From nobody Mon Feb 9 19:10:48 2026 Received: from mail-pf1-f169.google.com (mail-pf1-f169.google.com [209.85.210.169]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 64D1926A1A4 for ; Thu, 29 Jan 2026 07:15:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.169 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769670958; cv=none; b=RyTXVLEh+k6Hyd92ESduiEGtIxLuv/+AV+N5/+aORrj6GX3mdx7ZY9S4dOYay4UqrOYgYjWiqvsrw6oyMVh7r6J7tzVJMaqBm0oBwjNkZAuvB5ptrX0cf2wsV15MI5k/610VIbITG/Rve3D2sVTdhAig1l9VEQBhafbDDE/dVnA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769670958; c=relaxed/simple; bh=hdbt0KpHpLnZ+wea257k0KkCNlvLUHzZoMEnZliGbVg=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=aoaG3AuKgKhlLGbz4B+Lk1E88TSsJf7OBVUX8MUXoOdjzESA56Vm2fr7/vRXzCvs+rGJf/87Rmzo2/VR+iaLbGsZxIxDWfwmH9j0oXoC1lH0pG1aYXVmeoNjO3PuKpdMGRhWR5ERgJ0HcAlbwkY+uFmbD0yJY+IRQas4yBjPTN0= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.210.169 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-pf1-f169.google.com with SMTP id d2e1a72fcca58-82318b640beso375090b3a.0 for ; Wed, 28 Jan 2026 23:15:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1769670957; x=1770275757; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=FJYYjMdlOHZYjFAFO/sm/ocfavFCyx7F3uAXbE797SU=; b=YHRXdLULRhZff/DKJ6NpMATeC6z4mXTD0ZsxmlGjYhpvfviLZWl6F2xidd66T19CSc leBmZdPO41OmfeAh9q1MogIhY+5yFPhYqdP4j/2ADHryICB7A9Dx6F+rv2IAvhgmucEp Jjp+MCQjCjLgcsGe+aA38vZ5Y16HpR/39deXN7ZnYN+xlV1sWXNfRRi/nZomSao1ONuN cwSn7qbZCR9jte8Cb1A/i5X+Euyez1XYsBNyUpQujUs5k6mT08uW3vjgB4Espqmm3dAe uQgObV+W+O47SW7e89emIg8fxqNA8O2vTIpL4PF+b9Sy215UyMFin+Nfy2M4J33RLUHL 2sbg== X-Forwarded-Encrypted: i=1; AJvYcCVrvU0aAY9cRJqkIYndIkUYU0rKjgKmipFDFcjV9s1tCIgoceMDVaQxuTSYU+POcXm8M3B8yWfmhvfYJ1E=@vger.kernel.org X-Gm-Message-State: AOJu0YwiKTu7xMcH1Aw1Eb34TZSqIo3m/np/yLWPaKv4wXRjkygz+T5r cmT8EHu7OB8dzJObTWaz2105bzO/qpnAV5lb6hBRODWbDJggXiGxlZn2DMuUvDr2 X-Gm-Gg: AZuq6aLgRmOEdfXiZ/eRD3LW6J2E/TznVdYJqosTZCWmavrvUirF/xIQfOmtfRrIrXb aCebqP4vJQ1JZrYHGWb0MK8Sml4DpPiEtaCKLQ1TcZeb3tT6RTEM1wLO/ORWrCPhaHoo1cNp0NI tYVrs3kLYYu+GrZLG32FrvWtWc+HZOv2v2erSZ3NqKdUBrpgKzdZX99L+tTCB/7BoFfwzx38Wta U0fXTf0bQg1FMszwQmKcOYAj7jxdrUKL5o25Pa2c5z5PfnuomOd9Ej+wrM1WR1en1kQEmtsbiEL OLvNhDLrShFEvY6Geat1IueH86CCQl8kkXaSYeWXA1potMsLVgDDqowukQr1ZNSpUxdxiU1eZXq 6/8odH65F1jyOKGNhE1OjZCXnkNSc2e5yHDLImOvJgMhuKg9rKxa7y55MNdEjAFlYig0rrsw/7i VAf++t2W+13jp7CfbsYI3nROLoIqQ= X-Received: by 2002:a05:6a00:23c2:b0:7b9:4e34:621b with SMTP id d2e1a72fcca58-8236913d770mr7251181b3a.12.1769670956703; Wed, 28 Jan 2026 23:15:56 -0800 (PST) Received: from localhost.localdomain ([116.128.244.169]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379bfd8d3sm4527128b3a.38.2026.01.28.23.15.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 28 Jan 2026 23:15:56 -0800 (PST) From: Hongyu Xie To: bhelgaas@google.com Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Hongyu Xie Subject: [PATCH v1] PCI: replace msleep to save waiting time Date: Thu, 29 Jan 2026 15:15:49 +0800 Message-Id: <20260129071549.425033-1-xiehongyu1@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" In pcie_wait_for_link_status, using msleep(1) to wait for link status change. But msleep(1) can sleep for nearly 5ms. ftrace shows: 0) | pcie_wait_for_link_status() { 0) 0.500 us | pcie_capability_read_word(); 0) 0.580 us | pcie_capability_read_word(); 0) * 10292.26 us | } after changing to usleep_range. ftrace shows: 0) | pcie_wait_for_link_status() { 0) 0.320 us | pcie_capability_read_word(); 0) 0.480 us | pcie_capability_read_word(); 0) # 2483.980 us | } So fix this by using usleep_range. Signed-off-by: Hongyu Xie --- drivers/pci/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 13dbb405dc31..151364cb767d 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -4484,7 +4484,7 @@ static int pcie_wait_for_link_status(struct pci_dev *= pdev, pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnksta); if ((lnksta & lnksta_mask) =3D=3D lnksta_match) return 0; - msleep(1); + usleep_range(1000, 1100); } while (time_before(jiffies, end_jiffies)); =20 return -ETIMEDOUT; --=20 2.25.1