uio_hv_generic: Align ring size to system page

Following the ring header, the ring data should align to system page
boundary. Adjust the size if necessary.

Cc: [email protected]
Fixes: 95096f2fbd ("uio-hv-generic: new userspace i/o driver for VMBus")
Signed-off-by: Long Li <[email protected]>
Reviewed-by: Michael Kelley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Wei Liu <[email protected]>
Message-ID: <[email protected]>

drivers/uio/uio_hv_generic.c

@@ -243,6 +243,9 @@ hv_uio_probe(struct hv_device *dev,
 	if (!ring_size)
 		ring_size = SZ_2M;
 
+	/* Adjust ring size if necessary to have it page aligned */
+	ring_size = VMBUS_RING_SIZE(ring_size);
+
 	pdata = devm_kzalloc(&dev->device, sizeof(*pdata), GFP_KERNEL);
 	if (!pdata)
 		return -ENOMEM;