[PATCH] device_handler: remove VLAs

Stephen Kitt
2018-03-09T22:32:11Z

In preparation to enabling -Wvla, remove VLAs and replace them with
fixed-length arrays instead.

scsi_dh_{alua,emc,rdac} use variable-length array declarations to
store command blocks, with the appropriate size as determined by
COMMAND_SIZE. This patch replaces these with fixed-sized arrays using
MAX_COMMAND_SIZE, so that the array size can be determined at compile
time.

This was prompted by https://lkml.org/lkml/2018/3/7/621

Signed-off-by: Stephen Kitt <steve@sk2.org>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 8 ++++----
drivers/scsi/device_handler/scsi_dh_emc.c | 2 +-
drivers/scsi/device_handler/scsi_dh_rdac.c | 2 +-
3 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index 4b44325d1a82..982a52528a1c 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -138,12 +138,12 @@ static void release_port_group(struct kref *kref)
static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
int bufflen, struct scsi_sense_hdr *sshdr, int flags)
{
- u8 cdb[COMMAND_SIZE(MAINTENANCE_IN)];
+ u8 cdb[MAX_COMMAND_SIZE];
int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
REQ_FAILFAST_DRIVER;

/* Prepare the command. */
- memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_IN));
+ memset(cdb, 0x0, MAX_COMMAND_SIZE);
cdb[0] = MAINTENANCE_IN;
if (!(flags & ALUA_RTPG_EXT_HDR_UNSUPP))
cdb[1] = MI_REPORT_TARGET_PGS | MI_EXT_HDR_PARAM_FMT;
@@ -166,7 +166,7 @@ static int submit_rtpg(struct scsi_device *sdev, unsigned char *buff,
static int submit_stpg(struct scsi_device *sdev, int group_id,
struct scsi_sense_hdr *sshdr)
{
- u8 cdb[COMMAND_SIZE(MAINTENANCE_OUT)];
+ u8 cdb[MAX_COMMAND_SIZE];
unsigned char stpg_data[8];
int stpg_len = 8;
int req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
@@ -178,7 +178,7 @@ static int submit_stpg(struct scsi_device *sdev, int group_id,
put_unaligned_be16(group_id, &stpg_data[6]);

/* Prepare the command. */
- memset(cdb, 0x0, COMMAND_SIZE(MAINTENANCE_OUT));
+ memset(cdb, 0x0, MAX_COMMAND_SIZE);
cdb[0] = MAINTENANCE_OUT;
cdb[1] = MO_SET_TARGET_PGS;
put_unaligned_be32(stpg_len, &cdb[6]);
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index 6a2792f3a37e..95c47909a58f 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -249,7 +249,7 @@ static int send_trespass_cmd(struct scsi_device *sdev,
struct clariion_dh_data *csdev)
{
unsigned char *page22;
- unsigned char cdb[COMMAND_SIZE(MODE_SELECT)];
+ unsigned char cdb[MAX_COMMAND_SIZE];
int err, res = SCSI_DH_OK, len;
struct scsi_sense_hdr sshdr;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index 7af31a1247ee..d27fabae8ddd 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -533,7 +533,7 @@ static void send_mode_select(struct work_struct *work)
int err = SCSI_DH_OK, retry_cnt = RDAC_RETRY_COUNT;
struct rdac_queue_data *tmp, *qdata;
LIST_HEAD(list);
- unsigned char cdb[COMMAND_SIZE(MODE_SELECT_10)];
+ unsigned char cdb[MAX_COMMAND_SIZE];
struct scsi_sense_hdr sshdr;
unsigned int data_size;
u64 req_flags = REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT |
--
2.11.0