From patchwork Mon Jan 1 17:26:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13508677 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 016AC8F53; Mon, 1 Jan 2024 17:27:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="O3CC1pqf" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 568B1C433C9; Mon, 1 Jan 2024 17:27:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1704130078; bh=yHh7Ukk/gncI2TSG9Nwgs+QDiz5O22DFmxXXUEhspps=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O3CC1pqfGXaUQm+C6y6zZkQWy8YCQ/7NNLOGJF51147En/lqKkhZEsf4xFvdOf7Do 7D5nJgg9GdaMVZyR7h9kBBfI475n+U0SdcHAFPQoo1rIJBDqn8bWemLsHIfjqyBJ56 TfJsagWKsFXa6rxUb7eDw94N75M8+69j9a3mo75EUfZ/0sxEtGANTHqtq9znqRKrnv Q0GNZKb2pnVuxQV6qwSW87iiGe9JtkSHDAXf538o7X4UUhU+uVrv7Di+NHtpf85cCm GQgnTscvISTYet9IqUK1/Y8Z0y9sOGeYa8WWThMdsWu1TK1mTqVlXxcGYaIUV2lKaF YV7UnDbVLPsbQ== From: Jonathan Cameron To: linux-iio@vger.kernel.org, "Rafael J . Wysocki" , Len Brown , linux-acpi@vger.kernel.org, Andy Shevchenko , Greg Kroah-Hartman , Daniel Scally , Heikki Krogerus , Sakari Ailus Cc: =?utf-8?q?Nuno_S=C3=A1?= , Cosmin Tanislav , Mihail Chindris , Rasmus Villemoes , Tomislav Denis , Marek Vasut , Olivier Moysan , Fabrice Gasnier , Lad Prabhakar , Dmitry Baryshkov , Marijn Suijten , Marius Cristea , Ibrahim Tilki , Jonathan Cameron Subject: [RFC PATCH 12/13] iio: dac: ltc2688: Use __free(fwnode_handle) to replace fwnode_handle_put() calls Date: Mon, 1 Jan 2024 17:26:10 +0000 Message-ID: <20240101172611.694830-13-jic23@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240101172611.694830-1-jic23@kernel.org> References: <20240101172611.694830-1-jic23@kernel.org> Precedence: bulk X-Mailing-List: linux-iio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: Jonathan Cameron This use of the new cleanup.h scope based freeing infrastructure allows us to exit directly from error conditions within the device_for_each_child_node(dev, child) loop. On normal exit from that loop no fwnode_handle reference will be held and the child pointer will be NULL thus making the automatically run fwnode_handle_put() a noop. Signed-off-by: Jonathan Cameron Cc: Nuno Sá --- drivers/iio/dac/ltc2688.c | 23 ++++++----------------- 1 file changed, 6 insertions(+), 17 deletions(-) diff --git a/drivers/iio/dac/ltc2688.c b/drivers/iio/dac/ltc2688.c index fc8eb53c65be..e8add3636af9 100644 --- a/drivers/iio/dac/ltc2688.c +++ b/drivers/iio/dac/ltc2688.c @@ -746,7 +746,7 @@ static int ltc2688_span_lookup(const struct ltc2688_state *st, int min, int max) static int ltc2688_channel_config(struct ltc2688_state *st) { struct device *dev = &st->spi->dev; - struct fwnode_handle *child; + struct fwnode_handle *child __free(fwnode_handle) = NULL; u32 reg, clk_input, val, tmp[2]; int ret, span; @@ -754,18 +754,14 @@ static int ltc2688_channel_config(struct ltc2688_state *st) struct ltc2688_chan *chan; ret = fwnode_property_read_u32(child, "reg", ®); - if (ret) { - fwnode_handle_put(child); + if (ret) return dev_err_probe(dev, ret, "Failed to get reg property\n"); - } - if (reg >= LTC2688_DAC_CHANNELS) { - fwnode_handle_put(child); + if (reg >= LTC2688_DAC_CHANNELS) return dev_err_probe(dev, -EINVAL, "reg bigger than: %d\n", LTC2688_DAC_CHANNELS); - } val = 0; chan = &st->channels[reg]; @@ -786,12 +782,10 @@ static int ltc2688_channel_config(struct ltc2688_state *st) if (!ret) { span = ltc2688_span_lookup(st, (int)tmp[0] / 1000, tmp[1] / 1000); - if (span < 0) { - fwnode_handle_put(child); + if (span < 0) return dev_err_probe(dev, -EINVAL, "output range not valid:[%d %d]\n", tmp[0], tmp[1]); - } val |= FIELD_PREP(LTC2688_CH_SPAN_MSK, span); } @@ -800,17 +794,14 @@ static int ltc2688_channel_config(struct ltc2688_state *st) &clk_input); if (!ret) { if (clk_input >= LTC2688_CH_TGP_MAX) { - fwnode_handle_put(child); return dev_err_probe(dev, -EINVAL, "toggle-dither-input inv value(%d)\n", clk_input); } ret = ltc2688_tgp_clk_setup(st, chan, child, clk_input); - if (ret) { - fwnode_handle_put(child); + if (ret) return ret; - } /* * 0 means software toggle which is the default mode. @@ -844,11 +835,9 @@ static int ltc2688_channel_config(struct ltc2688_state *st) ret = regmap_write(st->regmap, LTC2688_CMD_CH_SETTING(reg), val); - if (ret) { - fwnode_handle_put(child); + if (ret) return dev_err_probe(dev, -EINVAL, "failed to set chan settings\n"); - } } return 0;