From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794062979; b=ApBr/csUpW9vJ12fCpda6IQWjAoH/vpvz0klAbOPKch2d1VVp6VRNNvBAPLN6cQ4YNF6 RKk0VXkW/nDSm5C/qo22dy6v6Mg2WiJY26m31M8bqIqfOLunOX+g2CM3FF9iWZcL/CVQ/ 3b+estkK+Gof0MAAqg/w8mj6J3JirRa2cfTE/Mk7wzbd9WvqKJ7ThoJa4nuzvg7WjZRFQ Typ5DGo8yC7cE6UPEefR5+1vQUJOt55yS107dZvRPwCNdGdrVirHPDodEAF05fIGncuwh 5g6hRgDzlU3Em6ne1K6a178wqtLBlE0OiUKNTroEGbVOzOq8yDZyOiMmOtkmIIxB9AQ== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794062979; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=/dewe3QzfImDF5CBq3NGcm2kiSDeAnmiRlrDXwymA5Q=; b=Zj7/H2xYpc9sh94mC9IhlZxdpewtSZrB3Zoo87zwhdkpUesTkUPo1zNN+ARI3TOB35tW ZhCq9Zrqyx6/SY9oDCRo5M+Uyla95Zmw70OCiYnh0bPfSuDbAvPW+a+iQHtcKMC3lAp64 WsQuIekxfW0ILpQLw4jraDdwzcgtXENRyHpmDJral06Chj4ScJkt2LDLRueAeO6cw8mcv TbW2DCdbFe6FffJNyH6eYdv+r2zL8siPwLqwLyyMtRcTdcHKvwPFQ0rmOenipq2KLFrUS 5eES2xipt/gCYerW2EQXYgNs7XV+cf2IPuoFoKRbjS/RshPFozmuYgsAmkCu/9LdzYw== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=rqX1LZGW; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7845F606A32C; Sat, 7 Nov 2026 14:49:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=rqX1LZGW Received: by smtp.kernel.org (Postfix) with ESMTPSA id 264831F0089F; Sat, 7 Nov 2026 14:49:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794062979; bh=/dewe3QzfImDF5CBq3NGcm2kiSDeAnmiRlrDXwymA5Q=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=rqX1LZGW9wp/JNgMSkJqrxTBGS/MTSum1JwDt4XdWsFw4/5ahUr3R2fU/aCMnLKop CQpXaDVpIYSikk5c8cizZy6QaTAHEs3Zea3hixVf7Qr4Loo/XdJLgfQzrl+lQ/eApu 40KtKpzYly8d55S2sVOaeogxGC1wkwJKINTe9TOM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ridham Khurana , Guenter Roeck , Sasha Levin Subject: [PATCH 6.18 240/869] hwmon: (lm95245) Fix negative temperature conversion Date: Sat, 7 Nov 2026 08:48:42 -0500 Message-ID: <20261107134859.963382529@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134852.069646174@linuxfoundation.org> References: <20261107134852.069646174@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: stable@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ridham Khurana [ Upstream commit f58c16056f8585ebafb0f1f5d90c23085443a4b9 ] temp_from_reg_signed() uses only the high byte when the sign bit is set and drops the fractional bits in the low byte. Writing -500 to temp2_offset stores 0xff80 (-0.5 degrees C) in the offset registers, but reading temp2_offset back returns -1000. Negative temp1_input and temp2_input values are rounded down to the next whole degree the same way. The chip reports -0.125 degrees C as 0xffe0, which the driver returns as -1000. Treat the register pair as a single 16-bit two's complement value. Fixes: fffd80ccc1e6 ("hwmon: LM95245 driver") Cc: stable@vger.kernel.org Signed-off-by: Ridham Khurana Link: https://patch.msgid.link/20260923172551.1593798-1-khurana.ridham222@gmail.com Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/lm95245.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/hwmon/lm95245.c b/drivers/hwmon/lm95245.c index 3bdc305308479..9c977d2820f9c 100644 --- a/drivers/hwmon/lm95245.c +++ b/drivers/hwmon/lm95245.c @@ -98,9 +98,9 @@ static int temp_from_reg_unsigned(u8 val_h, u8 val_l) static int temp_from_reg_signed(u8 val_h, u8 val_l) { - if (val_h & 0x80) - return (val_h - 0x100) * 1000; - return temp_from_reg_unsigned(val_h, val_l); + s16 val_hl = (val_h << 8) | val_l; + + return val_hl * 1000 / 256; } static int lm95245_read_conversion_rate(struct lm95245_data *data) -- 2.53.0