From 8f8de4c1f3888273b5b7dfae29e87dce79d37b02 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Fri, 12 Jun 2009 22:16:37 -0600
Subject: [PATCH] --- yaml --- r: 147966 b: refs/heads/master c:
 a92892825a122a74ddad1d408fa27132e28b05ae h: refs/heads/master v: v3

---
 [refs]                        |  2 +-
 trunk/drivers/virtio/virtio.c | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 324e66119dab..a0a7cb8baa9a 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 82af8ce84ed65d2fb6d8c017d3f2bbbf161061fb
+refs/heads/master: a92892825a122a74ddad1d408fa27132e28b05ae
diff --git a/trunk/drivers/virtio/virtio.c b/trunk/drivers/virtio/virtio.c
index 3f52c767dfe9..bd0745250fd9 100644
--- a/trunk/drivers/virtio/virtio.c
+++ b/trunk/drivers/virtio/virtio.c
@@ -31,11 +31,27 @@ static ssize_t modalias_show(struct device *_d,
 	return sprintf(buf, "virtio:d%08Xv%08X\n",
 		       dev->id.device, dev->id.vendor);
 }
+static ssize_t features_show(struct device *_d,
+			     struct device_attribute *attr, char *buf)
+{
+	struct virtio_device *dev = container_of(_d, struct virtio_device, dev);
+	unsigned int i;
+	ssize_t len = 0;
+
+	/* We actually represent this as a bitstring, as it could be
+	 * arbitrary length in future. */
+	for (i = 0; i < ARRAY_SIZE(dev->features)*BITS_PER_LONG; i++)
+		len += sprintf(buf+len, "%c",
+			       test_bit(i, dev->features) ? '1' : '0');
+	len += sprintf(buf+len, "\n");
+	return len;
+}
 static struct device_attribute virtio_dev_attrs[] = {
 	__ATTR_RO(device),
 	__ATTR_RO(vendor),
 	__ATTR_RO(status),
 	__ATTR_RO(modalias),
+	__ATTR_RO(features),
 	__ATTR_NULL
 };