From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id F2E67C44503 for ; Wed, 8 Jul 2026 09:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=EFSMF/UUQ/jmj4LT03D5ukygscU0JNIQNzF2vvZDJ4k=; b=EJoxsd+WDBTXKgKU+zEymVMz3H +YqLvDnNXo1kYDjoN3K1f+hYVSOl5ruZZKSf9YyCjY8y1TcyFn3QCV1F/maFZsxxjFkpsjS0sycJM sgA5E1mSuA7bUI4kHh3NedoQYrvztv3pCCnaJn4az653Vl5RXWN59dM1WZn00U077hIPffLZ42Ivt ayarAou08kpw+/ATSeQo8aKv4DZAPw7Es6oIcvwRpHhG2MsmsMnllc4VaiwhKt+wQcJTTCoxQFvfL BKDxxYnx+PhYFrVtHBPKEof8K5AJt1yA9/bkhtlykRnQR9AwbWyDW0AzcLyWK/gDm3RIHlprx2+S+ vz+j66Iw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1whO8x-0000000GfyW-1evl; Wed, 08 Jul 2026 09:00:35 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1whO8s-0000000Gfvx-2qVU for linux-arm-kernel@lists.infradead.org; Wed, 08 Jul 2026 09:00:30 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 247DA6001A; Wed, 8 Jul 2026 09:00:30 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 484021F00A3D; Wed, 8 Jul 2026 09:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1783501229; bh=EFSMF/UUQ/jmj4LT03D5ukygscU0JNIQNzF2vvZDJ4k=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=fm96ya9Lx5ykmSLDc5Dq5mu/CNPVnbAUim/eDPtYdyc7gh+RRv4aLruwZzcXf6g60 r0b3R3jjv6ysiwddJGZd3vsjESEz3LmgjOohoHsvFpsGoqX+hjk6IC/WgwNPIUf+8h g9UZcOTAnezryqMUAiQ/4hibQ5UjSJU2Y8xiDqMvQxd8v1Ow2TdBL8JlZU2Z49BSMi 4S2hXlmM86EbAZedfZWXxYazN3YRI8ehkFCsFp1PmGAjCH+YminAjLA8GRnF/shUWL QV+uCiltELxIfbwZVTp92gZIJZrRveVWPhxRfsqM0ZEG8SBXxB0lwC0LM3G30RsfR7 yMYsA6rPf0Adw== From: Sudeep Holla Date: Wed, 08 Jul 2026 10:00:01 +0100 Subject: [PATCH v4 05/16] firmware: arm_scmi: Avoid IDR updates while cleaning channels MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260708-scmi_core_fixes-v4-5-53142cd60b63@kernel.org> References: <20260708-scmi_core_fixes-v4-0-53142cd60b63@kernel.org> In-Reply-To: <20260708-scmi_core_fixes-v4-0-53142cd60b63@kernel.org> To: arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Cristian Marussi X-Mailer: b4 0.15.2 X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction. Fixes: 05a2801d8b90 ("firmware: arm_scmi: Use dedicated devices to initialize channels") Reported-by: Sashiko Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/driver.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 9428c0777899..3b0c8b6087e6 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -2885,7 +2885,7 @@ static int scmi_channels_setup(struct scmi_info *info) return 0; } -static int scmi_chan_destroy(int id, void *p, void *idr) +static int scmi_chan_destroy(int id, void *p, void *data) { struct scmi_chan_info *cinfo = p; @@ -2898,8 +2898,6 @@ static int scmi_chan_destroy(int id, void *p, void *idr) cinfo->dev = NULL; } - idr_remove(idr, id); - return 0; } -- 2.43.0