linux-kernel - [PATCH RFC v2 14/24] hpsa: drop refcount field from CommandList

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Date:   Wed, 11 Mar 2020 00:25:40 +0800
From:   John Garry <john.garry@...wei.com>
To:     <axboe@...nel.dk>, <jejb@...ux.ibm.com>,
        <martin.petersen@...cle.com>, <hare@...e.de>,
        <ming.lei@...hat.com>, <bvanassche@....org>, <hch@...radead.org>
CC:     <linux-block@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-scsi@...r.kernel.org>,
        <virtualization@...ts.linux-foundation.org>,
        <esc.storagedev@...rosemi.com>, <chenxiang66@...ilicon.com>,
        Hannes Reinecke <hare@...e.com>
Subject: [PATCH RFC v2 14/24] hpsa: drop refcount field from CommandList

From: Hannes Reinecke <hare@...e.de>

Field is not unused, so drop it.

Signed-off-by: Hannes Reinecke <hare@...e.com>
---
 drivers/scsi/hpsa.c     | 12 ++----------
 drivers/scsi/hpsa_cmd.h |  1 -
 2 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index 64ec0b2c647a..f6de0f2beee2 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -5493,8 +5493,8 @@ static void hpsa_cmd_init(struct ctlr_info *h, int index,
 {
 	dma_addr_t cmd_dma_handle, err_dma_handle;
 
-	/* Zero out all of commandlist except the last field, refcount */
-	memset(c, 0, offsetof(struct CommandList, refcount));
+	/* Zero out all of commandlist */
+	memset(c, 0, sizeof(struct CommandList));
 	c->Header.tag = cpu_to_le64((u64) (index << DIRECT_LOOKUP_SHIFT));
 	cmd_dma_handle = h->cmd_pool_dhandle + index * sizeof(*c);
 	c->err_info = h->errinfo_pool + index;
@@ -5516,7 +5516,6 @@ static void hpsa_preinitialize_commands(struct ctlr_info *h)
 		struct CommandList *c = h->cmd_pool + i;
 
 		hpsa_cmd_init(h, i, c);
-		atomic_set(&c->refcount, 0);
 	}
 }
 
@@ -6107,19 +6106,12 @@ static struct CommandList *cmd_tagged_alloc(struct ctlr_info *h,
 		return NULL;
 	}
 
-	atomic_inc(&c->refcount);
-
 	hpsa_cmd_partial_init(h, idx, c);
 	return c;
 }
 
 static void cmd_tagged_free(struct ctlr_info *h, struct CommandList *c)
 {
-	/*
-	 * Release our reference to the block.  We don't need to do anything
-	 * else to free it, because it is accessed by index.
-	 */
-	(void)atomic_dec(&c->refcount);
 	c->scsi_cmd = NULL;
 }
 
diff --git a/drivers/scsi/hpsa_cmd.h b/drivers/scsi/hpsa_cmd.h
index 7825cbfea4dc..2575a396f1a5 100644
--- a/drivers/scsi/hpsa_cmd.h
+++ b/drivers/scsi/hpsa_cmd.h
@@ -449,7 +449,6 @@ struct CommandList {
 
 	int abort_pending;
 	struct hpsa_scsi_dev_t *device;
-	atomic_t refcount; /* Must be last to avoid memset in hpsa_cmd_init() */
 } __aligned(COMMANDLIST_ALIGNMENT);
 
 /* Max S/G elements in I/O accelerator command */
-- 
2.17.1