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authorMarc Zyngier <marc.zyngier@arm.com>2013-11-05 14:51:28 +0400
committerRusty Russell <rusty@rustcorp.com.au>2013-11-07 05:43:04 +0400
commit4ae85370720156025e9cb873c13a0afb06ca1612 (patch)
tree3f2fc075e48cdfb64df2dd659a3acc656308f18a /drivers/virtio/virtio_mmio.c
parent2342d6a6512ce5a3d2433bf77e6580e738cfd709 (diff)
downloadlinux-4ae85370720156025e9cb873c13a0afb06ca1612.tar.xz
virtio: mmio: fix signature checking for BE guests
As virtio-mmio config registers are specified to be little-endian, using readl() to read the magic value and then memcmp() to check it fails on BE (as readl() has an implicit swab). Fix it by encoding the magic value as an integer instead of a string. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Acked-by: Pawel Moll <pawel.moll@arm.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'drivers/virtio/virtio_mmio.c')
-rw-r--r--drivers/virtio/virtio_mmio.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
index e9fdeb861992..c600ccfd6922 100644
--- a/drivers/virtio/virtio_mmio.c
+++ b/drivers/virtio/virtio_mmio.c
@@ -471,7 +471,7 @@ static int virtio_mmio_probe(struct platform_device *pdev)
/* Check magic value */
magic = readl(vm_dev->base + VIRTIO_MMIO_MAGIC_VALUE);
- if (memcmp(&magic, "virt", 4) != 0) {
+ if (magic != ('v' | 'i' << 8 | 'r' << 16 | 't' << 24)) {
dev_warn(&pdev->dev, "Wrong magic value 0x%08lx!\n", magic);
return -ENODEV;
}