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GET /api/patches/806756/?format=api
{ "id": 806756, "url": "http://patchwork.ozlabs.org/api/patches/806756/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/patch/20170828200033.40673-1-dbasehore@chromium.org/", "project": { "id": 38, "url": "http://patchwork.ozlabs.org/api/projects/38/?format=api", "name": "Linux PWM development", "link_name": "linux-pwm", "list_id": "linux-pwm.vger.kernel.org", "list_email": "linux-pwm@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20170828200033.40673-1-dbasehore@chromium.org>", "list_archive_url": null, "date": "2017-08-28T20:00:33", "name": "pwm_bl: Fix overflow condition", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "e89c504d64ac541b8b43cff09c0cc5c2af57e342", "submitter": { "id": 20364, "url": "http://patchwork.ozlabs.org/api/people/20364/?format=api", "name": "dbasehore .", "email": "dbasehore@chromium.org" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pwm/patch/20170828200033.40673-1-dbasehore@chromium.org/mbox/", "series": [ { "id": 250, "url": "http://patchwork.ozlabs.org/api/series/250/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/list/?series=250", "date": "2017-08-28T20:00:33", "name": "pwm_bl: Fix overflow condition", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/250/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/806756/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/806756/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<linux-pwm-owner@vger.kernel.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@bilbo.ozlabs.org", "Authentication-Results": [ "ozlabs.org;\n\tspf=none (mailfrom) smtp.mailfrom=vger.kernel.org\n\t(client-ip=209.132.180.67; helo=vger.kernel.org;\n\tenvelope-from=linux-pwm-owner@vger.kernel.org;\n\treceiver=<UNKNOWN>)", "ozlabs.org;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n\tunprotected) header.d=chromium.org header.i=@chromium.org\n\theader.b=\"lyaIBld1\"; dkim-atps=neutral" ], "Received": [ "from vger.kernel.org (vger.kernel.org [209.132.180.67])\n\tby ozlabs.org (Postfix) with ESMTP id 3xh2gr5WjMz9s7c\n\tfor <incoming@patchwork.ozlabs.org>;\n\tTue, 29 Aug 2017 06:00:40 +1000 (AEST)", "(majordomo@vger.kernel.org) by vger.kernel.org via listexpand\n\tid S1751192AbdH1UAj (ORCPT <rfc822;incoming@patchwork.ozlabs.org>);\n\tMon, 28 Aug 2017 16:00:39 -0400", "from mail-pg0-f44.google.com ([74.125.83.44]:34617 \"EHLO\n\tmail-pg0-f44.google.com\" rhost-flags-OK-OK-OK-OK) by vger.kernel.org\n\twith ESMTP id S1750735AbdH1UAj (ORCPT\n\t<rfc822; linux-pwm@vger.kernel.org>); Mon, 28 Aug 2017 16:00:39 -0400", "by mail-pg0-f44.google.com with SMTP id y15so4396616pgc.1\n\tfor <linux-pwm@vger.kernel.org>; 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\n\tMon, 28 Aug 2017 13:00:38 -0700 (PDT)", "From": "Derek Basehore <dbasehore@chromium.org>", "To": "linux-kernel@vger.kernel.org", "Cc": "thierry.reding@gmail.com, jingoohan1@gmail.com,\n\tlee.jones@linaro.org, linux-pwm@vger.kernel.org,\n\tDerek Basehore <dbasehore@chromium.org>", "Subject": "[PATCH] pwm_bl: Fix overflow condition", "Date": "Mon, 28 Aug 2017 13:00:33 -0700", "Message-Id": "<20170828200033.40673-1-dbasehore@chromium.org>", "X-Mailer": "git-send-email 2.14.1.342.g6490525c54-goog", "Sender": "linux-pwm-owner@vger.kernel.org", "Precedence": "bulk", "List-ID": "<linux-pwm.vger.kernel.org>", "X-Mailing-List": "linux-pwm@vger.kernel.org" }, "content": "This fixes and overflow condition that happens with a high value of\nbrightness-levels-scale by using a 64-bit variable. The issue would\nprevent a range of higher brightness levels from being set.\n\nSigned-off-by: Derek Basehore <dbasehore@chromium.org>\n---\n drivers/video/backlight/pwm_bl.c | 7 +++++--\n 1 file changed, 5 insertions(+), 2 deletions(-)", "diff": "diff --git a/drivers/video/backlight/pwm_bl.c b/drivers/video/backlight/pwm_bl.c\nindex 76311ec5e400..e7ffd2108acf 100644\n--- a/drivers/video/backlight/pwm_bl.c\n+++ b/drivers/video/backlight/pwm_bl.c\n@@ -88,14 +88,17 @@ static void pwm_backlight_power_off(struct pwm_bl_data *pb)\n static int compute_duty_cycle(struct pwm_bl_data *pb, int brightness)\n {\n \tunsigned int lth = pb->lth_brightness;\n-\tint duty_cycle;\n+\ts64 duty_cycle;\n \n \tif (pb->levels)\n \t\tduty_cycle = pb->levels[brightness];\n \telse\n \t\tduty_cycle = brightness;\n \n-\treturn (duty_cycle * (pb->period - lth) / pb->scale) + lth;\n+\tduty_cycle *= pb->period - lth;\n+\tdo_div(duty_cycle, pb->scale);\n+\n+\treturn duty_cycle + lth;\n }\n \n static int pwm_backlight_update_status(struct backlight_device *bl)\n", "prefixes": [] }