From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-57.mta0.migadu.com (out-57.mta0.migadu.com [91.218.175.57]) (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 7213E15A7 for ; Fri, 24 Mar 2023 01:32:39 +0000 (UTC) X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1679621557; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=RrieUzsMuRHYXa8v1AQdzJWDE6SJhykPzWCWACiwQL8=; b=gSX0c39MYWvxeObx2gcyVm4rNyqxjY2FDJcQzPbUsmjLAH0+FwWuhfYLCESL1v6J99OA1G wdtLiwdQeyOHlvmfX75a9RkPwzrBm2vnvPBTHtEzDxiL/QfqwZ0ky2AF9aFFKeftLkMMYL eMNJ9p3Vf0kLvPeiaCXwb0M9+ujlyEs= From: Cai Huoqing To: cai.huoqing@linux.dev Cc: Sanjay R Mehta , Shyam Sundar S K , Jon Mason , Dave Jiang , Allen Hubbe , Frank Li , ntb@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/3] ntb: epf: Remove redundant pci_clear_master Date: Fri, 24 Mar 2023 09:32:19 +0800 Message-Id: <20230324013224.5963-2-cai.huoqing@linux.dev> In-Reply-To: <20230324013224.5963-1-cai.huoqing@linux.dev> References: <20230324013224.5963-1-cai.huoqing@linux.dev> Precedence: bulk X-Mailing-List: ntb@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Remove pci_clear_master to simplify the code, the bus-mastering is also cleared in do_pci_disable_device, like this: ./drivers/pci/pci.c:2197 static void do_pci_disable_device(struct pci_dev *dev) { u16 pci_command; pci_read_config_word(dev, PCI_COMMAND, &pci_command); if (pci_command & PCI_COMMAND_MASTER) { pci_command &= ~PCI_COMMAND_MASTER; pci_write_config_word(dev, PCI_COMMAND, pci_command); } pcibios_disable_device(dev); }. And dev->is_busmaster is set to 0 in pci_disable_device. Signed-off-by: Cai Huoqing --- v1->v2: Fix the removed label-err_dma_mask v1 link: https://lore.kernel.org/lkml/20230323115336.12986-2-cai.huoqing@linux.dev/ drivers/ntb/hw/epf/ntb_hw_epf.c | 12 ++++-------- 1 file changed, 4 insertions(+), 8 deletions(-) diff --git a/drivers/ntb/hw/epf/ntb_hw_epf.c b/drivers/ntb/hw/epf/ntb_hw_epf.c index 3ece49cb18ff..b640aa0bf45e 100644 --- a/drivers/ntb/hw/epf/ntb_hw_epf.c +++ b/drivers/ntb/hw/epf/ntb_hw_epf.c @@ -591,7 +591,7 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev, ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32)); if (ret) { dev_err(dev, "Cannot set DMA mask\n"); - goto err_dma_mask; + goto err_pci_regions; } dev_warn(&pdev->dev, "Cannot DMA highmem\n"); } @@ -599,14 +599,14 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev, ndev->ctrl_reg = pci_iomap(pdev, ndev->ctrl_reg_bar, 0); if (!ndev->ctrl_reg) { ret = -EIO; - goto err_dma_mask; + goto err_pci_regions; } if (ndev->peer_spad_reg_bar) { ndev->peer_spad_reg = pci_iomap(pdev, ndev->peer_spad_reg_bar, 0); if (!ndev->peer_spad_reg) { ret = -EIO; - goto err_dma_mask; + goto err_pci_regions; } } else { spad_sz = 4 * readl(ndev->ctrl_reg + NTB_EPF_SPAD_COUNT); @@ -617,14 +617,11 @@ static int ntb_epf_init_pci(struct ntb_epf_dev *ndev, ndev->db_reg = pci_iomap(pdev, ndev->db_reg_bar, 0); if (!ndev->db_reg) { ret = -EIO; - goto err_dma_mask; + goto err_pci_regions; } return 0; -err_dma_mask: - pci_clear_master(pdev); - err_pci_regions: pci_disable_device(pdev); @@ -642,7 +639,6 @@ static void ntb_epf_deinit_pci(struct ntb_epf_dev *ndev) pci_iounmap(pdev, ndev->peer_spad_reg); pci_iounmap(pdev, ndev->db_reg); - pci_clear_master(pdev); pci_release_regions(pdev); pci_disable_device(pdev); pci_set_drvdata(pdev, NULL); -- 2.34.1