From patchwork Thu Jan 4 11:11:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Arkadiusz Kubalewski X-Patchwork-Id: 13511020 X-Patchwork-Delegate: kuba@kernel.org Received: from mgamail.intel.com (mgamail.intel.com [134.134.136.126]) (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 020D9210F3 for ; Thu, 4 Jan 2024 11:15:08 +0000 (UTC) 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="BuKRQccN" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1704366908; x=1735902908; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=01oIGEc6Ohy6Rpabg8fxapMCJ78or9cM1DwlMsM2U/g=; b=BuKRQccNk7etufrmfkdjFLUVbE7EYUzo4obRSmptJ17xdUu+Y1qmvecc wDfB6RJ21a9AlD+/xTaVIdjoc5j14rqBinkgHpPLOd3FSqNgOg6++xaTc PSQYc/85AbRUW6NFMlBtRB7yD61nSK+9tTi3Rk5f2vkPlL9ZzOP8D1JXI wz2tLcejp7OLQRz6nThvBuXrsYSl0y2LuUFCnM8TLje/5TmP6MkT4fTWP q9izbhvUhEX6zN2ddQtiktVzyufFUbT0jN5xr+7fRlhyKrerQOczNDV1c XMucM3NxnzmePt9n+L3oXBPXc7othkMvoPiOZVvWY0s6jrOVBqgu7vWDm w==; X-IronPort-AV: E=McAfee;i="6600,9927,10942"; a="382174463" X-IronPort-AV: E=Sophos;i="6.04,330,1695711600"; d="scan'208";a="382174463" Received: from fmsmga006.fm.intel.com ([10.253.24.20]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Jan 2024 03:15:08 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10942"; a="1027391611" X-IronPort-AV: E=Sophos;i="6.04,330,1695711600"; d="scan'208";a="1027391611" Received: from amlin-018-114.igk.intel.com ([10.102.18.114]) by fmsmga006.fm.intel.com with ESMTP; 04 Jan 2024 03:15:06 -0800 From: Arkadiusz Kubalewski To: netdev@vger.kernel.org Cc: vadim.fedorenko@linux.dev, jiri@resnulli.us, michal.michalik@intel.com, milena.olech@intel.com, pabeni@redhat.com, kuba@kernel.org, Arkadiusz Kubalewski , Jan Glaza Subject: [PATCH net v2 4/4] dpll: hide "zombie" pins for userspace Date: Thu, 4 Jan 2024 12:11:32 +0100 Message-Id: <20240104111132.42730-5-arkadiusz.kubalewski@intel.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20240104111132.42730-1-arkadiusz.kubalewski@intel.com> References: <20240104111132.42730-1-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 parent pin was unregistered but child pin was not, the userspace would see the "zombie" pins - the ones that were registered with parent pin (pins_pin_on_pin_register(..)). 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. Fixes: 9431063ad323 ("dpll: core: Add DPLL framework base functions") Fixes: 9d71b54b65b1 ("dpll: netlink: Add DPLL framework base functions") Reviewed-by: Jan Glaza Signed-off-by: Arkadiusz Kubalewski --- drivers/dpll/dpll_netlink.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/drivers/dpll/dpll_netlink.c b/drivers/dpll/dpll_netlink.c index f266db8da2f0..495dfc43c0be 100644 --- a/drivers/dpll/dpll_netlink.c +++ b/drivers/dpll/dpll_netlink.c @@ -949,6 +949,19 @@ dpll_pin_parent_pin_set(struct dpll_pin *pin, struct nlattr *parent_nest, return 0; } +static bool dpll_pin_parents_registered(struct dpll_pin *pin) +{ + struct dpll_pin_ref *par_ref; + struct dpll_pin *p; + unsigned long i, j; + + xa_for_each(&pin->parent_refs, i, par_ref) + xa_for_each_marked(&dpll_pin_xa, j, p, DPLL_REGISTERED) + if (par_ref->pin == p) + return true; + return false; +} + static int dpll_pin_set_from_nlattr(struct dpll_pin *pin, struct genl_info *info) { @@ -1153,6 +1166,9 @@ 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 (!xa_empty(&pin->parent_refs) && + !dpll_pin_parents_registered(pin)) + continue; hdr = genlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, &dpll_nl_family, NLM_F_MULTI, @@ -1179,6 +1195,10 @@ int dpll_nl_pin_set_doit(struct sk_buff *skb, struct genl_info *info) { struct dpll_pin *pin = info->user_ptr[0]; + if (!xa_empty(&pin->parent_refs) && + !dpll_pin_parents_registered(pin)) + return -ENODEV; + return dpll_pin_set_from_nlattr(pin, info); }