From patchwork Sun Jan 28 15:05:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 13534498 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 6F0A323757 for ; Sun, 28 Jan 2024 15:06:41 +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=1706454401; cv=none; b=HphS/xrFNYE2TQt5f9X9OLXd01nWtqc+CMWHD2Y0QHDUBPEZ3NAaSwcHM7wTAeLpUFTUs5A/CCT0f7qoNrZl/PuPuXJpxfQmqm5L6Gtob5Tsx6KVQdIDmbPBZhXkXbHJVPRyqXmBjoK8TDU20QiZ60v5qIf7kWY0l5HB2a+ui9o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706454401; c=relaxed/simple; bh=Tyw9IgBVo8lfW/bCa8pQw4pHUsXzqR8Qcl3Mb+jAf8M=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=GXNTpPFRPTV3qNI8TXxgQiX9DQQPDfRTzmHoyVKef60Z6EbKTBjD2J3HTqn3CChhx3LpsZQUthVl5buewewjHvEv9jusoBesb6dpX5tQQjlrgku9NDRMfH7YOYBEShFP4rNsVpznAazUV0qlb5ZfNAYnqRD+DaHlUeG9MFlI+TQ= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=PCpvEbZV; 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="PCpvEbZV" Received: by smtp.kernel.org (Postfix) with ESMTPSA id BBDB0C433C7; Sun, 28 Jan 2024 15:06:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1706454400; bh=Tyw9IgBVo8lfW/bCa8pQw4pHUsXzqR8Qcl3Mb+jAf8M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PCpvEbZVl9wlhkayoppQYuA42P63nD5ZF5OgnEnjDOODCCWBF7arQYV9Un81my34/ vV3LWp1aRxTEkq6K+FB5i1QbF4L3lkYKx+MGVaw9P8dUgRXYjc7jLm2Vi9qTIydabT sTdBOf6f79NKvThmwSZOVFSAD1LO0oYY0lqRW/nL9NjR+xrinur49wYzr4GmV+fB6n NDcfE+TB2BTK1CCi6y4svkUwD4jZMdbMmbvFUjXAuMbI/LzbUZH1Q/5Hi69mvWFwoZ KzgZgTZC6MkTVdqPLo71DPfIBLjiWXAVoDtADXGWI6DjicRlOA3hAdCv89k1sqwgJM CFj0GtroYqNRQ== From: Jonathan Cameron To: linux-iio@vger.kernel.org Cc: David Lechner , Peter Zijlstra , Jonathan Cameron Subject: [PATCH 08/10] iio: proximity: sx9310: Use automated cleanup for locks and IIO mode claiming. Date: Sun, 28 Jan 2024 15:05:35 +0000 Message-ID: <20240128150537.44592-9-jic23@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240128150537.44592-1-jic23@kernel.org> References: <20240128150537.44592-1-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 simplifies error handling paths and generallly removes a bunch of boilerplate. Signed-off-by: Jonathan Cameron --- Since RFC: - Use unreachable() to convince compiler of paths we can't get to rather than adding pointless returns. --- drivers/iio/proximity/sx9310.c | 114 +++++++++++---------------------- 1 file changed, 39 insertions(+), 75 deletions(-) diff --git a/drivers/iio/proximity/sx9310.c b/drivers/iio/proximity/sx9310.c index 0d230a0dff56..427c9343d6d1 100644 --- a/drivers/iio/proximity/sx9310.c +++ b/drivers/iio/proximity/sx9310.c @@ -337,28 +337,19 @@ static int sx9310_read_raw(struct iio_dev *indio_dev, int *val2, long mask) { struct sx_common_data *data = iio_priv(indio_dev); - int ret; if (chan->type != IIO_PROXIMITY) return -EINVAL; switch (mask) { case IIO_CHAN_INFO_RAW: - ret = iio_device_claim_direct_mode(indio_dev); - if (ret) - return ret; - - ret = sx_common_read_proximity(data, chan, val); - iio_device_release_direct_mode(indio_dev); - return ret; + iio_device_claim_direct_scoped(return -EBUSY, indio_dev) + return sx_common_read_proximity(data, chan, val); + unreachable(); case IIO_CHAN_INFO_HARDWAREGAIN: - ret = iio_device_claim_direct_mode(indio_dev); - if (ret) - return ret; - - ret = sx9310_read_gain(data, chan, val); - iio_device_release_direct_mode(indio_dev); - return ret; + iio_device_claim_direct_scoped(return -EBUSY, indio_dev) + return sx9310_read_gain(data, chan, val); + unreachable(); case IIO_CHAN_INFO_SAMP_FREQ: return sx9310_read_samp_freq(data, val, val2); default: @@ -546,12 +537,10 @@ static int sx9310_write_thresh(struct sx_common_data *data, return -EINVAL; regval = FIELD_PREP(SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval); - mutex_lock(&data->mutex); - ret = regmap_update_bits(data->regmap, reg, - SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval); - mutex_unlock(&data->mutex); - return ret; + guard(mutex)(&data->mutex); + return regmap_update_bits(data->regmap, reg, + SX9310_REG_PROX_CTRL8_9_PTHRESH_MASK, regval); } static int sx9310_write_hysteresis(struct sx_common_data *data, @@ -576,17 +565,14 @@ static int sx9310_write_hysteresis(struct sx_common_data *data, return -EINVAL; hyst = FIELD_PREP(SX9310_REG_PROX_CTRL10_HYST_MASK, hyst); - mutex_lock(&data->mutex); - ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, - SX9310_REG_PROX_CTRL10_HYST_MASK, hyst); - mutex_unlock(&data->mutex); - return ret; + guard(mutex)(&data->mutex); + return regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, + SX9310_REG_PROX_CTRL10_HYST_MASK, hyst); } static int sx9310_write_far_debounce(struct sx_common_data *data, int val) { - int ret; unsigned int regval; if (val > 0) @@ -596,18 +582,14 @@ static int sx9310_write_far_debounce(struct sx_common_data *data, int val) regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, val); - mutex_lock(&data->mutex); - ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, - SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, - regval); - mutex_unlock(&data->mutex); - - return ret; + guard(mutex)(&data->mutex); + return regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, + SX9310_REG_PROX_CTRL10_FAR_DEBOUNCE_MASK, + regval); } static int sx9310_write_close_debounce(struct sx_common_data *data, int val) { - int ret; unsigned int regval; if (val > 0) @@ -617,13 +599,10 @@ static int sx9310_write_close_debounce(struct sx_common_data *data, int val) regval = FIELD_PREP(SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, val); - mutex_lock(&data->mutex); - ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, - SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, - regval); - mutex_unlock(&data->mutex); - - return ret; + guard(mutex)(&data->mutex); + return regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL10, + SX9310_REG_PROX_CTRL10_CLOSE_DEBOUNCE_MASK, + regval); } static int sx9310_write_event_val(struct iio_dev *indio_dev, @@ -658,7 +637,7 @@ static int sx9310_write_event_val(struct iio_dev *indio_dev, static int sx9310_set_samp_freq(struct sx_common_data *data, int val, int val2) { - int i, ret; + int i; for (i = 0; i < ARRAY_SIZE(sx9310_samp_freq_table); i++) if (val == sx9310_samp_freq_table[i].val && @@ -668,23 +647,17 @@ static int sx9310_set_samp_freq(struct sx_common_data *data, int val, int val2) if (i == ARRAY_SIZE(sx9310_samp_freq_table)) return -EINVAL; - mutex_lock(&data->mutex); - - ret = regmap_update_bits( + guard(mutex)(&data->mutex); + return regmap_update_bits( data->regmap, SX9310_REG_PROX_CTRL0, SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, FIELD_PREP(SX9310_REG_PROX_CTRL0_SCANPERIOD_MASK, i)); - - mutex_unlock(&data->mutex); - - return ret; } static int sx9310_write_gain(struct sx_common_data *data, const struct iio_chan_spec *chan, int val) { unsigned int gain, mask; - int ret; gain = ilog2(val); @@ -703,12 +676,9 @@ static int sx9310_write_gain(struct sx_common_data *data, return -EINVAL; } - mutex_lock(&data->mutex); - ret = regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL3, mask, - gain); - mutex_unlock(&data->mutex); - - return ret; + guard(mutex)(&data->mutex); + return regmap_update_bits(data->regmap, SX9310_REG_PROX_CTRL3, mask, + gain); } static int sx9310_write_raw(struct iio_dev *indio_dev, @@ -969,22 +939,18 @@ static int sx9310_suspend(struct device *dev) disable_irq_nosync(data->client->irq); - mutex_lock(&data->mutex); + guard(mutex)(&data->mutex); ret = regmap_read(data->regmap, SX9310_REG_PROX_CTRL0, &data->suspend_ctrl); if (ret) - goto out; + return ret; ctrl0 = data->suspend_ctrl & ~SX9310_REG_PROX_CTRL0_SENSOREN_MASK; ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, ctrl0); if (ret) - goto out; - - ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 0); + return ret; -out: - mutex_unlock(&data->mutex); - return ret; + return regmap_write(data->regmap, SX9310_REG_PAUSE, 0); } static int sx9310_resume(struct device *dev) @@ -992,18 +958,16 @@ static int sx9310_resume(struct device *dev) struct sx_common_data *data = iio_priv(dev_get_drvdata(dev)); int ret; - mutex_lock(&data->mutex); - ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 1); - if (ret) - goto out; - - ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, - data->suspend_ctrl); + scoped_guard(mutex, &data->mutex) { + ret = regmap_write(data->regmap, SX9310_REG_PAUSE, 1); + if (ret) + return ret; -out: - mutex_unlock(&data->mutex); - if (ret) - return ret; + ret = regmap_write(data->regmap, SX9310_REG_PROX_CTRL0, + data->suspend_ctrl); + if (ret) + return ret; + } enable_irq(data->client->irq); return 0;