linux-kernel - [PATCH 5/6] virtio/scsi: verify device has config space

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Message-ID: <1421160167-18498-6-git-send-email-mst@redhat.com>
Date:	Tue, 13 Jan 2015 16:43:24 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	linux-scsi@...r.kernel.org
Subject: [PATCH 5/6] virtio/scsi: verify device has config space

Some devices might not implement config space access
(e.g. remoteproc used not to - before 3.9).
virtio/scsi needs config space access so make it
fail gracefully if not there.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 drivers/scsi/virtio_scsi.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c
index c52bb5d..f164f24 100644
--- a/drivers/scsi/virtio_scsi.c
+++ b/drivers/scsi/virtio_scsi.c
@@ -950,6 +950,12 @@ static int virtscsi_probe(struct virtio_device *vdev)
 	u32 num_queues;
 	struct scsi_host_template *hostt;
 
+	if (!vdev->config->get) {
+		dev_err(&vdev->dev, "%s failure: config access disabled\n",
+			__func__);
+		return -EINVAL;
+	}
+
 	/* We need to know how many queues before we allocate. */
 	num_queues = virtscsi_config_get(vdev, num_queues) ? : 1;
 
-- 
MST

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