From: Long Li longli@microsoft.com
Following the ring header, the ring data should align to system page boundary. Adjust the size if necessary.
Cc: stable@vger.kernel.org Fixes: 95096f2fbd10 ("uio-hv-generic: new userspace i/o driver for VMBus") Signed-off-by: Long Li longli@microsoft.com --- drivers/uio/uio_hv_generic.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/uio/uio_hv_generic.c b/drivers/uio/uio_hv_generic.c index 08385b04c4ab..dfc5f0e1a254 100644 --- a/drivers/uio/uio_hv_generic.c +++ b/drivers/uio/uio_hv_generic.c @@ -256,6 +256,12 @@ hv_uio_probe(struct hv_device *dev, if (!ring_size) ring_size = SZ_2M;
+ /* + * Adjust ring size if necessary to have the ring data region page + * aligned + */ + ring_size = VMBUS_RING_SIZE(ring_size); + pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL); if (!pdata) return -ENOMEM;