NVMe: Add result to nvme_get_features

nvme_get_features() was not returning the result.  Add a parameter
to return the result in (similar to nvme_set_features()) and change
all callers.
Signed-off-by: NKeith Busch <keith.busch@intel.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

drivers/block/nvme.c

@@ -838,8 +838,8 @@ static int nvme_identify(struct nvme_dev *dev, unsigned nsid, unsigned cns,
 	return nvme_submit_admin_cmd(dev, &c, NULL);
 }
 
-static int nvme_get_features(struct nvme_dev *dev, unsigned fid,
-				unsigned nsid, dma_addr_t dma_addr)
+static int nvme_get_features(struct nvme_dev *dev, unsigned fid, unsigned nsid,
+					dma_addr_t dma_addr, u32 *result)
 {
 	struct nvme_command c;
 
@@ -849,7 +849,7 @@ static int nvme_get_features(struct nvme_dev *dev, unsigned fid,
 	c.features.prp1 = cpu_to_le64(dma_addr);
 	c.features.fid = cpu_to_le32(fid);
 
-	return nvme_submit_admin_cmd(dev, &c, NULL);
+	return nvme_submit_admin_cmd(dev, &c, result);
 }
 
 static int nvme_set_features(struct nvme_dev *dev, unsigned fid,
@@ -1535,7 +1535,7 @@ static int __devinit nvme_dev_add(struct nvme_dev *dev)
 			continue;
 
 		res = nvme_get_features(dev, NVME_FEAT_LBA_RANGE, i,
-							dma_addr + 4096);
+							dma_addr + 4096, NULL);
 		if (res)
 			continue;