[PATCH 5.1 38/96] scsi: hpsa: correct ioaccel2 chaining

Greg Kroah-Hartman
2019-07-08T15:37:19Z

[ Upstream commit 625d7d3518875c4d303c652a198feaa13d9f52d9 ]

- set ioaccel2_sg_element member 'chain_indicator' to IOACCEL2_LAST_SG for
the last s/g element.

- set ioaccel2_sg_element member 'chain_indicator' to IOACCEL2_CHAIN when
chaining.

Reviewed-by: Bader Ali - Saleh <bader.alisaleh@microsemi.com>
Reviewed-by: Scott Teel <scott.teel@microsemi.com>
Reviewed-by: Matt Perricone <matt.perricone@microsemi.com>
Signed-off-by: Don Brace <don.brace@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/scsi/hpsa.c | 7 ++++++-
drivers/scsi/hpsa_cmd.h | 1 +
2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index f044e7d10d63..2d181e5e65ff 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -4925,7 +4925,7 @@ static int hpsa_scsi_ioaccel2_queue_command(struct ctlr_info *h,
curr_sg->reserved[0] = 0;
curr_sg->reserved[1] = 0;
curr_sg->reserved[2] = 0;
- curr_sg->chain_indicator = 0x80;
+ curr_sg->chain_indicator = IOACCEL2_CHAIN;

curr_sg = h->ioaccel2_cmd_sg_list[c->cmdindex];
}
@@ -4942,6 +4942,11 @@ static int hpsa_scsi_ioaccel2_queue_command(struct ctlr_info *h,
curr_sg++;
}

+ /*
+ * Set the last s/g element bit
+ */
+ (curr_sg - 1)->chain_indicator = IOACCEL2_LAST_SG;
+
switch (cmd->sc_data_direction) {
case DMA_TO_DEVICE:
cp->direction &= ~IOACCEL2_DIRECTION_MASK;
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 21a726e2eec6..f6afca4b2319 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -517,6 +517,7 @@ struct ioaccel2_sg_element {
u8 reserved[3];
u8 chain_indicator;
#define IOACCEL2_CHAIN 0x80
+#define IOACCEL2_LAST_SG 0x40
};

/*
--
2.20.1