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 ECD7143E08B; Tue, 21 Jul 2026 22:13:56 +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=1784672038; cv=none; b=poINEVnHSHQ8ntb7Fie0dnoUHsMDCMD1k5EpXSZTraNnf0zQn6xpcaf3oKfrwImaFJKUMUQX/Rg+VsUPoZNa2I9tRj7ZzcBMugNhpIGO0wAX8PMWcJdOYmeZ+rZ+YZfoNksQVfsMrksO8pPFMQSnGDcB+678d66umhkwJE0euek= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672038; c=relaxed/simple; bh=GDzajw8UJKD6uMHkF+yJpR4oRztVn1sN+2BTTM/fSFI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=eQt7ZxXpbC6dpUM0s/Yru3B9ac9jPFpWlJ9abtuwUfabSF/Ul4YRMobKjGq+Nzkq04G0Cb/CtlzuWfC3PHu15nckbut3UasnBtG84NAdYh2K+2oZnv3ubsdRt5hpDyDbN794Ex+un3P6BpAuma905nNnGyXMUL9eKUIavkAEkeg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sEDQnzNm; 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="sEDQnzNm" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5667F1F00A3A; Tue, 21 Jul 2026 22:13:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672036; bh=ckb/r9Ct9ZF4YN0vtzTXBwne30JYOTEOV11pkYKNE04=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=sEDQnzNmNm4YfO348n/3+k+VPC+trxCPSGIcVckBHO/x67gkg68iXy9P7HjA3rhhP GSFcUilqh4ZbOg+wSJC8mbHkoCkUybG/tlxabhTU1w1DwNqT7Um4+o1Dy9kgtr5uJy iVFOY1zXlTV8aEPxCQC7wVDTrY3L2IMaWODHqwps= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Aleksandrova Alyona , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.15 473/843] net: dsa: sja1105: round up PTP perout pin duration Date: Tue, 21 Jul 2026 17:21:48 +0200 Message-ID: <20260721152416.677621127@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@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: Aleksandrova Alyona [ Upstream commit aee5836273b07b439fb245fb43930664d8b78518 ] pin_duration is converted from the user-provided period to SJA1105 clock ticks and is later passed as the cycle_time argument to future_base_time(). Very small period values may become zero after the conversion, which can lead to a division by zero in future_base_time(). Round zero pin_duration up to 1 tick so that the smallest unsupported periods use the minimum non-zero hardware duration instead of passing zero to future_base_time(). Fixes: 747e5eb31d59 ("net: dsa: sja1105: configure the PTP_CLK pin as EXT_TS or PER_OUT") Signed-off-by: Aleksandrova Alyona Link: https://patch.msgid.link/20260618110508.53094-1-aga@itb.spb.ru Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- drivers/net/dsa/sja1105/sja1105_ptp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/dsa/sja1105/sja1105_ptp.c b/drivers/net/dsa/sja1105/sja1105_ptp.c index 54396992a9199c..c14d599d8682b5 100644 --- a/drivers/net/dsa/sja1105/sja1105_ptp.c +++ b/drivers/net/dsa/sja1105/sja1105_ptp.c @@ -766,7 +766,7 @@ static int sja1105_per_out_enable(struct sja1105_private *priv, * 2 edges on PTP_CLK. So check for truncation which happens * at periods larger than around 68.7 seconds. */ - pin_duration = ns_to_sja1105_ticks(pin_duration / 2); + pin_duration = max_t(u64, ns_to_sja1105_ticks(pin_duration / 2), 1); if (pin_duration > U32_MAX) { rc = -ERANGE; goto out; -- 2.53.0