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authorCornelia Huck <cornelia.huck@de.ibm.com>2016-03-01 13:44:53 +0100
committerMichael S. Tsirkin <mst@redhat.com>2016-03-02 18:08:59 +0200
commitc235082b50f6dd81436b82fd73ffbdeede4ec2e4 (patch)
tree192e331d7ffe35adaa63755e58c00dfe727a74bf /drivers/s390/virtio
parentvirtio/s390: use dev_to_virtio (diff)
downloadlinux-dev-c235082b50f6dd81436b82fd73ffbdeede4ec2e4.tar.xz
linux-dev-c235082b50f6dd81436b82fd73ffbdeede4ec2e4.zip
virtio/s390: size of SET_IND payload
SET_IND takes as a payload the _address_ of the indicators, meaning that we have one of the rare cases where kmalloc(sizeof(&...)) is actually correct. Let's clarify that with a comment. The count for the ccw, however, was only correct because the indicators are 64 bit. Let's use the correct value. Reported-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Reviewed-by: Halil Pasic <pasic@linux.vnet.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/s390/virtio')
-rw-r--r--drivers/s390/virtio/virtio_ccw.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c
index 46b110a124b0..8688ad4c825f 100644
--- a/drivers/s390/virtio/virtio_ccw.c
+++ b/drivers/s390/virtio/virtio_ccw.c
@@ -342,13 +342,14 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev,
ccw->count = sizeof(*thinint_area);
ccw->cda = (__u32)(unsigned long) thinint_area;
} else {
+ /* payload is the address of the indicators */
indicatorp = kmalloc(sizeof(&vcdev->indicators),
GFP_DMA | GFP_KERNEL);
if (!indicatorp)
return;
*indicatorp = 0;
ccw->cmd_code = CCW_CMD_SET_IND;
- ccw->count = sizeof(vcdev->indicators);
+ ccw->count = sizeof(&vcdev->indicators);
ccw->cda = (__u32)(unsigned long) indicatorp;
}
/* Deregister indicators from host. */
@@ -656,7 +657,10 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
}
}
ret = -ENOMEM;
- /* We need a data area under 2G to communicate. */
+ /*
+ * We need a data area under 2G to communicate. Our payload is
+ * the address of the indicators.
+ */
indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL);
if (!indicatorp)
goto out;
@@ -672,7 +676,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
vcdev->indicators = 0;
ccw->cmd_code = CCW_CMD_SET_IND;
ccw->flags = 0;
- ccw->count = sizeof(vcdev->indicators);
+ ccw->count = sizeof(&vcdev->indicators);
ccw->cda = (__u32)(unsigned long) indicatorp;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND);
if (ret)
@@ -683,7 +687,7 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs,
vcdev->indicators2 = 0;
ccw->cmd_code = CCW_CMD_SET_CONF_IND;
ccw->flags = 0;
- ccw->count = sizeof(vcdev->indicators2);
+ ccw->count = sizeof(&vcdev->indicators2);
ccw->cda = (__u32)(unsigned long) indicatorp;
ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND);
if (ret)