From nobody Thu Oct 2 19:26:01 2025 Received: from mail-oa1-f51.google.com (mail-oa1-f51.google.com [209.85.160.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6B413203A1 for ; Fri, 12 Sep 2025 16:07:04 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.51 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757693226; cv=none; b=ehIqkVjFyq1Vw9GivLOhMfSNGIa35Sitnv1yvnMsoTP21v5mS5GsMmJ7ZUQTg4avfGvg5Cdwm6OijmplVx8nIr6NRTtqpW6vqVzbXFXk/jwvWIhPDRfiC21h9w6WLW1LzkHBF7yTIqK4smHrnUpZkhaW7fwKae8+MJQxy7C8lGY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757693226; c=relaxed/simple; bh=6mdeYyd3hF07QuqGuLzQcOwjnfUK2lpqXDhP/AFlcKY=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=XtrBM/x9XX3+jtu6GwfJB1UlcUJ161PhbiZ0jZwbWcFKyjLdvGk/BwIMm8ofi7KDk/ntE4jl0/dgSCaLnZReH+bi5XeD0iLqqwDpp5a1/AIDZ6yXuLz5Qqa8R6XEexxFhAuqrXuqB5LHMQ6TZr24JWWaJ5v8WjI6ShAgsjgfo+A= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com; spf=pass smtp.mailfrom=baylibre.com; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b=QNWfob5h; arc=none smtp.client-ip=209.85.160.51 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=baylibre.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=baylibre.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=baylibre-com.20230601.gappssmtp.com header.i=@baylibre-com.20230601.gappssmtp.com header.b="QNWfob5h" Received: by mail-oa1-f51.google.com with SMTP id 586e51a60fabf-30cce5be7d0so938924fac.0 for ; Fri, 12 Sep 2025 09:07:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20230601.gappssmtp.com; s=20230601; t=1757693224; x=1758298024; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=zuUiBdYdOzhT/4QysYZeoKXL89SuD8knZroyb1BNveM=; b=QNWfob5hlgs+iSq2tLGvg8BMd5u7DiHKyG0C1yQK65FRgbGO8j+vqpQB8VAbceB35B byGlej9vPgpJPPN4LtA7uR8GKB/ZOXtl0OYPKHbpRnwYbRYo7WaTLvbbI36rXYVeF72z AhcEFm8xNltkGc8fbv2m8T8sMLRcTeNwJx9WcWPhPC5Q5kdhH+wb1dVNK0EdA5gCJOc1 Jk0zzJBfBz4fpIJa3UrQ+ReCZQ8vTadFcqpUCu1JUiWM1BYdGKy0fZ7WG76FbeVQ94hs NGFdpHcQzgM9pIBrCiI3uRyuyomgpy1X9eKvNWTqHptkidTsg0L9CB1s8hzSbZCPpm0w aQGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757693224; x=1758298024; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=zuUiBdYdOzhT/4QysYZeoKXL89SuD8knZroyb1BNveM=; b=pRMDSqu7erzQa0jARfmxNB+AZyWWHtnha4PWVa3K77PfZD/Mf7jh4LbTELdHzMFl5v /+s3DMZdAsbus1jJ7Gur3v1ONYxAazb7VLeVmeypTNlapo93JrJn/XSKpxDa8jWX1PxW 23VjjEVfQUe9rZYwhVK8utrw/3/EcNGfFExykfH7eSQH/G1aKaXY+rk8pKWFdqikL4X2 nO+YCYLEWq/Vg4a/9Vn1LNf6B5w1r99ay0lNEz/ItNALEGxmZIATr2kXjMwOqYxoZtLK +tl3DCp8tkvHsU+40oAO9Qf5mPmIwH9ZUbMtXiPalwBwGkbCZ8o86D5G3xdvgp6XXQTn ShuQ== X-Forwarded-Encrypted: i=1; AJvYcCXo52N7YOlJQ56azDpKmhJb8KJmHjBSSypcotEnK5cDycUAo36EmwNlKsueDLJ8QyyGCDZgkKnG2ooOth0=@vger.kernel.org X-Gm-Message-State: AOJu0Yz9Zs11Q1UBlVrJK+YcRj7YXt1Oagtvm6P+kiZwP98Qowr6yBY/ INOv6792slYCxtWlvHAZm6hG/E01NhCj9ZGeoMmsbTYy+o598du/SAOEEwQCtChrVQY= X-Gm-Gg: ASbGncsV8jkk1I/nqTocYedcEEfrnSXlktmGp2a0ODdRJM97X3OL4HZaXmefx7EusZo Y6WHpxexRS1vzkAv9bZ0CFSlRyu4YkSB/sDSieU8ytkdbPRUD8RpyxVaV+Y/SOyKe04W8Bnmpbr oCrpO84SpqyIXOa8QQYu97dv/P6zSfViD3qXr23/1umPrlnWymCmr/Ox/JyA0NNU7V54KCN20Mi fSsiKh5Mic2km/vK94EcMgCY1AIeI7VsnY20PdGDHtuY3Sn6pIqtxAEQzDgQvOBQbz3Wkf5/2u/ PLo74+XT3PMfh2gXlVqOd9tGVLb15/e4nv5gvjjyrbZ6T7vniJ3jNjCGKZ+SrMv9tFs8KFhcjFc DG53hUBfYPUjv7dZ4TWtgRhRD019fmI0VBDt2kws= X-Google-Smtp-Source: AGHT+IEece21/Wf69nhlOq5vMROWm4ROwTKSNf9dUQSOL8WXvaC/Qb5i7szMjnhXT8f3xk0bFvp93A== X-Received: by 2002:a05:6870:2c85:b0:321:2521:5a5 with SMTP id 586e51a60fabf-32e54e819e4mr1773625fac.3.1757693223831; Fri, 12 Sep 2025 09:07:03 -0700 (PDT) Received: from [127.0.1.1] ([2600:8803:e7e4:1d00:fdf1:f11e:e330:d3c1]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7524b8a39ecsm1073863a34.23.2025.09.12.09.07.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 09:07:03 -0700 (PDT) From: David Lechner Date: Fri, 12 Sep 2025 11:05:58 -0500 Subject: [PATCH 7/7] iio: buffer: document that buffer callback must be context safe Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250912-iio-doc-push-to-buffers-context-v1-7-c4aad013d96e@baylibre.com> References: <20250912-iio-doc-push-to-buffers-context-v1-0-c4aad013d96e@baylibre.com> In-Reply-To: <20250912-iio-doc-push-to-buffers-context-v1-0-c4aad013d96e@baylibre.com> To: Jonathan Cameron , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Daniel Lezcano , David Lechner X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1632; i=dlechner@baylibre.com; h=from:subject:message-id; bh=6mdeYyd3hF07QuqGuLzQcOwjnfUK2lpqXDhP/AFlcKY=; b=owEBbQGS/pANAwAKAcLMIAH/AY/AAcsmYgBoxEUR8jVNgAKhSyBxjAa9rQh/UHfJqz4WQGOwp ZIh/TBlDxGJATMEAAEKAB0WIQTsGNmeYg6D1pzYaJjCzCAB/wGPwAUCaMRFEQAKCRDCzCAB/wGP wOXcCACTtCM3r5X/VEpmrprum2PMSTKqs3GgI14iesumjCXuij/5jAx9itvCr3iVjiQBB2baOLr n3TMcn6Ul7FkEzmhaVJ1bhuxLSHoBudhpegwiPfKCO2dElYRpX4MT09wJnGDsFStDhw9rt1JpnJ QWyfbeZsRf1mV1ypVNBPyMiWvRzfMLOqDeEhltTry/9FhODX7O97GUSv7VqjFIB45S2u0PqflYX WZbLoe+8bHou1Y/EBJQ6yYmzQY6YVI0vGsm5StKl4AKIik2MkCPtUA/HQSBhmO/nT3BXsKWgism wR4iFNm6YJWfQrUOjhmN0f0ttZ9/alP3C+Xq2Bi6zcznM+hW X-Developer-Key: i=dlechner@baylibre.com; a=openpgp; fpr=8A73D82A6A1F509907F373881F8AF88C82F77C03 Document that the callback registered with iio_channel_get_all_cb() must be safe to call from any context since it is called from by iio_push_to_buffer() which can be called in any context. Signed-off-by: David Lechner --- drivers/iio/buffer/industrialio-buffer-cb.c | 1 + include/linux/iio/consumer.h | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/iio/buffer/industrialio-buffer-cb.c b/drivers/iio/buff= er/industrialio-buffer-cb.c index 3e27385069edb5b717a4c56e72dff2c0a238fa07..f4ebff9684936365ec179489d90= 41d8bdbe58738 100644 --- a/drivers/iio/buffer/industrialio-buffer-cb.c +++ b/drivers/iio/buffer/industrialio-buffer-cb.c @@ -13,6 +13,7 @@ =20 struct iio_cb_buffer { struct iio_buffer buffer; + /* Must be safe to call from any context (e.g. must not sleep). */ int (*cb)(const void *data, void *private); void *private; struct iio_channel *channels; diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h index a38b277c2c02cb85a766d645a046bdfa534db51a..5039558267e4c17b2e09246036d= 0df352e242d06 100644 --- a/include/linux/iio/consumer.h +++ b/include/linux/iio/consumer.h @@ -131,7 +131,8 @@ struct iio_cb_buffer; /** * iio_channel_get_all_cb() - register callback for triggered capture * @dev: Pointer to client device. - * @cb: Callback function. + * @cb: Callback function. Must be safe to call from any context + * (e.g. must not sleep). * @private: Private data passed to callback. * * NB right now we have no ability to mux data from multiple devices. --=20 2.43.0