From patchwork Sat May 25 01:19:13 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 13673867 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.8]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CE948391; Sat, 25 May 2024 01:19:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=192.198.163.8 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716599956; cv=none; b=Z6xe0SvrMHdEPY326csrgkAwjG80697AxMlB3eduTgVpACYItdldEB30/wntZW0fucRiJkkP1jhgoTP8k21bHOJ5vxBgNhGpF22L8qJlB+2sQ0UK2oaWJCCdY0Hr1iaf/d4sRtKXf/66iCBBuXoP06Htm1XuNBnQ7vvXJVNrzQ4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716599956; c=relaxed/simple; bh=ap4v45uI0enMHG9NFW2Bq1hG0XIksaXQL2xwlU8v4nc=; h=Subject:From:To:Cc:Date:Message-ID:MIME-Version:Content-Type; b=YW5m+NWkx9XQ6DxeMIqA/J1u8hgaC+Gd8iN7GPyls9u5OcTOkSTgQ3na/uL4ZBJRlGgPBOWbgnlxMsPOOH+30PvcypXZ7CG7zQ02ZXzjPcGuCBKI0/Ot90Z4arBxZZWKqMnLRl2+StzIXCB4EbmR9pi/QHL8nW00LfJa6E06ums= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=fF19ZvpB; arc=none smtp.client-ip=192.198.163.8 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="fF19ZvpB" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1716599955; x=1748135955; h=subject:from:to:cc:date:message-id:mime-version: content-transfer-encoding; bh=ap4v45uI0enMHG9NFW2Bq1hG0XIksaXQL2xwlU8v4nc=; b=fF19ZvpBZRtc6n6CEjot268TBaatq0lFuLGXyAVYJ2oWyMITsqfczzKU uiPBoGh+4e5DS28Y7g+iuPWy6o/FsDphQFdGcd0kDolPHf7VGYAdpKB6W et04exQJiTGNj+5OEB+EcQ8Las/q2hGQVfBgf7l8stNGy3GnM91uGkZOZ /pNZ3bt/5l5dEV1fwqJYLQKVRS86E9O/CTmQSLdPBEw3c9bAJTAoi7qkf kXw/onDJ2buWEEWBT2y62sGRUx/V9+t8Q6/xvjgrIX9nkynppjrAaY56+ HtwkKQUuSx4BOf36xkTogHiA9p0ReGHV7vHXeJXnkkhRIKkZqc9oa8hjz Q==; X-CSE-ConnectionGUID: +jforYnUSJutpo2doqhtlg== X-CSE-MsgGUID: NtVEMAffSIykiNrcMU04Gw== X-IronPort-AV: E=McAfee;i="6600,9927,11082"; a="30526421" X-IronPort-AV: E=Sophos;i="6.08,187,1712646000"; d="scan'208";a="30526421" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by fmvoesa102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 May 2024 18:19:14 -0700 X-CSE-ConnectionGUID: 061OwXMaQtSL/aW5i9gdyQ== X-CSE-MsgGUID: DPJl48BSSP2O8N7+pA7c2w== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.08,187,1712646000"; d="scan'208";a="34690044" Received: from mdhassa1-mobl.amr.corp.intel.com (HELO dwillia2-xfh.jf.intel.com) ([10.212.164.6]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 May 2024 18:19:14 -0700 Subject: [PATCH] PCI: Fix missing lockdep annotation for pci_cfg_access_trylock() From: Dan Williams To: bhelgaas@google.com Cc: Alex Williamson , Alex Williamson , Dave Jiang , linux-pci@vger.kernel.org, linux-cxl@vger.kernel.org Date: Fri, 24 May 2024 18:19:13 -0700 Message-ID: <171659995361.845588.6664390911348526329.stgit@dwillia2-xfh.jf.intel.com> User-Agent: StGit/0.18-3-g996c Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Alex reports a new vfio-pci lockdep warning resulting from the cfg_access_lock lock_map added recently. Add the missing annotation to pci_cfg_access_trylock() and adjust the lock_map acquisition to be symmetrical relative to pci_lock. Fixes: 7e89efc6e9e4 ("PCI: Lock upstream bridge for pci_reset_function()") Reported-by: Alex Williamson Closes: http://lore.kernel.org/r/20240523131005.5578e3de.alex.williamson@redhat.com Tested-by: Alex Williamson Cc: Dave Jiang Cc: Bjorn Helgaas Signed-off-by: Dan Williams Reviewed-by: Dave Jiang --- drivers/pci/access.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/pci/access.c b/drivers/pci/access.c index 30f031de9cfe..3595130ff719 100644 --- a/drivers/pci/access.c +++ b/drivers/pci/access.c @@ -289,11 +289,10 @@ void pci_cfg_access_lock(struct pci_dev *dev) { might_sleep(); - lock_map_acquire(&dev->cfg_access_lock); - raw_spin_lock_irq(&pci_lock); if (dev->block_cfg_access) pci_wait_cfg(dev); + lock_map_acquire(&dev->cfg_access_lock); dev->block_cfg_access = 1; raw_spin_unlock_irq(&pci_lock); } @@ -315,8 +314,10 @@ bool pci_cfg_access_trylock(struct pci_dev *dev) raw_spin_lock_irqsave(&pci_lock, flags); if (dev->block_cfg_access) locked = false; - else + else { + lock_map_acquire(&dev->cfg_access_lock); dev->block_cfg_access = 1; + } raw_spin_unlock_irqrestore(&pci_lock, flags); return locked; @@ -342,11 +343,10 @@ void pci_cfg_access_unlock(struct pci_dev *dev) WARN_ON(!dev->block_cfg_access); dev->block_cfg_access = 0; + lock_map_release(&dev->cfg_access_lock); raw_spin_unlock_irqrestore(&pci_lock, flags); wake_up_all(&pci_cfg_wait); - - lock_map_release(&dev->cfg_access_lock); } EXPORT_SYMBOL_GPL(pci_cfg_access_unlock);