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 E799936F8F1 for ; Tue, 14 Jul 2026 12:58:46 +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=1784033927; cv=none; b=lgevFqODmnLyh5ep644U7jBoJaZtLW18Zzj9ZIGkRCmwIb+x/8LkKFeMPDKCs2ZZw2muigTZD1OAv4HhZDUDL5OgxM/lP8PMYr9DlCRG50ZF+eZDRboTIZ9j+dju9dKgAHZzL8UUxqMxUbyGvvtN0+Vz8bit61GTD319xDbFi10= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784033927; c=relaxed/simple; bh=gD2Q9ewuklgYQfz6si8ulMqBzVM5BnAmk67HdniJV9w=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=lNFvp/wWnr0d1g+q25IGxMbbPFawf55RX5pLftIAfiOT+wACQwYrrP2UkDXOogWE+H3+SyH7w6rWdfIt+QteX5Ph3Vj0jDcqkEDHfsfeKoBJNNkHmNYbHOoRe75zWWIXGhCWiwpIN3N+6/7w0AjLXfm7wITJPvVo7zNAWCgInjU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=i06zBUzq; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="i06zBUzq" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EE2491F00A3F; Tue, 14 Jul 2026 12:58:45 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784033926; bh=L9WYDR5trI7p9S+Iac5p6xn9rhzelgxyQenxL6PczGQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=i06zBUzqpTcRsmR/gY2bqgX80JQDQoCjKlyqIRQhssBhkc/llgdwUvininXheC0xl JddpxC1r/5QaEKHNCMZh1UurUsPB8EMrD0Gqcc91EGtveliN+1EmjyDrEDeawegvQ+ JChazQmsRrpZI7xd+SVKBd3vbEQIL8hBbJkRQmPkmo+2SRIblK6yJjWDZCWmvFV88N Mw9BliiJcTPsUfVmdtd1xTrM84Cmg+eT88vxVjW4cWQPrOWZFDaovrAABjdaeoTVMA IKxfo1P+TIFOgKp7agXRWeKPaA2jmB3tgU2tQo4OWhDQhfyXY0dz9DNmLfG6zcAD6H CkIjATSyeFD+A== From: Sudeep Holla Date: Tue, 14 Jul 2026 13:56:28 +0100 Subject: [PATCH v6 09/16] firmware: arm_scmi: Protect device request lookup with RCU Precedence: bulk X-Mailing-List: arm-scmi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260714-scmi_core_fixes-v6-9-3afe499d46e3@kernel.org> References: <20260714-scmi_core_fixes-v6-0-3afe499d46e3@kernel.org> In-Reply-To: <20260714-scmi_core_fixes-v6-0-3afe499d46e3@kernel.org> To: arm-scmi@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Cristian Marussi X-Mailer: b4 0.15.2 The SCMI device request notifier looks up protocol OF nodes from the active_protocols IDR. The IDR lookup can run concurrently with protocol activation while probe is still registering protocols and creating their SCMI devices. Wrap the lookup in an RCU read-side critical section as required by the IDR API for lockless readers. Fixes: 53b8c25df708 ("firmware: arm_scmi: Add common notifier helpers") Reported-by: Sashiko Signed-off-by: Sudeep Holla --- drivers/firmware/arm_scmi/driver.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index f607557c04ad..a2871dca24dc 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include #include @@ -2958,7 +2959,9 @@ static int scmi_device_request_notifier(struct notifier_block *nb, struct scmi_device_id *id_table = data; struct scmi_info *info = req_nb_to_scmi_info(nb); + rcu_read_lock(); np = idr_find(&info->active_protocols, id_table->protocol_id); + rcu_read_unlock(); if (!np) return NOTIFY_DONE; -- 2.43.0