UBUNTU: SAUCE: storvsc: use small sg_tablesize on x86

BugLink: http://bugs.launchpad.net/bugs/1495983

OriginalAuthor: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Signed-off-by: Brad Figg <brad.figg@canonical.com>

drivers/scsi/storvsc_drv.c

@@ -1633,6 +1633,11 @@ static int storvsc_probe(struct hv_device *device,
 	 * from the host.
 	 */
 	host->sg_tablesize = (stor_device->max_transfer_bytes >> PAGE_SHIFT);
+#if defined(CONFIG_X86_32)
+	dev_warn(&device->device, "adjusting sg_tablesize 0x%x -> 0x%x",
+			host->sg_tablesize, MAX_MULTIPAGE_BUFFER_COUNT);
+	host->sg_tablesize = MAX_MULTIPAGE_BUFFER_COUNT;
+#endif
 
 	/* Register the HBA and start the scsi bus scan */
 	ret = scsi_add_host(host, &device->device);