linux-kernel - Re: [PATCH net v3 2/3] dpll: fix register pin with unregistered parent pin

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Date: Tue, 16 Jan 2024 08:42:09 +0100
From: Jiri Pirko <jiri@...nulli.us>
To: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Cc: netdev@...r.kernel.org, vadim.fedorenko@...ux.dev, davem@...emloft.net,
	milena.olech@...el.com, linux-kernel@...r.kernel.org,
	pabeni@...hat.com, kuba@...nel.org, mschmidt@...hat.com,
	Jan Glaza <jan.glaza@...el.com>
Subject: Re: [PATCH net v3 2/3] dpll: fix register pin with unregistered
 parent pin

Mon, Jan 15, 2024 at 09:52:40AM CET, arkadiusz.kubalewski@...el.com wrote:
>In case of multiple kernel module instances using the same dpll device:
>if only one registers dpll device, then only that one can register
>directly connected pins with a dpll device. When unregistered parent is
>responsible for determining if the muxed pin can be registered with it
>or not, the drivers need to be loaded in serialized order to work
>correctly - first the driver instance which registers the direct pins
>needs to be loaded, then the other instances could register muxed type
>pins.
>
>Allow registration of a pin with a parent even if the parent was not
>yet registered, thus allow ability for unserialized driver instance
>load order.
>Do not WARN_ON notification for unregistered pin, which can be invoked
>for described case, instead just return error.
>
>Fixes: 9431063ad323 ("dpll: core: Add DPLL framework base functions")
>Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions")
>Reviewed-by: Jan Glaza <jan.glaza@...el.com>
>Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
>---
>v3:
>- allow register with non registered parent dpll device for consistency
>
> drivers/dpll/dpll_core.c    | 6 ------
> drivers/dpll/dpll_netlink.c | 2 +-
> 2 files changed, 1 insertion(+), 7 deletions(-)
>
>diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c
>index fbac32af78b7..69005d8489d3 100644
>--- a/drivers/dpll/dpll_core.c
>+++ b/drivers/dpll/dpll_core.c
>@@ -28,8 +28,6 @@ static u32 dpll_xa_id;
> 	WARN_ON_ONCE(!xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED))
> #define ASSERT_DPLL_NOT_REGISTERED(d)	\
> 	WARN_ON_ONCE(xa_get_mark(&dpll_device_xa, (d)->id, DPLL_REGISTERED))
>-#define ASSERT_PIN_REGISTERED(p)	\
>-	WARN_ON_ONCE(!xa_get_mark(&dpll_pin_xa, (p)->id, DPLL_REGISTERED))

Also, for consistency, this could be called from
__dpll_pin_unregister(). But that is net-next material.


Reviewed-by: Jiri Pirko <jiri@...dia.com>



> 
> struct dpll_device_registration {
> 	struct list_head list;
>@@ -613,8 +611,6 @@ dpll_pin_register(struct dpll_device *dpll, struct dpll_pin *pin,
> 	    WARN_ON(!ops->state_on_dpll_get) ||
> 	    WARN_ON(!ops->direction_get))
> 		return -EINVAL;
>-	if (ASSERT_DPLL_REGISTERED(dpll))
>-		return -EINVAL;
> 
> 	mutex_lock(&dpll_lock);
> 	if (WARN_ON(!(dpll->module == pin->module &&
>@@ -692,8 +688,6 @@ int dpll_pin_on_pin_register(struct dpll_pin *parent, struct dpll_pin *pin,
> 	    WARN_ON(!ops->state_on_pin_get) ||
> 	    WARN_ON(!ops->direction_get))
> 		return -EINVAL;
>-	if (ASSERT_PIN_REGISTERED(parent))
>-		return -EINVAL;
> 
> 	mutex_lock(&dpll_lock);
> 	ret = dpll_xa_ref_pin_add(&pin->parent_refs, parent, ops, priv);
>diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c
>index 4c64611d32ac..108c002537e6 100644
>--- a/drivers/dpll/dpll_netlink.c
>+++ b/drivers/dpll/dpll_netlink.c
>@@ -551,7 +551,7 @@ dpll_pin_event_send(enum dpll_cmd event, struct dpll_pin *pin)
> 	int ret = -ENOMEM;
> 	void *hdr;
> 
>-	if (WARN_ON(!xa_get_mark(&dpll_pin_xa, pin->id, DPLL_REGISTERED)))
>+	if (!xa_get_mark(&dpll_pin_xa, pin->id, DPLL_REGISTERED))
> 		return -ENODEV;
> 
> 	msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
>-- 
>2.38.1
>