From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from sender4-op-o15.zoho.com (sender4-op-o15.zoho.com [136.143.188.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 11B85D27E; Tue, 4 Nov 2025 20:48:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=pass smtp.client-ip=136.143.188.15 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762289334; cv=pass; b=jCZXGBrE1kC3B2HWJRXyM02jkYq+MUw3nb1AiPMIdoPXBKCnRat0D34od9LYTgKsi4lKE4mbJjYVFys5WwiLUZTDanqu33Hibwpb2J8cb6aUNSq7YBzTa0gIJHKgjjQnaxrRH0RU11VV5USqdCYv+8cpKQs5eHJQxSqUrsPYJSA= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762289334; c=relaxed/simple; bh=JdY1aNujMiMrxiL2I55cCJ61Rm9VKSb0vuBTDXOn1DY=; h=Message-ID:Subject:From:To:Cc:In-Reply-To:References:Content-Type: Date:MIME-Version; b=CHHDYttnziecYJlT7mpVEFoc1la5kOFY37u937+FVldANip/3/q+gKCDbDwgwD620B7Igt7Kxsuoghpi+bDK1RBLaKcdAGh0WrT6BXY5WLGQzgYLVkxx8PdnUrkxZSy3bv8hgDfjl33q5fK3JekibG1sc9GGrFSFcaiyj5L04fI= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rong.moe; spf=pass smtp.mailfrom=rong.moe; dkim=pass (1024-bit key) header.d=rong.moe header.i=i@rong.moe header.b=M9wOa5d4; arc=pass smtp.client-ip=136.143.188.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=rong.moe Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rong.moe Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=rong.moe header.i=i@rong.moe header.b="M9wOa5d4" ARC-Seal: i=1; a=rsa-sha256; t=1762289310; cv=none; d=zohomail.com; s=zohoarc; b=D9WAyCTQY/TzRKZq5rUl7boJN8TFb58biWhbSs9iIJgRrbkk8mH4V9LOCqita2stflZ0yalJg66p+u+nMpzzELZmsEt0NngmPoxSFlgCCHdf7N6N49HVv+31edQ94uls2OcCOO5lHPz2F7RnRt85OCnNp9PQs5D6BT4rHIbOD/I= ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=zohomail.com; s=zohoarc; t=1762289310; h=Content-Type:Content-Transfer-Encoding:Cc:Cc:Date:Date:From:From:In-Reply-To:MIME-Version:Message-ID:References:Subject:Subject:To:To:Message-Id:Reply-To; bh=+AEnSoUPtd8zUzeC8ApRI6Zy8NzxIcVRMdSUtjoFYPI=; b=lDU0x+u0COCqn8KjkUkEMAN5mULpG5vi+xeF7d8EWXMd5VXIwnCnkS9g3INGorV1K5BGmQwaM7j3zbDFoa2B84KIOYjxdU5H/4XN7KmKhOvQDsyD9fzRuFJkTGvOlj7ceyTB/wlSd8GdcEzZwD62unf51wDAHhncwBg5FcZPoQY= ARC-Authentication-Results: i=1; mx.zohomail.com; dkim=pass header.i=rong.moe; spf=pass smtp.mailfrom=i@rong.moe; dmarc=pass header.from= DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; t=1762289309; s=zmail; d=rong.moe; i=i@rong.moe; h=Message-ID:Subject:Subject:From:From:To:To:Cc:Cc:In-Reply-To:References:Content-Type:Content-Transfer-Encoding:Date:Date:MIME-Version:Message-Id:Reply-To; bh=+AEnSoUPtd8zUzeC8ApRI6Zy8NzxIcVRMdSUtjoFYPI=; b=M9wOa5d4+JtgTDni0tnW8Ys56vniVt2139ZQiNIJwKFjX2YmaS8wjVDZZA2cfZ5z 3ECXH2se7ZX60Qg92vDA+45AnlJSMf2QSCq8kWgoAE0CDMLKsaBYtHULxniLOONylcI Fjf2cRuqGL2Eabc50pDX73ckc7EZrKN/r7AIOyfo= Received: by mx.zohomail.com with SMTPS id 1762289307486381.83977599800426; Tue, 4 Nov 2025 12:48:27 -0800 (PST) Message-ID: Subject: Re: [PATCH v3 3/6] platform/x86: lenovo-wmi-{capdata,other}: Support multiple Capability Data From: Rong Zhang To: Armin Wolf , Mark Pearson , "Derek J. Clark" , Hans de Goede , Ilpo =?ISO-8859-1?Q?J=E4rvinen?= Cc: Guenter Roeck , platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, linux-hwmon@vger.kernel.org In-Reply-To: <8c14706f-f3cc-45e9-bdef-db2c9171f46e@gmx.de> References: <20251031155349.24693-1-i@rong.moe> <20251031155349.24693-4-i@rong.moe> <8c14706f-f3cc-45e9-bdef-db2c9171f46e@gmx.de> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Date: Wed, 05 Nov 2025 04:43:16 +0800 Precedence: bulk X-Mailing-List: linux-hwmon@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Evolution 3.56.2-5 X-ZohoMailClient: External Hi Armin, On Tue, 2025-11-04 at 21:20 +0100, Armin Wolf wrote: > Am 31.10.25 um 16:51 schrieb Rong Zhang: >=20 > > The current implementation are heavily bound to capdata01. Rewrite it s= o > > that it is suitable to utilize other Capability Data as well. > >=20 > > No functional change intended. > >=20 > > Signed-off-by: Rong Zhang > > Reviewed-by: Derek J. Clark > > Tested-by: Derek J. Clark > > --- > > Changes in v2: > > - Fix function parameter 'type' not described in 'lwmi_cd_match' (thank= s > > kernel test bot) > > --- > > drivers/platform/x86/lenovo/wmi-capdata.c | 208 +++++++++++++++++----= - > > drivers/platform/x86/lenovo/wmi-capdata.h | 7 +- > > drivers/platform/x86/lenovo/wmi-other.c | 27 ++- > > 3 files changed, 190 insertions(+), 52 deletions(-) > >=20 > > diff --git a/drivers/platform/x86/lenovo/wmi-capdata.c b/drivers/platfo= rm/x86/lenovo/wmi-capdata.c > > index c5e74b2bfeb3..1f7fc09b7c3f 100644 > > --- a/drivers/platform/x86/lenovo/wmi-capdata.c > > +++ b/drivers/platform/x86/lenovo/wmi-capdata.c > > @@ -12,8 +12,13 @@ > > * > > * Copyright (C) 2025 Derek J. Clark > > * - Initial implementation (formerly named lenovo-wmi-capdata01) > > + * > > + * Copyright (C) 2025 Rong Zhang > > + * - Unified implementation > > */ > > =20 > > +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt > > + > > #include > > #include > > #include > > @@ -36,6 +41,25 @@ > > #define ACPI_AC_CLASS "ac_adapter" > > #define ACPI_AC_NOTIFY_STATUS 0x80 > > =20 > > +enum lwmi_cd_type { > > + LENOVO_CAPABILITY_DATA_01, > > +}; > > + > > +#define LWMI_CD_TABLE_ITEM(_type) \ > > + [_type] =3D { \ > > + .guid_string =3D _type##_GUID, \ > > + .name =3D #_type, \ > > + .type =3D _type, \ > > + } > > + > > +static const struct lwmi_cd_info { > > + const char *guid_string; > > + const char *name; > > + enum lwmi_cd_type type; > > +} lwmi_cd_table[] =3D { > > + LWMI_CD_TABLE_ITEM(LENOVO_CAPABILITY_DATA_01), > > +}; > > + > > struct lwmi_cd_priv { > > struct notifier_block acpi_nb; /* ACPI events */ > > struct wmi_device *wdev; > > @@ -44,15 +68,19 @@ struct lwmi_cd_priv { > > =20 > > struct cd_list { > > struct mutex list_mutex; /* list R/W mutex */ > > + enum lwmi_cd_type type; > > u8 count; > > - struct capdata01 data[]; > > + > > + union { > > + DECLARE_FLEX_ARRAY(struct capdata01, cd01); > > + }; > > }; > > =20 > > /** > > * lwmi_cd_component_bind() - Bind component to master device. > > * @cd_dev: Pointer to the lenovo-wmi-capdata driver parent device. > > * @om_dev: Pointer to the lenovo-wmi-other driver parent device. > > - * @data: cd_list object pointer used to return the capability data. > > + * @data: lwmi_cd_binder object pointer used to return the capability = data. > > * > > * On lenovo-wmi-other's master bind, provide a pointer to the local = capdata > > * list. This is used to call lwmi_cd*_get_data to look up attribute = data > > @@ -64,9 +92,15 @@ static int lwmi_cd_component_bind(struct device *cd_= dev, > > struct device *om_dev, void *data) > > { > > struct lwmi_cd_priv *priv =3D dev_get_drvdata(cd_dev); > > - struct cd_list **cd_list =3D data; > > + struct lwmi_cd_binder *binder =3D data; > > =20 > > - *cd_list =3D priv->list; > > + switch (priv->list->type) { > > + case LENOVO_CAPABILITY_DATA_01: > > + binder->cd01_list =3D priv->list; > > + break; > > + default: > > + return -EINVAL; > > + } > > =20 > > return 0; > > } > > @@ -76,30 +110,33 @@ static const struct component_ops lwmi_cd_componen= t_ops =3D { > > }; > > =20 > > /** > > - * lwmi_cd01_get_data - Get the data of the specified attribute > > + * lwmi_cd*_get_data - Get the data of the specified attribute > > * @list: The lenovo-wmi-capdata pointer to its cd_list struct. > > * @attribute_id: The capdata attribute ID to be found. > > - * @output: Pointer to a capdata01 struct to return the data. > > + * @output: Pointer to a capdata* struct to return the data. > > * > > - * Retrieves the capability data 01 struct pointer for the given > > - * attribute for its specified thermal mode. > > + * Retrieves the capability data struct pointer for the given > > + * attribute. > > * > > * Return: 0 on success, or -EINVAL. > > */ > > -int lwmi_cd01_get_data(struct cd_list *list, u32 attribute_id, struct = capdata01 *output) > > -{ > > - u8 idx; > > - > > - guard(mutex)(&list->list_mutex); > > - for (idx =3D 0; idx < list->count; idx++) { > > - if (list->data[idx].id !=3D attribute_id) > > - continue; > > - memcpy(output, &list->data[idx], sizeof(list->data[idx])); > > - return 0; > > +#define DEF_LWMI_CDXX_GET_DATA(_cdxx, _cd_type, _output_t) \ > > + int lwmi_##_cdxx##_get_data(struct cd_list *list, u32 attribute_id, _= output_t *output) \ > > + { \ > > + u8 idx; \ > > + if (WARN_ON(list->type !=3D _cd_type)) \ > > + return -EINVAL; \ > > + guard(mutex)(&list->list_mutex); \ > > + for (idx =3D 0; idx < list->count; idx++) { \ > > + if (list->_cdxx[idx].id !=3D attribute_id) \ > > + continue; \ > > + memcpy(output, &list->_cdxx[idx], sizeof(list->_cdxx[idx])); \ > > + return 0; \ > > + } \ > > + return -EINVAL; \ > > } > > =20 > > - return -EINVAL; > > -} > > +DEF_LWMI_CDXX_GET_DATA(cd01, LENOVO_CAPABILITY_DATA_01, struct capdata= 01); > > EXPORT_SYMBOL_NS_GPL(lwmi_cd01_get_data, "LENOVO_WMI_CD"); > > =20 > > /** > > @@ -112,10 +149,21 @@ EXPORT_SYMBOL_NS_GPL(lwmi_cd01_get_data, "LENOVO_= WMI_CD"); > > */ > > static int lwmi_cd_cache(struct lwmi_cd_priv *priv) > > { > > + size_t size; > > int idx; > > + void *p; > > + > > + switch (priv->list->type) { > > + case LENOVO_CAPABILITY_DATA_01: > > + p =3D &priv->list->cd01[0]; > > + size =3D sizeof(priv->list->cd01[0]); > > + break; > > + default: > > + return -EINVAL; > > + } > > =20 > > guard(mutex)(&priv->list->list_mutex); > > - for (idx =3D 0; idx < priv->list->count; idx++) { > > + for (idx =3D 0; idx < priv->list->count; idx++, p +=3D size) { > > union acpi_object *ret_obj __free(kfree) =3D NULL; > > =20 > > ret_obj =3D wmidev_block_query(priv->wdev, idx); > > @@ -123,11 +171,10 @@ static int lwmi_cd_cache(struct lwmi_cd_priv *pri= v) > > return -ENODEV; > > =20 > > if (ret_obj->type !=3D ACPI_TYPE_BUFFER || > > - ret_obj->buffer.length < sizeof(priv->list->data[idx])) > > + ret_obj->buffer.length < size) > > continue; > > =20 > > - memcpy(&priv->list->data[idx], ret_obj->buffer.pointer, > > - ret_obj->buffer.length); > > + memcpy(p, ret_obj->buffer.pointer, size); > > } > > =20 > > return 0; > > @@ -136,20 +183,28 @@ static int lwmi_cd_cache(struct lwmi_cd_priv *pri= v) > > /** > > * lwmi_cd_alloc() - Allocate a cd_list struct in drvdata > > * @priv: lenovo-wmi-capdata driver data. > > + * @type: The type of capability data. > > * > > * Allocate a cd_list struct large enough to contain data from all WM= I data > > * blocks provided by the interface. > > * > > * Return: 0 on success, or an error. > > */ > > -static int lwmi_cd_alloc(struct lwmi_cd_priv *priv) > > +static int lwmi_cd_alloc(struct lwmi_cd_priv *priv, enum lwmi_cd_type = type) > > { > > struct cd_list *list; > > size_t list_size; > > int count, ret; > > =20 > > count =3D wmidev_instance_count(priv->wdev); > > - list_size =3D struct_size(list, data, count); > > + > > + switch (type) { > > + case LENOVO_CAPABILITY_DATA_01: > > + list_size =3D struct_size(list, cd01, count); > > + break; > > + default: > > + return -EINVAL; > > + } > > =20 > > list =3D devm_kzalloc(&priv->wdev->dev, list_size, GFP_KERNEL); > > if (!list) > > @@ -159,6 +214,7 @@ static int lwmi_cd_alloc(struct lwmi_cd_priv *priv) > > if (ret) > > return ret; > > =20 > > + list->type =3D type; > > list->count =3D count; > > priv->list =3D list; > > =20 > > @@ -168,6 +224,7 @@ static int lwmi_cd_alloc(struct lwmi_cd_priv *priv) > > /** > > * lwmi_cd_setup() - Cache all WMI data block information > > * @priv: lenovo-wmi-capdata driver data. > > + * @type: The type of capability data. > > * > > * Allocate a cd_list struct large enough to contain data from all WM= I data > > * blocks provided by the interface. Then loop through each data bloc= k and > > @@ -175,11 +232,11 @@ static int lwmi_cd_alloc(struct lwmi_cd_priv *pri= v) > > * > > * Return: 0 on success, or an error code. > > */ > > -static int lwmi_cd_setup(struct lwmi_cd_priv *priv) > > +static int lwmi_cd_setup(struct lwmi_cd_priv *priv, enum lwmi_cd_type = type) > > { > > int ret; > > =20 > > - ret =3D lwmi_cd_alloc(priv); > > + ret =3D lwmi_cd_alloc(priv, type); > > if (ret) > > return ret; > > =20 > > @@ -235,9 +292,13 @@ static void lwmi_cd01_unregister(void *data) > > =20 > > static int lwmi_cd_probe(struct wmi_device *wdev, const void *context= ) > > { > > + const struct lwmi_cd_info *info =3D context; > > struct lwmi_cd_priv *priv; > > int ret; > > =20 > > + if (!info) > > + return -EINVAL; > > + > > priv =3D devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL); > > if (!priv) > > return -ENOMEM; > > @@ -245,21 +306,34 @@ static int lwmi_cd_probe(struct wmi_device *wdev,= const void *context) > > priv->wdev =3D wdev; > > dev_set_drvdata(&wdev->dev, priv); > > =20 > > - ret =3D lwmi_cd_setup(priv); > > + ret =3D lwmi_cd_setup(priv, info->type); > > if (ret) > > - return ret; > > + goto out; > > =20 > > - priv->acpi_nb.notifier_call =3D lwmi_cd01_notifier_call; > > + if (info->type =3D=3D LENOVO_CAPABILITY_DATA_01) { > > + priv->acpi_nb.notifier_call =3D lwmi_cd01_notifier_call; > > =20 > > - ret =3D register_acpi_notifier(&priv->acpi_nb); > > - if (ret) > > - return ret; > > + ret =3D register_acpi_notifier(&priv->acpi_nb); > > + if (ret) > > + goto out; > > =20 > > - ret =3D devm_add_action_or_reset(&wdev->dev, lwmi_cd01_unregister, &p= riv->acpi_nb); > > - if (ret) > > - return ret; > > + ret =3D devm_add_action_or_reset(&wdev->dev, lwmi_cd01_unregister, > > + &priv->acpi_nb); > > + if (ret) > > + goto out; > > + } > > + > > + ret =3D component_add(&wdev->dev, &lwmi_cd_component_ops); > > =20 > > - return component_add(&wdev->dev, &lwmi_cd_component_ops); > > +out: > > + if (ret) { > > + dev_err(&wdev->dev, "failed to register %s: %d\n", > > + info->name, ret); > > + } else { > > + dev_info(&wdev->dev, "registered %s with %u items\n", > > + info->name, priv->list->count); > > + } > > + return ret; > > } > > =20 > > static void lwmi_cd_remove(struct wmi_device *wdev) > > @@ -267,8 +341,12 @@ static void lwmi_cd_remove(struct wmi_device *wdev= ) > > component_del(&wdev->dev, &lwmi_cd_component_ops); > > } > > =20 > > +#define LWMI_CD_WDEV_ID(_type) \ > > + .guid_string =3D _type##_GUID, \ > > + .context =3D &lwmi_cd_table[_type] > > + > > static const struct wmi_device_id lwmi_cd_id_table[] =3D { > > - { LENOVO_CAPABILITY_DATA_01_GUID, NULL }, > > + { LWMI_CD_WDEV_ID(LENOVO_CAPABILITY_DATA_01) }, > > {} > > }; > > =20 > > @@ -284,21 +362,61 @@ static struct wmi_driver lwmi_cd_driver =3D { > > }; > > =20 > > /** > > - * lwmi_cd01_match() - Match rule for the master driver. > > - * @dev: Pointer to the capability data 01 parent device. > > - * @data: Unused void pointer for passing match criteria. > > + * lwmi_cd_match() - Match rule for the master driver. > > + * @dev: Pointer to the capability data parent device. > > + * @type: Pointer to capability data type (enum lwmi_cd_type *) to mat= ch. > > * > > * Return: int. > > */ > > -int lwmi_cd01_match(struct device *dev, void *data) > > +static int lwmi_cd_match(struct device *dev, void *type) > > +{ > > + struct lwmi_cd_priv *priv; > > + > > + if (dev->driver !=3D &lwmi_cd_driver.driver) > > + return false; > > + > > + priv =3D dev_get_drvdata(dev); > > + return priv->list->type =3D=3D *(enum lwmi_cd_type *)type; > > +} > > + > > +/** > > + * lwmi_cd_match_add_all() - Add all match rule for the master driver. > > + * @master: Pointer to the master device. > > + * @matchptr: Pointer to the returned component_match pointer. > > + * > > + * Adds all component matches to the list stored in @matchptr for the = @master > > + * device. @matchptr must be initialized to NULL. This matches all ava= ilable > > + * capdata types on the machine. > > + */ > > +void lwmi_cd_match_add_all(struct device *master, struct component_mat= ch **matchptr) > > { > > - return dev->driver =3D=3D &lwmi_cd_driver.driver; > > + int i; > > + > > + if (WARN_ON(*matchptr)) > > + return; > > + > > + for (i =3D 0; i < ARRAY_SIZE(lwmi_cd_table); i++) { > > + if (!lwmi_cd_table[i].guid_string || > > + !wmi_has_guid(lwmi_cd_table[i].guid_string)) > > + continue; >=20 > I am still not happy about this. AFAIK as soon as the ordinary capdata WM= I devices are bound together, > the firmware tells you whether or not the additional fan data WMI device = is available. Maybe you can do > something like this: >=20 > 1. Bind both capdata WMI devices as usual. > 2. Check if a fan data WMI device is available (you can use a DMI-based q= uirk list for devices were > the firmware reports invalid data). > 3. Register an additional component that binds to the fan data WMI device= . > 4. Bind both the additional component and the component registered by the= fan data WMI device. > 5. Register the hwmon device with additional fan data. >=20 > If the fan data WMI device is not available, you can simply skip steps 3 = and 4 and simply > register the hwmon device with any additional fan data. >=20 > What do you think? Thanks for your suggestion. Will adopt it in v4. > Thanks, > Armin Wolf Thanks, Rong > > + > > + component_match_add(master, matchptr, lwmi_cd_match, > > + (void *)&lwmi_cd_table[i].type); > > + if (IS_ERR(matchptr)) > > + return; > > + } > > + > > + if (!*matchptr) { > > + pr_warn("a master driver requested capability data, but nothing is a= vailable\n"); > > + *matchptr =3D ERR_PTR(-ENODEV); > > + } > > } > > -EXPORT_SYMBOL_NS_GPL(lwmi_cd01_match, "LENOVO_WMI_CD"); > > +EXPORT_SYMBOL_NS_GPL(lwmi_cd_match_add_all, "LENOVO_WMI_CD"); > > =20 > > module_wmi_driver(lwmi_cd_driver); > > =20 > > MODULE_DEVICE_TABLE(wmi, lwmi_cd_id_table); > > MODULE_AUTHOR("Derek J. Clark "); > > +MODULE_AUTHOR("Rong Zhang "); > > MODULE_DESCRIPTION("Lenovo Capability Data WMI Driver"); > > MODULE_LICENSE("GPL"); > > diff --git a/drivers/platform/x86/lenovo/wmi-capdata.h b/drivers/platfo= rm/x86/lenovo/wmi-capdata.h > > index 2a4746e38ad4..1e5fce7836cb 100644 > > --- a/drivers/platform/x86/lenovo/wmi-capdata.h > > +++ b/drivers/platform/x86/lenovo/wmi-capdata.h > > @@ -7,6 +7,7 @@ > > =20 > > #include > > =20 > > +struct component_match; > > struct device; > > struct cd_list; > > =20 > > @@ -19,7 +20,11 @@ struct capdata01 { > > u32 max_value; > > }; > > =20 > > +struct lwmi_cd_binder { > > + struct cd_list *cd01_list; > > +}; > > + > > int lwmi_cd01_get_data(struct cd_list *list, u32 attribute_id, struct= capdata01 *output); > > -int lwmi_cd01_match(struct device *dev, void *data); > > +void lwmi_cd_match_add_all(struct device *master, struct component_mat= ch **matchptr); > > =20 > > #endif /* !_LENOVO_WMI_CAPDATA_H_ */ > > diff --git a/drivers/platform/x86/lenovo/wmi-other.c b/drivers/platform= /x86/lenovo/wmi-other.c > > index c6dc1b4cff84..20c6ff0be37a 100644 > > --- a/drivers/platform/x86/lenovo/wmi-other.c > > +++ b/drivers/platform/x86/lenovo/wmi-other.c > > @@ -579,14 +579,14 @@ static void lwmi_om_fw_attr_remove(struct lwmi_om= _priv *priv) > > static int lwmi_om_master_bind(struct device *dev) > > { > > struct lwmi_om_priv *priv =3D dev_get_drvdata(dev); > > - struct cd_list *tmp_list; > > + struct lwmi_cd_binder binder =3D { 0 }; > > int ret; > > =20 > > - ret =3D component_bind_all(dev, &tmp_list); > > + ret =3D component_bind_all(dev, &binder); > > if (ret) > > return ret; > > =20 > > - priv->cd01_list =3D tmp_list; > > + priv->cd01_list =3D binder.cd01_list; > > if (!priv->cd01_list) > > return -ENODEV; > > =20 > > @@ -618,6 +618,7 @@ static int lwmi_other_probe(struct wmi_device *wdev= , const void *context) > > { > > struct component_match *master_match =3D NULL; > > struct lwmi_om_priv *priv; > > + int ret; > > =20 > > priv =3D devm_kzalloc(&wdev->dev, sizeof(*priv), GFP_KERNEL); > > if (!priv) > > @@ -626,12 +627,26 @@ static int lwmi_other_probe(struct wmi_device *wd= ev, const void *context) > > priv->wdev =3D wdev; > > dev_set_drvdata(&wdev->dev, priv); > > =20 > > - component_match_add(&wdev->dev, &master_match, lwmi_cd01_match, NULL)= ; > > + lwmi_cd_match_add_all(&wdev->dev, &master_match); > > if (IS_ERR(master_match)) > > return PTR_ERR(master_match); > > =20 > > - return component_master_add_with_match(&wdev->dev, &lwmi_om_master_op= s, > > - master_match); > > + ret =3D component_master_add_with_match(&wdev->dev, &lwmi_om_master_o= ps, > > + master_match); > > + if (ret) > > + return ret; > > + > > + if (likely(component_master_is_bound(&wdev->dev, &lwmi_om_master_ops)= )) > > + return 0; > > + > > + /* > > + * The bind callbacks of both master and components were never called= in > > + * this case - this driver won't work at all. Failing... > > + */ > > + dev_err(&wdev->dev, "unbound master; is any component failing to be p= robed?"); > > + > > + component_master_del(&wdev->dev, &lwmi_om_master_ops); > > + return -EXDEV; > > } > > =20 > > static void lwmi_other_remove(struct wmi_device *wdev)