From patchwork Fri Aug 18 19:34:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bart Van Assche X-Patchwork-Id: 715331 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 46435EE4999 for ; Fri, 18 Aug 2023 19:48:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1379835AbjHRTrp (ORCPT ); Fri, 18 Aug 2023 15:47:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48474 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1379862AbjHRTr1 (ORCPT ); Fri, 18 Aug 2023 15:47:27 -0400 Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C515D46A0; Fri, 18 Aug 2023 12:46:47 -0700 (PDT) Received: by mail-pl1-x62e.google.com with SMTP id d9443c01a7336-1bf3a2f44f0so7514845ad.2; Fri, 18 Aug 2023 12:46:47 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1692387885; x=1692992685; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=Uz9IhUw0fhLa+d31AmvvxEIaG6umYa3gXf+jIQrc2ys=; b=PhRffwHiAyj6u6YTl0ReefmOAkIBluNmMZwCgHnLHOuykbGBxja3DYnUXDr0xRhEJH Cq+Fof+W3RHa5nrjM8POjIPB3MKgR9CSOCIKVsNvLtq33Z7xYP2m8pB0PWH3JvYQUhtM JcSp+yHs6PGPFwDRl2pZzvr6iTtXEJ/JpgHXn4FjuwUBy+jB5aHRyRlpWNt5SEvWc9qc oxcbDByyNohfV4v0NDqBl9z4uTtQOhgCMbZ1pzxtJQHRPVpkR0t4XRMgij5sEPHTNKTr f/ePVWBy+R2DsOnt6QiUS+G96udMSbZMtOjF8Yhzu7J7oP8EQ7tdr03KHwPCq1HOBfDl QFXw== X-Gm-Message-State: AOJu0Yzo49EX5HEpMqL6Z7KXGD1sFvFQ5HD6awXv5GwW628XUCaI510p o7yaCw9QPaivHmtZL/AxXGs= X-Google-Smtp-Source: AGHT+IHlu8hqOTbdqsplVPmXn7e7E+Hc5Whx5dtj8RVMixWwtLZu6cu1FccsMZoLOVVJr8Khijpabw== X-Received: by 2002:a17:902:ee89:b0:1bd:e877:a7bc with SMTP id a9-20020a170902ee8900b001bde877a7bcmr226318pld.7.1692387884731; Fri, 18 Aug 2023 12:44:44 -0700 (PDT) Received: from bvanassche-linux.mtv.corp.google.com ([2620:15c:211:201:5012:5192:47aa:c304]) by smtp.gmail.com with ESMTPSA id u16-20020a170903125000b001bb8be10a84sm2115801plh.304.2023.08.18.12.44.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Aug 2023 12:44:44 -0700 (PDT) From: Bart Van Assche To: Jens Axboe Cc: linux-block@vger.kernel.org, linux-scsi@vger.kernel.org, "Martin K . Petersen" , Christoph Hellwig , Bart Van Assche , Can Guo , Avri Altman , "Bao D . Nguyen" , "James E.J. Bottomley" , Stanley Chu , Bean Huo , Asutosh Das , Arthur Simchaev Subject: [PATCH v10 16/18] scsi: ufs: Simplify ufshcd_auto_hibern8_update() Date: Fri, 18 Aug 2023 12:34:19 -0700 Message-ID: <20230818193546.2014874-17-bvanassche@acm.org> X-Mailer: git-send-email 2.42.0.rc1.204.g551eb34607-goog In-Reply-To: <20230818193546.2014874-1-bvanassche@acm.org> References: <20230818193546.2014874-1-bvanassche@acm.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org Calls to ufshcd_auto_hibern8_update() are already serialized: this function is either called if user space software is not running (preparing to suspend) or from a single sysfs store callback function. Kernfs serializes sysfs .store() callbacks. No functionality is changed. This patch makes the next patch in this series easier to read. Cc: Martin K. Petersen Cc: Can Guo Cc: Avri Altman Cc: Bao D. Nguyen Signed-off-by: Bart Van Assche Reviewed-by: Can Guo --- drivers/ufs/core/ufshcd.c | 16 ++++------------ 1 file changed, 4 insertions(+), 12 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index a08924972b20..68bf8e94eee6 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -4347,21 +4347,13 @@ static void ufshcd_configure_auto_hibern8(struct ufs_hba *hba) int ufshcd_auto_hibern8_update(struct ufs_hba *hba, u32 ahit) { - unsigned long flags; - bool update = false; + const u32 cur_ahit = READ_ONCE(hba->ahit); - if (!ufshcd_is_auto_hibern8_supported(hba)) + if (!ufshcd_is_auto_hibern8_supported(hba) || cur_ahit == ahit) return 0; - spin_lock_irqsave(hba->host->host_lock, flags); - if (hba->ahit != ahit) { - hba->ahit = ahit; - update = true; - } - spin_unlock_irqrestore(hba->host->host_lock, flags); - - if (update && - !pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) { + WRITE_ONCE(hba->ahit, ahit); + if (!pm_runtime_suspended(&hba->ufs_device_wlun->sdev_gendev)) { ufshcd_rpm_get_sync(hba); ufshcd_hold(hba); ufshcd_configure_auto_hibern8(hba);