NVMe: Use kzalloc instead of kmalloc+memset

Use kzalloc instead of kmalloc and a susbsequent memset.
Signed-off-by: NTushar Behera <tushar.behera@linaro.org>
Signed-off-by: NVishal Verma <vishal.l.verma@linux.intel.com>
Signed-off-by: NMatthew Wilcox <matthew.r.wilcox@intel.com>

drivers/block/nvme-scsi.c

@@ -933,13 +933,12 @@ static int nvme_trans_bdev_char_page(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	int res = SNTI_TRANSLATION_SUCCESS;
 	int xfer_len;
 
-	inq_response = kmalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
+	inq_response = kzalloc(EXTENDED_INQUIRY_DATA_PAGE_LENGTH, GFP_KERNEL);
 	if (inq_response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;
 	}
 
-	memset(inq_response, 0, EXTENDED_INQUIRY_DATA_PAGE_LENGTH);
 	inq_response[1] = INQ_BDEV_CHARACTERISTICS_PAGE;    /* Page Code */
 	inq_response[2] = 0x00;    /* Page Length MSB */
 	inq_response[3] = 0x3C;    /* Page Length LSB */
@@ -964,12 +963,11 @@ static int nvme_trans_log_supp_pages(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	int xfer_len;
 	u8 *log_response;
 
-	log_response = kmalloc(LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH, GFP_KERNEL);
+	log_response = kzalloc(LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH, GFP_KERNEL);
 	if (log_response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;
 	}
-	memset(log_response, 0, LOG_PAGE_SUPPORTED_LOG_PAGES_LENGTH);
 
 	log_response[0] = LOG_PAGE_SUPPORTED_LOG_PAGES_PAGE;
 	/* Subpage=0x00, Page Length MSB=0 */
@@ -1000,12 +998,11 @@ static int nvme_trans_log_info_exceptions(struct nvme_ns *ns,
 	u8 temp_c;
 	u16 temp_k;
 
-	log_response = kmalloc(LOG_INFO_EXCP_PAGE_LENGTH, GFP_KERNEL);
+	log_response = kzalloc(LOG_INFO_EXCP_PAGE_LENGTH, GFP_KERNEL);
 	if (log_response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;
 	}
-	memset(log_response, 0, LOG_INFO_EXCP_PAGE_LENGTH);
 
 	mem = dma_alloc_coherent(&dev->pci_dev->dev,
 					sizeof(struct nvme_smart_log),
@@ -1069,12 +1066,11 @@ static int nvme_trans_log_temperature(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	u8 temp_c_cur, temp_c_thresh;
 	u16 temp_k;
 
-	log_response = kmalloc(LOG_TEMP_PAGE_LENGTH, GFP_KERNEL);
+	log_response = kzalloc(LOG_TEMP_PAGE_LENGTH, GFP_KERNEL);
 	if (log_response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;
 	}
-	memset(log_response, 0, LOG_TEMP_PAGE_LENGTH);
 
 	mem = dma_alloc_coherent(&dev->pci_dev->dev,
 					sizeof(struct nvme_smart_log),
@@ -1380,12 +1376,11 @@ static int nvme_trans_mode_page_create(struct nvme_ns *ns,
 	blk_desc_offset = mph_size;
 	mode_pages_offset_1 = blk_desc_offset + blk_desc_len;
 
-	response = kmalloc(resp_size, GFP_KERNEL);
+	response = kzalloc(resp_size, GFP_KERNEL);
 	if (response == NULL) {
 		res = -ENOMEM;
 		goto out_mem;
 	}
-	memset(response, 0, resp_size);
 
 	res = nvme_trans_fill_mode_parm_hdr(&response[0], mph_size, cdb10,
 					llbaa, mode_data_length, blk_desc_len);
@@ -2480,12 +2475,11 @@ static int nvme_trans_read_capacity(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 	}
 	id_ns = mem;
 
-	response = kmalloc(resp_size, GFP_KERNEL);
+	response = kzalloc(resp_size, GFP_KERNEL);
 	if (response == NULL) {
 		res = -ENOMEM;
 		goto out_dma;
 	}
-	memset(response, 0, resp_size);
 	nvme_trans_fill_read_cap(response, id_ns, cdb16);
 
 	xfer_len = min(alloc_len, resp_size);
@@ -2554,12 +2548,11 @@ static int nvme_trans_report_luns(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 			goto out_dma;
 		}
 
-		response = kmalloc(resp_size, GFP_KERNEL);
+		response = kzalloc(resp_size, GFP_KERNEL);
 		if (response == NULL) {
 			res = -ENOMEM;
 			goto out_dma;
 		}
-		memset(response, 0, resp_size);
 
 		/* The first LUN ID will always be 0 per the SAM spec */
 		for (lun_id = 0; lun_id < le32_to_cpu(id_ctrl->nn); lun_id++) {
@@ -2600,12 +2593,11 @@ static int nvme_trans_request_sense(struct nvme_ns *ns, struct sg_io_hdr *hdr,
 
 	resp_size = ((desc_format) ? (DESC_FMT_SENSE_DATA_SIZE) :
 					(FIXED_FMT_SENSE_DATA_SIZE));
-	response = kmalloc(resp_size, GFP_KERNEL);
+	response = kzalloc(resp_size, GFP_KERNEL);
 	if (response == NULL) {
 		res = -ENOMEM;
 		goto out;
 	}
-	memset(response, 0, resp_size);
 
 	if (desc_format == DESCRIPTOR_FORMAT_SENSE_DATA_TYPE) {
 		/* Descriptor Format Sense Data */