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=1794064172; b=AqthudUm8Fs9jSR28N7VHtGMeHe1ij650WEubsS8fweYrVYENiY8oh8OcHuaboanZHlf Opr8hEgBCq5Q8XHtwlDYKGLYSyqKp0VJjyYX//h8B+j+kkN27jYwjEEtF5yzr+FraO5L0 vNIqycSoE9N6LLVSvXBdiQ1kfzVWPLkp1bwxsKqUkuOOwsPjRvYSaI5359PYGR5eiRgAl a90i4ESSK+JOaMfYsg1UOMIiFEgJYEwXzvpkCWTHhFXOIz0rb97QeMn/m//1uztBMMAus oYMIR4wsvcDANX3rUnrroPvi5rENu+sC39POJjVUllhUK59H6fEcOPCn/ec51Ys/ysw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794064172; 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=51kCMzsgcpC24HZo15Er8bt9/jmbMEBWPxY3515WnDM=; b=thwcR9b7t2zpdYnMiGhRhKywkMLcf6swFkqxbDLCf+6OXqcXT2qhAflNSNce6TVV0cEt znmErTnQG0BfUPYfxhobckqPTHhsb19guPp+rBuscV4lBr5I+jvE+H6z4kdjlGFzYmZ7W DSOQ80e65hp4s4ahxPPU8ezkx1mQ8WFKLRW7FMbf6KC3mLLCWIjsi3T+69s5KVqcKRJ3z poIFBd6JQUNqrbIXuoVFJU2d8oxCTwyvB69NtEcN9nFldBL+rC37RFYeknELL04xqve5N aKRMvoNOm4B9TS332I7Uui+S7XTs5CVkBySO6g60gytdPr0sy+HfK/2+l2ud/M9j5sA== 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=nF4E9XUV; 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 21E5B606A32E; Sat, 7 Nov 2026 15:09:31 +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=nF4E9XUV Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7D3691F0089F; Sat, 7 Nov 2026 15:09:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1794064171; bh=51kCMzsgcpC24HZo15Er8bt9/jmbMEBWPxY3515WnDM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=nF4E9XUVtBvDjARS1hZuqQRn09g1yx3cP1HL7OGlNSnQqJOTazczFXn37YepF5nHY UjrI7G0gHXNkolAyfA6OR/RVJ/gtFwnxIcqNyee+HO7f2SdeY3RcyBBiMwQ/ZRgoYF zQMvbmD7/E+B3XXYhXJYtzV7hMt7JMiEB2i+CzkQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Tom Verdonck , Guenter Roeck , Sasha Levin Subject: [PATCH 7.3 0317/1257] hwmon: (tmp102) Fix jiffies wraparound in conversion-ready check Date: Sat, 7 Nov 2026 08:43:33 -0500 Message-ID: <20261107134948.187113315@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261107134939.434104957@linuxfoundation.org> References: <20261107134939.434104957@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 7.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tom Verdonck [ Upstream commit 56c1d32323e773b8b927316f8beeae9238576335 ] tmp102 records a one-shot deadline in ->ready_time at probe (and resume) and, on every temperature read, refuses the read with -EAGAIN while time_before(jiffies, ready_time) is true, in order to skip the first ~35 ms conversion. ->ready_time is an unsigned long compared with time_before(), whose signed difference is only meaningful while the two values are within LONG_MAX jiffies of each other. Because ->ready_time is set once and never refreshed, jiffies keeps advancing away from it, and after 2^31 jiffies the difference flips sign. On a 32-bit HZ=100 kernel that happens ~248.5 days after boot: time_before() then permanently reports "not ready" and the driver returns -EAGAIN on every read, without ever touching the sensor, until the next reboot. Store the deadline as a 64-bit jiffies value and compare it with get_jiffies_64()/time_before64(), which does not wrap in any practical uptime. Fixes: 3d8f7a89a197 ("hwmon: (tmp102) Improve handling of initial read delay") Cc: stable@vger.kernel.org Signed-off-by: Tom Verdonck Link: https://patch.msgid.link/2952f070f82913aea96eec25d28008d3b9058656.1790358356.git.tom.verdonck@inspiral.be Signed-off-by: Guenter Roeck Signed-off-by: Sasha Levin --- drivers/hwmon/tmp102.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/hwmon/tmp102.c b/drivers/hwmon/tmp102.c index 50a8b050d8da1..8c8463ddb6c45 100644 --- a/drivers/hwmon/tmp102.c +++ b/drivers/hwmon/tmp102.c @@ -58,7 +58,7 @@ struct tmp102 { const char *label; struct regmap *regmap; u16 config_orig; - unsigned long ready_time; + u64 ready_time; u16 sample_time; }; @@ -106,7 +106,7 @@ static int tmp102_read_temp(struct device *dev, u32 attr, long *val) switch (attr) { case hwmon_temp_input: /* Is it too early to return a conversion ? */ - if (time_before(jiffies, tmp102->ready_time)) { + if (time_before64(get_jiffies_64(), tmp102->ready_time)) { dev_dbg(dev, "%s: Conversion not ready yet..\n", __func__); return -EAGAIN; } @@ -354,7 +354,7 @@ static int tmp102_probe(struct i2c_client *client) * Mark that we are not ready with data until the first * conversion is complete */ - tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); + tmp102->ready_time = get_jiffies_64() + msecs_to_jiffies(CONVERSION_TIME_MS); hwmon_dev = devm_hwmon_device_register_with_info(dev, client->name, tmp102, @@ -387,7 +387,7 @@ static int tmp102_resume(struct device *dev) err = regmap_update_bits(tmp102->regmap, TMP102_CONF_REG, TMP102_CONF_SD, 0); - tmp102->ready_time = jiffies + msecs_to_jiffies(CONVERSION_TIME_MS); + tmp102->ready_time = get_jiffies_64() + msecs_to_jiffies(CONVERSION_TIME_MS); return err; } -- 2.53.0