mtd: rawnand: qcom: Early structure initialization

Instead of allocating a structure on the stack with random data and then
expect the callee to perform the initialization (which is, in general,
error prone), prefer zeroing the structure explicitly at allocation and
provide the already zeroed area, so no explicit memset operation is
needed. It is probably safer to do so, so we limit the timeframe when
dirty data could actually be accessed by mistake.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Manivannan Sadhasivam <mani@kernel.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/linux-mtd/20230716144612.32132-8-miquel.raynal@bootlin.com

Author: miquelraynal

drivers/mtd/nand/raw/qcom_nandc.c

@@ -2600,8 +2600,6 @@ static void qcom_parse_instructions(struct nand_chip *chip,
 	unsigned int op_id;
 	int i;
 
-	memset(q_op, 0, sizeof(*q_op));
-
 	for (op_id = 0; op_id < subop->ninstrs; op_id++) {
 		unsigned int offset, naddrs;
 		const u8 *addrs;
@@ -2681,7 +2679,7 @@ static int qcom_read_status_exec(struct nand_chip *chip,
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct nand_ecc_ctrl *ecc = &chip->ecc;
-	struct qcom_op q_op;
+	struct qcom_op q_op = {};
 	const struct nand_op_instr *instr = NULL;
 	unsigned int op_id = 0;
 	unsigned int len = 0;
@@ -2744,7 +2742,7 @@ static int qcom_read_id_type_exec(struct nand_chip *chip, const struct nand_subo
 {
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
-	struct qcom_op q_op;
+	struct qcom_op q_op = {};
 	const struct nand_op_instr *instr = NULL;
 	unsigned int op_id = 0;
 	unsigned int len = 0;
@@ -2795,7 +2793,7 @@ static int qcom_misc_cmd_type_exec(struct nand_chip *chip, const struct nand_sub
 {
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
-	struct qcom_op q_op;
+	struct qcom_op q_op = {};
 	int ret = 0;
 
 	qcom_parse_instructions(chip, subop, &q_op);
@@ -2838,7 +2836,7 @@ static int qcom_param_page_type_exec(struct nand_chip *chip,  const struct nand_
 {
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-	struct qcom_op q_op;
+	struct qcom_op q_op = {};
 	const struct nand_op_instr *instr = NULL;
 	unsigned int op_id = 0;
 	unsigned int len = 0;
@@ -2935,7 +2933,7 @@ static int qcom_erase_cmd_type_exec(struct nand_chip *chip, const struct nand_su
 {
 	struct qcom_nand_host *host = to_qcom_nand_host(chip);
 	struct qcom_nand_controller *nandc = get_qcom_nand_controller(chip);
-	struct qcom_op q_op;
+	struct qcom_op q_op = {};
 	int ret = 0;
 
 	qcom_parse_instructions(chip, subop, &q_op);