[PATCH v2 3/3] scsi: don't add scsi command result bytes

Johannes Thumshirn
2018-06-13T07:53:49Z

Some drivers are ADDing the scsi command's result bytes instead of
ORing them.

While this can produce correct results it has unexpected side effects.

Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>

---
Changes since v1:
- Fix kbuild robot warnings
---
drivers/scsi/imm.c | 2 +-
drivers/scsi/mesh.c | 4 ++--
drivers/scsi/sym53c8xx_2/sym_glue.c | 2 +-
drivers/scsi/sym53c8xx_2/sym_glue.h | 2 +-
4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/scsi/imm.c b/drivers/scsi/imm.c
index 87c94191033b..c8b3de035630 100644
--- a/drivers/scsi/imm.c
+++ b/drivers/scsi/imm.c
@@ -892,7 +892,7 @@ static int imm_engine(imm_struct *dev, struct scsi_cmnd *cmd)
/* Check for optional message byte */
if (imm_wait(dev) == (unsigned char) 0xb8)
imm_in(dev, &h, 1);
- cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
+ cmd->result = DID_OK << 16 | (l & STATUS_MASK);
}
if ((dev->mode == IMM_NIBBLE) || (dev->mode == IMM_PS2)) {
w_ctr(ppb, 0x4);
diff --git a/drivers/scsi/mesh.c b/drivers/scsi/mesh.c
index 1753e42826dd..3473a860e690 100644
--- a/drivers/scsi/mesh.c
+++ b/drivers/scsi/mesh.c
@@ -594,9 +594,9 @@ static void mesh_done(struct mesh_state *ms, int start_next)
ms->current_req = NULL;
tp->current_req = NULL;
if (cmd) {
- cmd->result = (ms->stat << 16) + cmd->SCp.Status;
+ cmd->result = ms->stat << 16 | cmd->SCp.Status;
if (ms->stat == DID_OK)
- cmd->result += (cmd->SCp.Message << 8);
+ cmd->result |= cmd->SCp.Message << 8;
if (DEBUG_TARGET(cmd)) {
printk(KERN_DEBUG "mesh_done: result = %x, data_ptr=%d, buflen=%d\n",
cmd->result, ms->data_ptr, scsi_bufflen(cmd));
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.c b/drivers/scsi/sym53c8xx_2/sym_glue.c
index 7320d5fe4cbc..afdbd5a66083 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.c
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.c
@@ -252,7 +252,7 @@ void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid)
cam_status = sym_xerr_cam_status(DID_ERROR, cp->xerr_status);
}
scsi_set_resid(cmd, resid);
- cmd->result = (drv_status << 24) + (cam_status << 16) + scsi_status;
+ cmd->result = drv_status << 24 | cam_status << 16 | scsi_status;
}

static int sym_scatter(struct sym_hcb *np, struct sym_ccb *cp, struct scsi_cmnd *cmd)
diff --git a/drivers/scsi/sym53c8xx_2/sym_glue.h b/drivers/scsi/sym53c8xx_2/sym_glue.h
index 805369521df8..ec4af5e85142 100644
--- a/drivers/scsi/sym53c8xx_2/sym_glue.h
+++ b/drivers/scsi/sym53c8xx_2/sym_glue.h
@@ -256,7 +256,7 @@ sym_get_cam_status(struct scsi_cmnd *cmd)
static inline void sym_set_cam_result_ok(struct sym_ccb *cp, struct scsi_cmnd *cmd, int resid)
{
scsi_set_resid(cmd, resid);
- cmd->result = (((DID_OK) << 16) + ((cp->ssss_status) & 0x7f));
+ cmd->result = DID_OK << 16 | (cp->ssss_status & 0x7f);
}
void sym_set_cam_result_error(struct sym_hcb *np, struct sym_ccb *cp, int resid);

--
2.16.4