[PATCH v4 42/50] scsi: qla1280: Move the SCSI pointer to private command data

Bart Van Assche
2022-02-16T21:04:48Z

Set .cmd_size in the SCSI host template instead of using the SCSI pointer
from struct scsi_cmnd. This patch prepares for removal of the SCSI pointer
from struct scsi_cmnd.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
---
drivers/scsi/qla1280.c | 21 ++++-----------------
drivers/scsi/qla1280.h | 3 +--
2 files changed, 5 insertions(+), 19 deletions(-)

diff --git a/drivers/scsi/qla1280.c b/drivers/scsi/qla1280.c
index 1dc56f4c89d8..0ab595c0870a 100644
--- a/drivers/scsi/qla1280.c
+++ b/drivers/scsi/qla1280.c
@@ -477,13 +477,6 @@ __setup("qla1280=", qla1280_setup);
#endif

-/*
- * We use the scsi_pointer structure that's included with each scsi_command
- * to overlay our struct srb over it. qla1280_init() checks that a srb is not
- * bigger than a scsi_pointer.
- */
-
-#define CMD_SP(Cmnd) &Cmnd->SCp
#define CMD_CDBLEN(Cmnd) Cmnd->cmd_len
#define CMD_CDBP(Cmnd) Cmnd->cmnd
#define CMD_SNSP(Cmnd) Cmnd->sense_buffer
@@ -693,7 +686,7 @@ static int qla1280_queuecommand_lck(struct scsi_cmnd *cmd)
{
struct Scsi_Host *host = cmd->device->host;
struct scsi_qla_host *ha = (struct scsi_qla_host *)host->hostdata;
- struct srb *sp = (struct srb *)CMD_SP(cmd);
+ struct srb *sp = scsi_cmd_priv(cmd);
int status;

sp->cmd = cmd;
@@ -828,7 +821,7 @@ qla1280_error_action(struct scsi_cmnd *cmd, enum action action)
ENTER("qla1280_error_action");

ha = (struct scsi_qla_host *)(CMD_HOST(cmd)->hostdata);
- sp = (struct srb *)CMD_SP(cmd);
+ sp = scsi_cmd_priv(cmd);
bus = SCSI_BUS_32(cmd);
target = SCSI_TCN_32(cmd);
lun = SCSI_LUN_32(cmd);
@@ -3959,7 +3952,7 @@ __qla1280_print_scsi_cmd(struct scsi_cmnd *cmd)
int i;
ha = (struct scsi_qla_host *)host->hostdata;

- sp = (struct srb *)CMD_SP(cmd);
+ sp = scsi_cmd_priv(cmd);
printk("SCSI Command @= 0x%p, Handle=0x%p\n", cmd, CMD_HANDLE(cmd));
printk(" chan=%d, target = 0x%02x, lun = 0x%02x, cmd_len = 0x%02x\n",
SCSI_BUS_32(cmd), SCSI_TCN_32(cmd), SCSI_LUN_32(cmd),
@@ -3979,7 +3972,6 @@ __qla1280_print_scsi_cmd(struct scsi_cmnd *cmd)
} */
printk(" tag=%d, transfersize=0x%x \n",
scsi_cmd_to_rq(cmd)->tag, cmd->transfersize);
- printk(" SP=0x%p\n", CMD_SP(cmd));
printk(" underflow size = 0x%x, direction=0x%x\n",
cmd->underflow, cmd->sc_data_direction);
}
@@ -4139,6 +4131,7 @@ static struct scsi_host_template qla1280_driver_template = {
.can_queue = MAX_OUTSTANDING_COMMANDS,
.this_id = -1,
.sg_tablesize = SG_ALL,
+ .cmd_size = sizeof(struct srb),
};

@@ -4351,12 +4344,6 @@ static struct pci_driver qla1280_pci_driver = {
static int __init
qla1280_init(void)
{
- if (sizeof(struct srb) > sizeof(struct scsi_pointer)) {
- printk(KERN_WARNING
- "qla1280: struct srb too big, aborting\n");
- return -EINVAL;
- }
-
#ifdef MODULE
/*
* If we are called as a module, the qla1280 pointer may not be null
diff --git a/drivers/scsi/qla1280.h b/drivers/scsi/qla1280.h
index e7820b5bca38..d309e2ca14de 100644
--- a/drivers/scsi/qla1280.h
+++ b/drivers/scsi/qla1280.h
@@ -87,8 +87,7 @@
#define RESPONSE_ENTRY_CNT 63 /* Number of response entries. */

/*
- * SCSI Request Block structure (sp) that is placed
- * on cmd->SCp location of every I/O
+ * SCSI Request Block structure (sp) that occurs after each struct scsi_cmnd.
*/
struct srb {
struct list_head list; /* (8/16) LU queue */