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[2620:137:e000::1:20]) by mx.google.com with ESMTP id nc19si12111457ejc.670.2022.02.10.01.13.57; Thu, 10 Feb 2022 01:14:22 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238245AbiBJJHX (ORCPT + 99 others); Thu, 10 Feb 2022 04:07:23 -0500 Received: from mxb-00190b01.gslb.pphosted.com ([23.128.96.19]:40042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238209AbiBJJHV (ORCPT ); Thu, 10 Feb 2022 04:07:21 -0500 Received: from relay3.hostedemail.com (relay3.hostedemail.com [64.99.140.34]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0E997103B for ; Thu, 10 Feb 2022 01:07:22 -0800 (PST) Received: from omf04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 500C621737; Thu, 10 Feb 2022 09:07:21 +0000 (UTC) Received: from [HIDDEN] (Authenticated sender: joe@perches.com) by omf04.hostedemail.com (Postfix) with ESMTPA id 5283220024; Thu, 10 Feb 2022 09:07:20 +0000 (UTC) Message-ID: Subject: Re: [PATCH] media: si21xx: use time_after_eq() instead of jiffies judgment From: Joe Perches To: Qing Wang , Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 10 Feb 2022 01:07:19 -0800 In-Reply-To: <1644481917-14908-1-git-send-email-wangqing@vivo.com> References: <1644481917-14908-1-git-send-email-wangqing@vivo.com> Content-Type: text/plain; charset="ISO-8859-1" User-Agent: Evolution 3.40.4-1ubuntu2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspamout07 X-Rspamd-Queue-Id: 5283220024 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,RCVD_IN_DNSWL_NONE, SPF_HELO_PASS,SPF_NONE,T_SCC_BODY_TEXT_LINE,UNPARSEABLE_RELAY autolearn=ham autolearn_force=no version=3.4.6 X-Stat-Signature: k5czy5bajfy3ohaj8xg4h143sxiw5dfz X-Session-Marker: 6A6F6540706572636865732E636F6D X-Session-ID: U2FsdGVkX1+L0e1w6UKfCZc20sVn7oLYC2iZ5VFaWrI= X-HE-Tag: 1644484040-566136 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 2022-02-10 at 00:31 -0800, Qing Wang wrote: > From: Wang Qing > > It is better to use time_xxx() directly instead of jiffies judgment > for understanding. [] > diff --git a/drivers/media/dvb-frontends/si21xx.c b/drivers/media/dvb-frontends/si21xx.c [] > @@ -336,7 +336,7 @@ static int si21xx_wait_diseqc_idle(struct si21xx_state *state, int timeout) > dprintk("%s\n", __func__); > > while ((si21_readreg(state, LNB_CTRL_REG_1) & 0x8) == 8) { > - if (jiffies - start > timeout) { > + if (time_after(jiffies, start + timeout)) { > dprintk("%s: timeout!!\n", __func__); > return -ETIMEDOUT; > } Appreciate all the conversions (IMO it should have been sent as a block of patches with a cover letter instead of independent unrelated patches) but wouldn't all of these be simpler and more consistent using a style where the addition is done once and the timeout test is something like: unsigned long end = jiffies + timeout; while (foo) { if (time_after(jiffies, end)) { error_msg(...) return -ETIMEDOUT; } bar...; }