From: Michael S. Tsirkin <mst@redhat.com>
Date: Sun, 14 Dec 2014 14:55:44 +0000 (+0200)
Subject: virtio: core support for config generation
X-Git-Tag: omap-for-v3.19/fixes-rc1~32^2~10
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d71de9ec6ba806104439d3a669befda84757b5af;p=pandora-kernel.git

virtio: core support for config generation

virtio 1.0 spec says:

Drivers MUST NOT assume reads from fields greater than 32 bits wide are
atomic, nor are reads from multiple fields: drivers SHOULD read device
configuration space fields like so:
	u32 before, after;
	do {
		before = get_config_generation(device);
		// read config entry/entries.
		after = get_config_generation(device);
	} while (after != before);

Do exactly this, for transports that support it.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

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