linux-kernel - [PATCH 1/2] Enable PCI bus mastering by default

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Message-Id: <d5c91b79b9162faee93f2adeca0ca83797256b87.1473847321.git.jthumshirn@suse.de>
Date:   Wed, 14 Sep 2016 12:05:23 +0200
From:   Johannes Thumshirn <jthumshirn@...e.de>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Michael Moese <michael.moese@....de>,
        Johannes Thumshirn <jthumshirn@...e.de>
Subject: [PATCH 1/2] Enable PCI bus mastering by default

From: Michael Moese <michael.moese@....de>

In order to successfully perform DMA operations on PCI devices,
it is necessary to enble PCI bus mastering, so enable it by default.

Signed-off-by: Michael Moese <michael.moese@....de>
Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>
---
 drivers/mcb/mcb-pci.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index b15a034..af4d2f2 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -46,6 +46,7 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		dev_err(&pdev->dev, "Failed to enable PCI device\n");
 		return -ENODEV;
 	}
+	pci_set_master(pdev);
 
 	priv->mapbase = pci_resource_start(pdev, 0);
 	if (!priv->mapbase) {
-- 
1.8.5.6