From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 BF04A169AD2; Tue, 16 Jun 2026 18:37:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781635056; cv=none; b=KeTGZOUIEuewG+Jpsy7iHDHwuYvQEQESou5+I6oh0lIQ/HzsT8P8/X5/5ltGhytviqVvpntnc7wfRCV8WjVZjFDXNz3axJ/7itVHmPRx2fABUjtG7+lCvZJb01end+niYENO8SzbLw6F3CF/ywo5a4GECmceO4skYJIC/N3mm88= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781635056; c=relaxed/simple; bh=9jpEKmG8l54DfobIcVu5ji0z1UEM6jJL2Pj1tvjLJz0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=IVCewvdvhn+mG5bZev0f07Pkm+1Ns7ajrYEexzQA7AwPJMhlSmVdUCieRIPBfjT2LytW3624u02EKTRE8wqXsildwmkllhRwCOs43kmUKhFMzKqvLkHiQXuAkwkIlTt0ExL1onsOifNVJ8o6de0RZuSftrXGSma4bh7y/rjHeU4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=en4lua9y; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="en4lua9y" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C16C31F000E9; Tue, 16 Jun 2026 18:37:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1781635055; bh=bMQLSLjW4mwfsOkk7TuGyMbngNDum6hdJlj1XRIDXfQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=en4lua9yDUOzjzYAly0wVMtOxztQBza0HfBgaWz9AOWMr2xTQNQeUwbqOfoExyx4i bbfjZ2E9737eTGuBL92ksStUKun908CZGJeGEr5njM9q+m2mLD0BuYCXd8gqxj7x/t aDcOnCs6O9hIrm4Yu9tfK/wzaMn9Hpm/VTZcgK7M= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, David Lechner , Tomasz Duszynski , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.15 365/411] iio: chemical: scd30: Use guard(mutex) to allow early returns Date: Tue, 16 Jun 2026 20:30:03 +0530 Message-ID: <20260616145120.735496116@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260616145100.376842714@linuxfoundation.org> References: <20260616145100.376842714@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jonathan Cameron [ Upstream commit 5feb5532870fbced5d6f450b8061a33f461b88ca ] Auto cleanup based release of the lock allows for simpler code flow in a few functions with large multiplexing style switch statements and no common operations following the switch. Suggested-by: David Lechner Cc: Tomasz Duszynski Reviewed-by: David Lechner Link: https://patch.msgid.link/20250209180624.701140-3-jic23@kernel.org Signed-off-by: Jonathan Cameron Stable-dep-of: 5aba4f94b225 ("iio: chemical: scd30: fix division by zero in write_raw") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/iio/chemical/scd30_core.c | 63 ++++++++++++++++---------------------- 1 file changed, 28 insertions(+), 35 deletions(-) --- a/drivers/iio/chemical/scd30_core.c +++ b/drivers/iio/chemical/scd30_core.c @@ -5,6 +5,7 @@ * Copyright (c) 2020 Tomasz Duszynski */ #include +#include #include #include #include @@ -198,112 +199,104 @@ static int scd30_read_raw(struct iio_dev int *val, int *val2, long mask) { struct scd30_state *state = iio_priv(indio_dev); - int ret = -EINVAL; + int ret; u16 tmp; - mutex_lock(&state->lock); + guard(mutex)(&state->lock); switch (mask) { case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_PROCESSED: if (chan->output) { *val = state->pressure_comp; - ret = IIO_VAL_INT; - break; + return IIO_VAL_INT; } ret = iio_device_claim_direct_mode(indio_dev); if (ret) - break; + return ret; ret = scd30_read(state); if (ret) { iio_device_release_direct_mode(indio_dev); - break; + return ret; } *val = state->meas[chan->address]; iio_device_release_direct_mode(indio_dev); - ret = IIO_VAL_INT; - break; + return IIO_VAL_INT; case IIO_CHAN_INFO_SCALE: *val = 0; *val2 = 1; - ret = IIO_VAL_INT_PLUS_MICRO; - break; + return IIO_VAL_INT_PLUS_MICRO; case IIO_CHAN_INFO_SAMP_FREQ: ret = scd30_command_read(state, CMD_MEAS_INTERVAL, &tmp); if (ret) - break; + return ret; *val = 0; *val2 = 1000000000 / tmp; - ret = IIO_VAL_INT_PLUS_NANO; - break; + return IIO_VAL_INT_PLUS_NANO; case IIO_CHAN_INFO_CALIBBIAS: ret = scd30_command_read(state, CMD_TEMP_OFFSET, &tmp); if (ret) - break; + return ret; *val = tmp; - ret = IIO_VAL_INT; - break; + return IIO_VAL_INT; + default: + return -EINVAL; } - mutex_unlock(&state->lock); - - return ret; } static int scd30_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { struct scd30_state *state = iio_priv(indio_dev); - int ret = -EINVAL; + int ret; - mutex_lock(&state->lock); + guard(mutex)(&state->lock); switch (mask) { case IIO_CHAN_INFO_SAMP_FREQ: if (val) - break; + return -EINVAL; val = 1000000000 / val2; if (val < SCD30_MEAS_INTERVAL_MIN_S || val > SCD30_MEAS_INTERVAL_MAX_S) - break; + return -EINVAL; ret = scd30_command_write(state, CMD_MEAS_INTERVAL, val); if (ret) - break; + return ret; state->meas_interval = val; - break; + return 0; case IIO_CHAN_INFO_RAW: switch (chan->type) { case IIO_PRESSURE: if (val < SCD30_PRESSURE_COMP_MIN_MBAR || val > SCD30_PRESSURE_COMP_MAX_MBAR) - break; + return -EINVAL; ret = scd30_command_write(state, CMD_START_MEAS, val); if (ret) - break; + return ret; state->pressure_comp = val; - break; + return 0; default: - break; + return -EINVAL; } - break; case IIO_CHAN_INFO_CALIBBIAS: if (val < 0 || val > SCD30_TEMP_OFFSET_MAX) - break; + return -EINVAL; /* * Manufacturer does not explicitly specify min/max sensible * values hence check is omitted for simplicity. */ - ret = scd30_command_write(state, CMD_TEMP_OFFSET / 10, val); + return scd30_command_write(state, CMD_TEMP_OFFSET / 10, val); + default: + return -EINVAL; } - mutex_unlock(&state->lock); - - return ret; } static int scd30_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,