From patchwork Wed Jul 31 20:14:01 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Rob Herring \(Arm\)" X-Patchwork-Id: 815801 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 9FEF816C6B5; Wed, 31 Jul 2024 20:14:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722456883; cv=none; b=C35X1M6j82a0y8/ujW+phElx6oR5iQEiSfjhjdJBVMuX6B14vRb8WUPvQSPo1UuRu9r1nChLu+upv57HjwAmpNg/n5EFL9NJVGyAH4D71aaUBjtujLWVAo0JxHKe9i45uVsKF4G6ZlcQ9eQFjlYeT/DjPuf43pDqdwLFuMAz4jM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722456883; c=relaxed/simple; bh=oJGAtAHYW6J5L4jx2/Dh0v9aVLJrCw5LhgkmOC6rItM=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=r10XXzr9eg7TtsR2Gb+FCQXspWFAtCoDl2lfdR2ZuXOfj1C7HEaNeMCRZTtWoiLvDVRxZ1gyWczI2ZBSzpnFnG7XJLlkO9H4flWvRh2ZyZisyVDaGI2iS67t/jvjtlctjV0rsVlffgMPReiUoJJ4CMzV5HdL56BIXIWsDj6TkmA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jeMcF3Pt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="jeMcF3Pt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5325DC4AF0C; Wed, 31 Jul 2024 20:14:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722456883; bh=oJGAtAHYW6J5L4jx2/Dh0v9aVLJrCw5LhgkmOC6rItM=; h=From:To:Cc:Subject:Date:From; b=jeMcF3PtJ+DxggC/AT6CnpH4gsTnjuC3wUxRDbu1cWWob1QUbEUb9XYXDsOQnszMJ ej21lvwHzaU+i9FxOkXg0RaN/SHXn3QUMFHleZi2r25mPl5xstWdhbRWmfYBrOvkzE jZYOHMGZuUErxLw6UTac7HRR+JmCA8rAgIjroyLnL2GJUD9DTjJoHNli61TrrLiXu7 p9IuvJi3q6nyaSIHxY0RFJngGe2LRMYGi5+l6Oh6hTP7lx4kBUc95UXseBwexBO8ap 8kZrt0+Rh/4YenPZA2/Z9cTrMxBxE4OmMzGpvZiyDoXBxlhds3qvjEW8zeYuBKtWmi oxiAwz+uV0ZKA== From: "Rob Herring (Arm)" To: Laxman Dewangan , Dmitry Torokhov , Thierry Reding , Jonathan Hunter Cc: linux-input@vger.kernel.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] input: tegra: Use of_property_read_variable_u32_array() and of_property_present() Date: Wed, 31 Jul 2024 14:14:01 -0600 Message-ID: <20240731201407.1838385-6-robh@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-input@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 There's no need to get the length of an DT array property before parsing the array. of_property_read_variable_u32_array() takes a minimum and maximum length and returns the actual length (or error code). This is part of a larger effort to remove callers of of_get_property() and similar functions. of_get_property() leaks the DT property data pointer which is a problem for dynamically allocated nodes which may be freed. Acked-by: Thierry Reding --- drivers/input/keyboard/tegra-kbc.c | 72 +++++++++++------------------- 1 file changed, 27 insertions(+), 45 deletions(-) diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c index a1765ed8c825..53f39fc155ea 100644 --- a/drivers/input/keyboard/tegra-kbc.c +++ b/drivers/input/keyboard/tegra-kbc.c @@ -491,12 +491,10 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc) struct device_node *np = kbc->dev->of_node; u32 prop; int i; - u32 num_rows = 0; - u32 num_cols = 0; + int num_rows; + int num_cols; u32 cols_cfg[KBC_MAX_GPIO]; u32 rows_cfg[KBC_MAX_GPIO]; - int proplen; - int ret; if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop)) kbc->debounce_cnt = prop; @@ -510,56 +508,23 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc) of_property_read_bool(np, "nvidia,wakeup-source")) /* legacy */ kbc->wakeup = true; - if (!of_get_property(np, "nvidia,kbc-row-pins", &proplen)) { - dev_err(kbc->dev, "property nvidia,kbc-row-pins not found\n"); - return -ENOENT; - } - num_rows = proplen / sizeof(u32); - - if (!of_get_property(np, "nvidia,kbc-col-pins", &proplen)) { - dev_err(kbc->dev, "property nvidia,kbc-col-pins not found\n"); - return -ENOENT; - } - num_cols = proplen / sizeof(u32); - - if (num_rows > kbc->hw_support->max_rows) { - dev_err(kbc->dev, - "Number of rows is more than supported by hardware\n"); - return -EINVAL; - } - - if (num_cols > kbc->hw_support->max_columns) { - dev_err(kbc->dev, - "Number of cols is more than supported by hardware\n"); - return -EINVAL; - } - - if (!of_get_property(np, "linux,keymap", &proplen)) { + if (!of_property_present(np, "linux,keymap")) { dev_err(kbc->dev, "property linux,keymap not found\n"); return -ENOENT; } - if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) { - dev_err(kbc->dev, - "keypad rows/columns not properly specified\n"); - return -EINVAL; - } - /* Set all pins as non-configured */ for (i = 0; i < kbc->num_rows_and_columns; i++) kbc->pin_cfg[i].type = PIN_CFG_IGNORE; - ret = of_property_read_u32_array(np, "nvidia,kbc-row-pins", - rows_cfg, num_rows); - if (ret < 0) { + num_rows = of_property_read_variable_u32_array(np, "nvidia,kbc-row-pins", + rows_cfg, 1, KBC_MAX_GPIO); + if (num_rows < 0) { dev_err(kbc->dev, "Rows configurations are not proper\n"); - return -EINVAL; - } - - ret = of_property_read_u32_array(np, "nvidia,kbc-col-pins", - cols_cfg, num_cols); - if (ret < 0) { - dev_err(kbc->dev, "Cols configurations are not proper\n"); + return num_rows; + } else if (num_rows > kbc->hw_support->max_rows) { + dev_err(kbc->dev, + "Number of rows is more than supported by hardware\n"); return -EINVAL; } @@ -568,11 +533,28 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc) kbc->pin_cfg[rows_cfg[i]].num = i; } + num_cols = of_property_read_variable_u32_array(np, "nvidia,kbc-col-pins", + cols_cfg, 1, KBC_MAX_GPIO); + if (num_cols < 0) { + dev_err(kbc->dev, "Cols configurations are not proper\n"); + return num_cols; + } else if (num_cols > kbc->hw_support->max_columns) { + dev_err(kbc->dev, + "Number of cols is more than supported by hardware\n"); + return -EINVAL; + } + for (i = 0; i < num_cols; i++) { kbc->pin_cfg[cols_cfg[i]].type = PIN_CFG_COL; kbc->pin_cfg[cols_cfg[i]].num = i; } + if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) { + dev_err(kbc->dev, + "keypad rows/columns not properly specified\n"); + return -EINVAL; + } + return 0; }