From patchwork Fri Jan 19 13:43:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kubalewski, Arkadiusz" X-Patchwork-Id: 13523803 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.31]) (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 6A44952F97; Fri, 19 Jan 2024 13:46:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=134.134.136.31 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705671977; cv=none; b=KM6Ixt2u+ffkELMHLj7BD6AImQbISsmY0c+qZu5SLo41yAUd8zItAgkf8+1qGz4R4XbWqnVbvMcrkOuu69w5FjIqDxpwqBk1KQto1m3CxIE9lm791ElFIGwXS6/A9baGqPFi3DZFBajIfK6bWjoty2gCLBFAWjIR+9JGs+Skvzs= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705671977; c=relaxed/simple; bh=tRIwU7gwsDz+zqq2CsA81lk0Upeoqq9BY6wWzJVRuqU=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=eqoy37I9yBMTuDrJ2X16c8GuO8aSVDIEs7Lu93JIrauNwzckkbr/eR71R89UWImyqrceD6LoYjoCRqYkmjyUnid6jIONTRgQk30oJ57HHsAqSXqdOAuWrQabQW9uVX4e/6r2vXpUCYLiRFqKxWIa2dhvuNzbAUOA7LHWNz3UDvA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=YLHRE/Q2; arc=none smtp.client-ip=134.134.136.31 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="YLHRE/Q2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1705671976; x=1737207976; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=tRIwU7gwsDz+zqq2CsA81lk0Upeoqq9BY6wWzJVRuqU=; b=YLHRE/Q2MMv7Xh0M04+hwbOiozvm2CqBJq72FO+Q7wxX5zIFUF6w2SrB Ci/dx485PupGamu7ZtEY3YDDaLzEhPO5PHOEkdrvNdZVLELBsdjdqo0rm 3GN2oPVXRwkmI4bEiIuz6moINXZ7YhTgR0D97PE6U64lR+ngLD6nUpBO9 p/FOBzKnRszkuDkCgnrXq9Dskwcu0XipjPAbu/OOUeNTJtuF/mjvtMRoa 1EVRD/GT8qqxml+zuVjX1s7aBVCn2QzBCxAcAyZ/NYg2b5udqdEhmDTBV dP6M5jirbmcmbGHwI83TorJ5j0vRHF+xjsFASV1njQRuq1jeRCTQg8Lz/ Q==; X-IronPort-AV: E=McAfee;i="6600,9927,10956"; a="465026897" X-IronPort-AV: E=Sophos;i="6.05,204,1701158400"; d="scan'208";a="465026897" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jan 2024 05:46:16 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10956"; a="788360387" X-IronPort-AV: E=Sophos;i="6.05,204,1701158400"; d="scan'208";a="788360387" Received: from amlin-018-114.igk.intel.com ([10.102.18.114]) by fmsmga007.fm.intel.com with ESMTP; 19 Jan 2024 05:46:13 -0800 From: Arkadiusz Kubalewski To: netdev@vger.kernel.org Cc: vadim.fedorenko@linux.dev, jiri@resnulli.us, davem@davemloft.net, milena.olech@intel.com, linux-kernel@vger.kernel.org, pabeni@redhat.com, kuba@kernel.org, mschmidt@redhat.com, Arkadiusz Kubalewski , Jiri Pirko Subject: [PATCH net v6 1/4] dpll: fix broken error path in dpll_pin_alloc(..) Date: Fri, 19 Jan 2024 14:43:01 +0100 Message-Id: <20240119134304.576956-2-arkadiusz.kubalewski@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> References: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org If pin type is not expected, or pin properities failed to allocate memory, the unwind error path shall not destroy pin's xarrays, which were not yet initialized. Add new goto label and use it to fix broken error path. Reviewed-by: Jiri Pirko Signed-off-by: Arkadiusz Kubalewski --- v6: - no changes, bump the series version drivers/dpll/dpll_core.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index 1eca8cc271f8..c08772ee9fd6 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -441,7 +441,7 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, if (WARN_ON(prop->type < DPLL_PIN_TYPE_MUX || prop->type > DPLL_PIN_TYPE_MAX)) { ret = -EINVAL; - goto err; + goto err_pin_prop; } pin->prop = prop; refcount_set(&pin->refcount, 1); @@ -450,11 +450,12 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, ret = xa_alloc_cyclic(&dpll_pin_xa, &pin->id, pin, xa_limit_32b, &dpll_pin_xa_id, GFP_KERNEL); if (ret) - goto err; + goto err_xa_alloc; return pin; -err: +err_xa_alloc: xa_destroy(&pin->dpll_refs); xa_destroy(&pin->parent_refs); +err_pin_prop: kfree(pin); return ERR_PTR(ret); } From patchwork Fri Jan 19 13:43:02 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kubalewski, Arkadiusz" X-Patchwork-Id: 13523804 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.31]) (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 31DE453E29; Fri, 19 Jan 2024 13:46:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=134.134.136.31 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705671982; cv=none; b=T/VmJCGJYcIxyJ7vZCKOIuHtI0VwsUZXfmCSsHGQ1bczeYvvLG/Q86BmA6pIKZhvCyJT6/Y1rLUH82r9uNlH/8h3vzatfU8N5NsQ4qgnvxgCD0Khv85Tp/i9CelVcQQ9n1omoIAYwSAh0bWbTXBqlnSdtVQUUCX17K6/Ta6p29I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1705671982; c=relaxed/simple; bh=9Hzv7z/GzbJUoDf2z55H/CEkFHLL/MMLhIxJemRBALY=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; 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b=iZ5x56Piyp1q7zenRPTL/P0eaG+/u3FdGoxP1OV/cOt4GMOjDE1bHxyU Lj1D2SOjLabrDBbdPkS4Qq/EGfESn/dL5qlZOkG1kqFwG9ufDsBxHFm0C x7f6RK6hF5NG056smy1YisZjCdedRfjmkhXZWajfVVlgA/xMjA/5wOVig r6GxG1GM4U4Gbad5BaCOCsUt0jk5DwJS5IeyytoNtqlmVm1ld43t0ariO +pabVuUtopa4rKwdweIpqR100jNuqd8Q8GjArEYPi11MXo3nddXm8zJRA Miz1O+Zt9QEJCMrSf5iCn7ARE/Rslyau7F1YWyKNgimubAGZQEfo7kJM7 A==; X-IronPort-AV: E=McAfee;i="6600,9927,10956"; a="465026909" X-IronPort-AV: E=Sophos;i="6.05,204,1701158400"; d="scan'208";a="465026909" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 19 Jan 2024 05:46:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10956"; a="788360397" X-IronPort-AV: E=Sophos;i="6.05,204,1701158400"; d="scan'208";a="788360397" Received: from amlin-018-114.igk.intel.com ([10.102.18.114]) by fmsmga007.fm.intel.com with ESMTP; 19 Jan 2024 05:46:16 -0800 From: Arkadiusz Kubalewski To: netdev@vger.kernel.org Cc: vadim.fedorenko@linux.dev, jiri@resnulli.us, davem@davemloft.net, milena.olech@intel.com, linux-kernel@vger.kernel.org, pabeni@redhat.com, kuba@kernel.org, mschmidt@redhat.com, Arkadiusz Kubalewski , Jan Glaza , Przemek Kitszel Subject: [PATCH net v6 2/4] dpll: fix pin dump crash for rebound module Date: Fri, 19 Jan 2024 14:43:02 +0100 Message-Id: <20240119134304.576956-3-arkadiusz.kubalewski@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> References: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org When a kernel module is unbound but the pin resources were not entirely freed (other kernel module instance of the same PCI device have had kept the reference to that pin), and kernel module is again bound, the pin properties would not be updated (the properties are only assigned when memory for the pin is allocated), prop pointer still points to the kernel module memory of the kernel module which was deallocated on the unbind. If the pin dump is invoked in this state, the result is a kernel crash. Prevent the crash by storing persistent pin properties in dpll subsystem, copy the content from the kernel module when pin is allocated, instead of using memory of the kernel module. Fixes: 9431063ad323 ("dpll: core: Add DPLL framework base functions") Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions") Reviewed-by: Jan Glaza Reviewed-by: Przemek Kitszel Signed-off-by: Arkadiusz Kubalewski Reviewed-by: Jiri Pirko --- v6: - add missing call to dpll_pin_prop_free(..) on failed XA alloc path in dpll_pin_alloc(..) drivers/dpll/dpll_core.c | 55 +++++++++++++++++++++++++++++++++++-- drivers/dpll/dpll_core.h | 4 +-- drivers/dpll/dpll_netlink.c | 28 +++++++++---------- 3 files changed, 69 insertions(+), 18 deletions(-) diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index c08772ee9fd6..cb62696467d1 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -425,6 +425,53 @@ void dpll_device_unregister(struct dpll_device *dpll, } EXPORT_SYMBOL_GPL(dpll_device_unregister); +static void dpll_pin_prop_free(struct dpll_pin_properties *prop) +{ + kfree(prop->package_label); + kfree(prop->panel_label); + kfree(prop->board_label); + kfree(prop->freq_supported); +} + +static int dpll_pin_prop_dup(const struct dpll_pin_properties *src, + struct dpll_pin_properties *dst) +{ + memcpy(dst, src, sizeof(*dst)); + if (src->freq_supported && src->freq_supported_num) { + size_t freq_size = src->freq_supported_num * + sizeof(*src->freq_supported); + dst->freq_supported = kmemdup(src->freq_supported, + freq_size, GFP_KERNEL); + if (!src->freq_supported) + return -ENOMEM; + } + if (src->board_label) { + dst->board_label = kstrdup(src->board_label, GFP_KERNEL); + if (!dst->board_label) + goto err_board_label; + } + if (src->panel_label) { + dst->panel_label = kstrdup(src->panel_label, GFP_KERNEL); + if (!dst->panel_label) + goto err_panel_label; + } + if (src->package_label) { + dst->package_label = kstrdup(src->package_label, GFP_KERNEL); + if (!dst->package_label) + goto err_package_label; + } + + return 0; + +err_package_label: + kfree(dst->panel_label); +err_panel_label: + kfree(dst->board_label); +err_board_label: + kfree(dst->freq_supported); + return -ENOMEM; +} + static struct dpll_pin * dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, const struct dpll_pin_properties *prop) @@ -443,7 +490,9 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, ret = -EINVAL; goto err_pin_prop; } - pin->prop = prop; + ret = dpll_pin_prop_dup(prop, &pin->prop); + if (ret) + goto err_pin_prop; refcount_set(&pin->refcount, 1); xa_init_flags(&pin->dpll_refs, XA_FLAGS_ALLOC); xa_init_flags(&pin->parent_refs, XA_FLAGS_ALLOC); @@ -455,6 +504,7 @@ dpll_pin_alloc(u64 clock_id, u32 pin_idx, struct module *module, err_xa_alloc: xa_destroy(&pin->dpll_refs); xa_destroy(&pin->parent_refs); + dpll_pin_prop_free(&pin->prop); err_pin_prop: kfree(pin); return ERR_PTR(ret); @@ -515,6 +565,7 @@ void dpll_pin_put(struct dpll_pin *pin) xa_destroy(&pin->dpll_refs); xa_destroy(&pin->parent_refs); xa_erase(&dpll_pin_xa, pin->id); + dpll_pin_prop_free(&pin->prop); kfree(pin); } mutex_unlock(&dpll_lock); @@ -637,7 +688,7 @@ int dpll_pin_on_pin_register(struct dpll_pin *parent, struct dpll_pin *pin, unsigned long i, stop; int ret; - if (WARN_ON(parent->prop->type != DPLL_PIN_TYPE_MUX)) + if (WARN_ON(parent->prop.type != DPLL_PIN_TYPE_MUX)) return -EINVAL; if (WARN_ON(!ops) || diff --git a/drivers/dpll/dpll_core.h b/drivers/dpll/dpll_core.h index 5585873c5c1b..717f715015c7 100644 --- a/drivers/dpll/dpll_core.h +++ b/drivers/dpll/dpll_core.h @@ -44,7 +44,7 @@ struct dpll_device { * @module: module of creator * @dpll_refs: hold referencees to dplls pin was registered with * @parent_refs: hold references to parent pins pin was registered with - * @prop: pointer to pin properties given by registerer + * @prop: pin properties copied from the registerer * @rclk_dev_name: holds name of device when pin can recover clock from it * @refcount: refcount **/ @@ -55,7 +55,7 @@ struct dpll_pin { struct module *module; struct xarray dpll_refs; struct xarray parent_refs; - const struct dpll_pin_properties *prop; + struct dpll_pin_properties prop; refcount_t refcount; }; diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 3370dbddb86b..30f5be020862 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -303,17 +303,17 @@ dpll_msg_add_pin_freq(struct sk_buff *msg, struct dpll_pin *pin, if (nla_put_64bit(msg, DPLL_A_PIN_FREQUENCY, sizeof(freq), &freq, DPLL_A_PIN_PAD)) return -EMSGSIZE; - for (fs = 0; fs < pin->prop->freq_supported_num; fs++) { + for (fs = 0; fs < pin->prop.freq_supported_num; fs++) { nest = nla_nest_start(msg, DPLL_A_PIN_FREQUENCY_SUPPORTED); if (!nest) return -EMSGSIZE; - freq = pin->prop->freq_supported[fs].min; + freq = pin->prop.freq_supported[fs].min; if (nla_put_64bit(msg, DPLL_A_PIN_FREQUENCY_MIN, sizeof(freq), &freq, DPLL_A_PIN_PAD)) { nla_nest_cancel(msg, nest); return -EMSGSIZE; } - freq = pin->prop->freq_supported[fs].max; + freq = pin->prop.freq_supported[fs].max; if (nla_put_64bit(msg, DPLL_A_PIN_FREQUENCY_MAX, sizeof(freq), &freq, DPLL_A_PIN_PAD)) { nla_nest_cancel(msg, nest); @@ -329,9 +329,9 @@ static bool dpll_pin_is_freq_supported(struct dpll_pin *pin, u32 freq) { int fs; - for (fs = 0; fs < pin->prop->freq_supported_num; fs++) - if (freq >= pin->prop->freq_supported[fs].min && - freq <= pin->prop->freq_supported[fs].max) + for (fs = 0; fs < pin->prop.freq_supported_num; fs++) + if (freq >= pin->prop.freq_supported[fs].min && + freq <= pin->prop.freq_supported[fs].max) return true; return false; } @@ -421,7 +421,7 @@ static int dpll_cmd_pin_get_one(struct sk_buff *msg, struct dpll_pin *pin, struct netlink_ext_ack *extack) { - const struct dpll_pin_properties *prop = pin->prop; + const struct dpll_pin_properties *prop = &pin->prop; struct dpll_pin_ref *ref; int ret; @@ -717,7 +717,7 @@ dpll_pin_on_pin_state_set(struct dpll_pin *pin, u32 parent_idx, int ret; if (!(DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE & - pin->prop->capabilities)) { + pin->prop.capabilities)) { NL_SET_ERR_MSG(extack, "state changing is not allowed"); return -EOPNOTSUPP; } @@ -753,7 +753,7 @@ dpll_pin_state_set(struct dpll_device *dpll, struct dpll_pin *pin, int ret; if (!(DPLL_PIN_CAPABILITIES_STATE_CAN_CHANGE & - pin->prop->capabilities)) { + pin->prop.capabilities)) { NL_SET_ERR_MSG(extack, "state changing is not allowed"); return -EOPNOTSUPP; } @@ -780,7 +780,7 @@ dpll_pin_prio_set(struct dpll_device *dpll, struct dpll_pin *pin, int ret; if (!(DPLL_PIN_CAPABILITIES_PRIORITY_CAN_CHANGE & - pin->prop->capabilities)) { + pin->prop.capabilities)) { NL_SET_ERR_MSG(extack, "prio changing is not allowed"); return -EOPNOTSUPP; } @@ -808,7 +808,7 @@ dpll_pin_direction_set(struct dpll_pin *pin, struct dpll_device *dpll, int ret; if (!(DPLL_PIN_CAPABILITIES_DIRECTION_CAN_CHANGE & - pin->prop->capabilities)) { + pin->prop.capabilities)) { NL_SET_ERR_MSG(extack, "direction changing is not allowed"); return -EOPNOTSUPP; } @@ -838,8 +838,8 @@ dpll_pin_phase_adj_set(struct dpll_pin *pin, struct nlattr *phase_adj_attr, int ret; phase_adj = nla_get_s32(phase_adj_attr); - if (phase_adj > pin->prop->phase_range.max || - phase_adj < pin->prop->phase_range.min) { + if (phase_adj > pin->prop.phase_range.max || + phase_adj < pin->prop.phase_range.min) { NL_SET_ERR_MSG_ATTR(extack, phase_adj_attr, "phase adjust value not supported"); return -EINVAL; @@ -1023,7 +1023,7 @@ dpll_pin_find(u64 clock_id, struct nlattr *mod_name_attr, unsigned long i; xa_for_each_marked(&dpll_pin_xa, i, pin, DPLL_REGISTERED) { - prop = pin->prop; + prop = &pin->prop; cid_match = clock_id ? pin->clock_id == clock_id : true; mod_match = mod_name_attr && module_name(pin->module) ? !nla_strcmp(mod_name_attr, From patchwork Fri Jan 19 13:43:03 2024 Content-Type: text/plain; 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Technically those are not available - as there is no dpll device in the system. Do not dump those pins and prevent userspace from any interaction with them. Provide a unified function to determine if the pin is available and use it before acting/responding for user requests. Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions") Reviewed-by: Jan Glaza Reviewed-by: Jiri Pirko Signed-off-by: Arkadiusz Kubalewski --- v6: - no changes, bump the series version drivers/dpll/dpll_netlink.c | 29 +++++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index 30f5be020862..314bb3775465 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -553,6 +553,24 @@ __dpll_device_change_ntf(struct dpll_device *dpll) return dpll_device_event_send(DPLL_CMD_DEVICE_CHANGE_NTF, dpll); } +static bool dpll_pin_available(struct dpll_pin *pin) +{ + struct dpll_pin_ref *par_ref; + unsigned long i; + + if (!xa_get_mark(&dpll_pin_xa, pin->id, DPLL_REGISTERED)) + return false; + xa_for_each(&pin->parent_refs, i, par_ref) + if (xa_get_mark(&dpll_pin_xa, par_ref->pin->id, + DPLL_REGISTERED)) + return true; + xa_for_each(&pin->dpll_refs, i, par_ref) + if (xa_get_mark(&dpll_device_xa, par_ref->dpll->id, + DPLL_REGISTERED)) + return true; + return false; +} + /** * dpll_device_change_ntf - notify that the dpll device has been changed * @dpll: registered dpll pointer @@ -579,7 +597,7 @@ 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 (!dpll_pin_available(pin)) return -ENODEV; msg = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); @@ -1130,6 +1148,10 @@ int dpll_nl_pin_id_get_doit(struct sk_buff *skb, struct genl_info *info) } pin = dpll_pin_find_from_nlattr(info); if (!IS_ERR(pin)) { + if (!dpll_pin_available(pin)) { + nlmsg_free(msg); + return -ENODEV; + } ret = dpll_msg_add_pin_handle(msg, pin); if (ret) { nlmsg_free(msg); @@ -1179,6 +1201,8 @@ int dpll_nl_pin_get_dumpit(struct sk_buff *skb, struct netlink_callback *cb) xa_for_each_marked_start(&dpll_pin_xa, i, pin, DPLL_REGISTERED, ctx->idx) { + if (!dpll_pin_available(pin)) + continue; hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &dpll_nl_family, NLM_F_MULTI, @@ -1441,7 +1465,8 @@ int dpll_pin_pre_doit(const struct genl_split_ops *ops, struct sk_buff *skb, } info->user_ptr[0] = xa_load(&dpll_pin_xa, nla_get_u32(info->attrs[DPLL_A_PIN_ID])); 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d="scan'208";a="788360418" Received: from amlin-018-114.igk.intel.com ([10.102.18.114]) by fmsmga007.fm.intel.com with ESMTP; 19 Jan 2024 05:46:22 -0800 From: Arkadiusz Kubalewski To: netdev@vger.kernel.org Cc: vadim.fedorenko@linux.dev, jiri@resnulli.us, davem@davemloft.net, milena.olech@intel.com, linux-kernel@vger.kernel.org, pabeni@redhat.com, kuba@kernel.org, mschmidt@redhat.com, Arkadiusz Kubalewski , Jan Glaza , Jiri Pirko Subject: [PATCH net v6 4/4] dpll: fix register pin with unregistered parent pin Date: Fri, 19 Jan 2024 14:43:04 +0100 Message-Id: <20240119134304.576956-5-arkadiusz.kubalewski@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> References: <20240119134304.576956-1-arkadiusz.kubalewski@intel.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: kuba@kernel.org 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 Reviewed-by: Jiri Pirko Signed-off-by: Arkadiusz Kubalewski --- v6: - no changes, bump the series version drivers/dpll/dpll_core.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/drivers/dpll/dpll_core.c b/drivers/dpll/dpll_core.c index cb62696467d1..5152bd1b0daf 100644 --- a/drivers/dpll/dpll_core.c +++ b/drivers/dpll/dpll_core.c @@ -29,8 +29,6 @@ static u32 dpll_pin_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)) struct dpll_device_registration { struct list_head list; @@ -616,8 +614,6 @@ 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 && @@ -695,8 +691,6 @@ 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);