[PATCH] scsi: megaraid_sas: Use struct_size() helper

["Gustavo A. R. Silva" <gustavo@embeddedor.com>]

One of the more common cases of allocation size calculations is finding
the size of a structure that has a zero-sized array at the end, along
with memory for some number of elements for that array. For example:

struct MR_PD_CFG_SEQ_NUM_SYNC {
	...
        struct MR_PD_CFG_SEQ seq[1];
} __packed;

Make use of the struct_size() helper instead of an open-coded version
in order to avoid any potential type mistakes.

So, replace the following form:

sizeof(struct MR_PD_CFG_SEQ_NUM_SYNC) + (sizeof(struct MR_PD_CFG_SEQ) * (MAX_PHYSICAL_DEVICES - 1))

with:

struct_size(pd_sync, seq, MAX_PHYSICAL_DEVICES - 1)

This code was detected with the help of Coccinelle.

Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
 drivers/scsi/megaraid/megaraid_sas_fusion.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index a25b6b4b6548..56bd524dddbf 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -1191,7 +1191,7 @@ megasas_ioc_init_fusion(struct megasas_instance *instance)
 int
 megasas_sync_pd_seq_num(struct megasas_instance *instance, bool pend) {
 	int ret = 0;
-	u32 pd_seq_map_sz;
+	size_t pd_seq_map_sz;
 	struct megasas_cmd *cmd;
 	struct megasas_dcmd_frame *dcmd;
 	struct fusion_context *fusion = instance->ctrl_context;
@@ -1200,9 +1200,7 @@ megasas_sync_pd_seq_num(struct megasas_instance *instance, bool pend) {
 
 	pd_sync = (void *)fusion->pd_seq_sync[(instance->pd_seq_map_id & 1)];
 	pd_seq_h = fusion->pd_seq_phys[(instance->pd_seq_map_id & 1)];
-	pd_seq_map_sz = sizeof(struct MR_PD_CFG_SEQ_NUM_SYNC) +
-			(sizeof(struct MR_PD_CFG_SEQ) *
-			(MAX_PHYSICAL_DEVICES - 1));
+	pd_seq_map_sz = struct_size(pd_sync, seq, MAX_PHYSICAL_DEVICES - 1);
 
 	cmd = megasas_get_cmd(instance);
 	if (!cmd) {
-- 
2.21.0