From: Arvind Yadav <arvind.yadav.cs@gmail.com>
Date: Tue, 3 Jan 2017 11:56:46 +0000 (+0530)
Subject: vfio-pci: Handle error from pci_iomap
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=e19f32da5ded958238eac1bbe001192acef191a2;p=linux-beck.git

vfio-pci: Handle error from pci_iomap

Here, pci_iomap can fail, handle this case release selected
pci regions and return -ENOMEM.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index dcd7c2a99618..324c52e3a1a4 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++ b/drivers/vfio/pci/vfio_pci.c
@@ -1142,6 +1142,10 @@ static int vfio_pci_mmap(void *device_data, struct vm_area_struct *vma)
 			return ret;
 
 		vdev->barmap[index] = pci_iomap(pdev, index, 0);
+		if (!vdev->barmap[index]) {
+			pci_release_selected_regions(pdev, 1 << index);
+			return -ENOMEM;
+		}
 	}
 
 	vma->vm_private_data = vdev;