[Lkw] [PATCH 2/6] nvme-cmb: add the basic PCI boilerplate code

[Emmanuel Arias]

Set the device into bus mastering mode, enable it and claim the
MMIO regions.

Signed-off-by: Emmanuel Arias <eamanu at riseup.net>
---
 drivers/block/nvme-cmb.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/block/nvme-cmb.c b/drivers/block/nvme-cmb.c
index e98f06ed0..ea2993c06 100644
--- a/drivers/block/nvme-cmb.c
+++ b/drivers/block/nvme-cmb.c
@@ -7,13 +7,31 @@ MODULE_LICENSE("GPL");
 
 static int nvme_cmb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
+	int error;
+
 	dev_info(&pdev->dev, "found NVMe device\n");
+	
+	pci_set_master(pdev);
+	error = pci_enable_device_mem(pdev);
+	if (error)
+		return error;
+	error = pci_request_mem_regions(pdev, "nvme-cmb");
+	if (error)
+		goto out_disable_device;
+		
 	return 0;
+
+out_disable_device:
+	pci_disable_device(pdev);
+	return error;
 }
 
 static void nvme_cmb_remove(struct pci_dev *pdev)
 {
 	dev_info(&pdev->dev, "unbinding NVMe device\n");
+
+	pci_release_mem_regions(pdev);
+	pci_disable_device(pdev);
 }
 
 static const struct pci_device_id nvme_cmb_id_table[] = {
-- 
2.39.2