From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx4/Xr15Vc7XitW4hTJMwSEhp28xa3JZDaNjHsLimU02UstL6iSvnJeLqRZ9tl+YyCQvpqiIB ARC-Seal: i=1; a=rsa-sha256; t=1524406681; cv=none; d=google.com; s=arc-20160816; b=XEQpVAueUJbbJv4Psgg8egSNtVTt1DzkPaXzXWPE8aSBhyKsmYsVlatS7zq0t2PNe8 pmbd31XmbZ61NObPfyalO/k98KWNQgDi2knKGdD2/FuOAGtgZSH7Cf9hcuLARlYy8v5U 3upIu+skr03QsuUCCim0v8gFwSFaWEIb17VZarQ3RZC/33tvCJ1KVC/L7VfJo3UNWVuZ UoqFNvovaqVCh2deOP/5Jt7wfO3l15LkgHMFF8d98hDjEEItOMz9Ai7bVdl2wL1NTrAH YmzY+CbL3749Y1NBk4ZfszNqIVwWiyXrjnO2oKhwvCiMAig8/4JiOLOfr1qUJxpWuoFV nXdw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=XG26shWtzGNpXzVgzRvbQYIdAmxNPUeJ0AYiXJCEC1c=; b=ov7yi8sDncArJWhGkzZ4oCBYP3ERgP5px1xhVUyY6RRZXiSFZ+9de5mYmV/vq8U6GD d/xZzDqbqC+m9eEQMs/FDb2NnFrgGC3YKaLOg7bFQCtbTFt32WDPdvqDw2DCjDNv7qib rAH+o7V32o7MlQv9/NYH4MnvUm8EzYhGh1A0drxrcLwy0btjyFg+OoTLqWkJe4IntfHK 2dP9FsmaThK77vYoajXWCMMih6xuaOUySRZQS2Tvm0FlUahJO7GdDCUyT8Lot8he276N BRlTkamM0QogSDCz56uC1kLpvs4bhovEbmh9R0nHvB+xFK5BDwlTVF+8tqM/3Ip1AD8u QnoA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 90.92.61.202 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikhail Lappo , Fabio Estevam , Philipp Zabel , Dong Aisheng , Zhang Rui Subject: [PATCH 4.4 63/97] thermal: imx: Fix race condition in imx_thermal_probe() Date: Sun, 22 Apr 2018 15:53:41 +0200 Message-Id: <20180422135308.741318759@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180422135304.577223025@linuxfoundation.org> References: <20180422135304.577223025@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598455189066394572?= X-GMAIL-MSGID: =?utf-8?q?1598456260331060610?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikhail Lappo commit cf1ba1d73a33944d8c1a75370a35434bf146b8a7 upstream. When device boots with T > T_trip_1 and requests interrupt, the race condition takes place. The interrupt comes before THERMAL_DEVICE_ENABLED is set. This leads to an attempt to reading sensor value from irq and disabling the sensor, based on the data->mode field, which expected to be THERMAL_DEVICE_ENABLED, but still stays as THERMAL_DEVICE_DISABLED. Afher this issue sensor is never re-enabled, as the driver state is wrong. Fix this problem by setting the 'data' members prior to requesting the interrupts. Fixes: 37713a1e8e4c ("thermal: imx: implement thermal alarm interrupt handling") Cc: Signed-off-by: Mikhail Lappo Signed-off-by: Fabio Estevam Reviewed-by: Philipp Zabel Acked-by: Dong Aisheng Signed-off-by: Zhang Rui Signed-off-by: Greg Kroah-Hartman --- drivers/thermal/imx_thermal.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) --- a/drivers/thermal/imx_thermal.c +++ b/drivers/thermal/imx_thermal.c @@ -589,6 +589,9 @@ static int imx_thermal_probe(struct plat regmap_write(map, TEMPSENSE0 + REG_CLR, TEMPSENSE0_POWER_DOWN); regmap_write(map, TEMPSENSE0 + REG_SET, TEMPSENSE0_MEASURE_TEMP); + data->irq_enabled = true; + data->mode = THERMAL_DEVICE_ENABLED; + ret = devm_request_threaded_irq(&pdev->dev, data->irq, imx_thermal_alarm_irq, imx_thermal_alarm_irq_thread, 0, "imx_thermal", data); @@ -600,9 +603,6 @@ static int imx_thermal_probe(struct plat return ret; } - data->irq_enabled = true; - data->mode = THERMAL_DEVICE_ENABLED; - return 0; }