From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-174.mta1.migadu.com (out-174.mta1.migadu.com [95.215.58.174]) (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 18D8237CD5C; Tue, 9 Jun 2026 06:28:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.174 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780986501; cv=none; b=PBw42sfNis82ziDMUFXf0LiTMFHhzcuxHtatsg3KIm5r1jHeohV9ufU0sWswMFDVg8IK0mw2QDqoFkeDBAoihn2CxDRU0Eu6rZAOhHuL/CGFZkJrwc3qJSzqq4krmOWj+L7A3eyVCCgIzHP7JNdS3aV4aytxFGVtCTno8effyF8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780986501; c=relaxed/simple; bh=tgdrHdhK+p636FycCUzkm5akVwJSiiV7lY2q6FqL4EE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=euMv0+E3ra2Fqm2727KPV/R1FM5oiIhjJAE8dM6Oy7sZOQJj2oWGbA2qQ6PwGLd8P4epwZfotrdaXtrJb6PPAikF03EewLObPZ6+Cf5PO0vcGID4O+cqb4e4g97tbrY/NApSbmyZrCgWxm+cSQKw6dqTYVEUyPSWgE6Ko9AwWDo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=isl8KKJu; arc=none smtp.client-ip=95.215.58.174 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="isl8KKJu" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1780986497; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MR1hTzP95VNUKx7/pKpDVtm2601TjwJtZ4ASjUfdk1Y=; b=isl8KKJuAUNED6y7PqRYss/yrCZzRxABbNH7LLFjXBudV0mEVhbPjitoJS3k0/o1vcGfft s62so6ieDuNj/XVJ1vkk1Q7CcR4Ey2KkfWmakHlovNnr2LJm+7oGH2kB4IAdYCBbQxOFWn FuuaYym3pHtVPMmNAZdGoQnflBzoQlE= From: Kaitao Cheng To: Andy Shevchenko , Muchun Song , Philipp Reisner , Lars Ellenberg , =?UTF-8?q?Christoph=20B=C3=B6hmwalder?= , Jens Axboe , Takashi Sakamoto , Andrzej Hajda , Neil Armstrong , Robert Foss , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Jani Nikula , Joonas Lahtinen , Rodrigo Vivi , Tvrtko Ursulin , Christian Koenig , Huang Rui , Eddie James , Mark Brown , Maxime Coquelin , Alexandre Torgue , Laxman Dewangan , Thierry Reding , Jonathan Hunter , Sowjanya Komatineni , Davidlohr Bueso , "Paul E . McKenney" , Josh Triplett , Peter Zijlstra , Ingo Molnar , Will Deacon , Boqun Feng , Liam Girdwood , Jaroslav Kysela , Takashi Iwai Cc: Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Matthew Auld , Matthew Brost , Waiman Long , drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, linux1394-devel@lists.sourceforge.net, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, linux-spi@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-sound@vger.kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Randy Dunlap , Christian Brauner , David Howells , Luca Ceresoli , Kaitao Cheng , Kaitao Cheng Subject: [PATCH v2 08/14] spi: stm32-ospi: Open-code message transfer walk Date: Tue, 9 Jun 2026 14:25:20 +0800 Message-ID: <20260609062526.94907-6-kaitao.cheng@linux.dev> In-Reply-To: <20260609062526.94907-1-kaitao.cheng@linux.dev> References: <20260609061347.93688-1-kaitao.cheng@linux.dev> <20260609062526.94907-1-kaitao.cheng@linux.dev> Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Kaitao Cheng A later change will make list_for_each_entry() cache the next element before entering the loop body. stm32_ospi_transfer_one_message() can consume the following transfer as part of the current operation and then advance the loop cursor to that entry. Keep the transfer walk open-coded so the loop step observes that cursor update and skips the consumed transfer. This preserves the existing message sequencing semantics and prepares the code for the list iterator update. Signed-off-by: Kaitao Cheng --- drivers/spi/spi-stm32-ospi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-stm32-ospi.c b/drivers/spi/spi-stm32-ospi.c index 4461c6e24b9e..4dc2b56b4c20 100644 --- a/drivers/spi/spi-stm32-ospi.c +++ b/drivers/spi/spi-stm32-ospi.c @@ -675,7 +675,9 @@ static int stm32_ospi_transfer_one_message(struct spi_controller *ctrl, gpiod_set_value_cansleep(cs_gpiod, true); - list_for_each_entry(transfer, &msg->transfers, transfer_list) { + for (transfer = list_first_entry(&msg->transfers, typeof(*transfer), transfer_list); + !list_entry_is_head(transfer, &msg->transfers, transfer_list); + transfer = list_next_entry(transfer, transfer_list)) { u8 dummy_bytes = 0; memset(&op, 0, sizeof(op)); -- 2.43.0