	list_add_tail(&devlink->list, &devlink_list);
 	devlink_notify(devlink, DEVLINK_CMD_NEW);
@@ -8960,9 +8960,10 @@ int devlink_port_register(struct devlink *devlink,
 		mutex_unlock(&devlink->lock);
 		return -EEXIST;
 	}
+
+	WARN_ON(devlink_port->devlink);
 	devlink_port->devlink = devlink;
 	devlink_port->index = port_index;
-	devlink_port->registered = true;
 	spin_lock_init(&devlink_port->type_lock);
 	INIT_LIST_HEAD(&devlink_port->reporter_list);
 	mutex_init(&devlink_port->reporters_lock);
@@ -9001,7 +9002,7 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port,
 				    enum devlink_port_type type,
 				    void *type_dev)
 {
-	if (WARN_ON(!devlink_port->registered))
+	if (WARN_ON(!devlink_port->devlink))
 		return;
 	devlink_port_type_warn_cancel(devlink_port);
 	spin_lock_bh(&devlink_port->type_lock);
@@ -9121,7 +9122,7 @@ void devlink_port_attrs_set(struct devlink_port *devlink_port,
 {
 	int ret;
 
-	if (WARN_ON(devlink_port->registered))
+	if (WARN_ON(devlink_port->devlink))
 		return;
 	devlink_port->attrs = *attrs;
 	ret = __devlink_port_attrs_set(devlink_port, attrs->flavour);
@@ -9145,7 +9146,7 @@ void devlink_port_attrs_pci_pf_set(struct devlink_port *devlink_port, u32 contro
 	struct devlink_port_attrs *attrs = &devlink_port->attrs;
 	int ret;
 
-	if (WARN_ON(devlink_port->registered))
+	if (WARN_ON(devlink_port->devlink))
 		return;
 	ret = __devlink_port_attrs_set(devlink_port,
 				       DEVLINK_PORT_FLAVOUR_PCI_PF);
@@ -9172,7 +9173,7 @@ void devlink_port_attrs_pci_vf_set(struct devlink_port *devlink_port, u32 contro
 	struct devlink_port_attrs *attrs = &devlink_port->attrs;
 	int ret;
 
-	if (WARN_ON(devlink_port->registered))
+	if (WARN_ON(devlink_port->devlink))
 		return;
 	ret = __devlink_port_attrs_set(devlink_port,
 				       DEVLINK_PORT_FLAVOUR_PCI_VF);
@@ -9200,7 +9201,7 @@ void devlink_port_attrs_pci_sf_set(struct devlink_port *devlink_port, u32 contro
 	struct devlink_port_attrs *attrs = &devlink_port->attrs;
 	int ret;
 
-	if (WARN_ON(devlink_port->registered))
+	if (WARN_ON(devlink_port->devlink))
 		return;
 	ret = __devlink_port_attrs_set(devlink_port,
 				       DEVLINK_PORT_FLAVOUR_PCI_SF);
-- 
2.31.1

Re: [PATCH net-next] devlink: Remove duplicated registration check

[Leon Romanovsky]

On Sun, Jul 25, 2021 at 03:24:41PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@nvidia.com>
> 
> Both registered flag and devlink pointer are set at the same time
> and indicate the same thing - devlink/devlink_port are ready. Instead
> of checking ->registered use devlink pointer as an indication.
> 
> Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
> ---
>  include/net/devlink.h |  4 +---
>  net/core/devlink.c    | 19 ++++++++++---------
>  2 files changed, 11 insertions(+), 12 deletions(-)

Sorry, please drop this patch for now, I'll need to resubmit it after will
fix completely bogus 6a5689ba0259 ("net/mlx5e: Fix possible non-initialized struct usage").

Thanks