linux-kernel - [PATCH] ata: acard-ahci: removeset but not used variable 'n

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Message-ID: <20191213031157.52115-1-yaohongbo@huawei.com>
Date:   Fri, 13 Dec 2019 11:11:57 +0800
From:   Hongbo Yao <yaohongbo@...wei.com>
To:     <axboe@...nel.dk>
CC:     <yaohongbo@...wei.com>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <linuxarm@...wei.com>
Subject: [PATCH] ata: acard-ahci: removeset but not used variable 'n_elem'

Fixes gcc '-Wunused-but-set-variable' warning:

drivers/ata/acard-ahci.c: In function acard_ahci_qc_prep:
drivers/ata/acard-ahci.c:268:15: warning: variable n_elem set but not
used [-Wunused-but-set-variable]

It is never used so can be removed. acard_ahci_fill_sg() is called only
in one place, use 'void' instead of 'int'.

Reported-by: Hulk Robot <hulkci@...wei.com>
Signed-off-by: Hongbo Yao <yaohongbo@...wei.com>
---
 drivers/ata/acard-ahci.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/ata/acard-ahci.c b/drivers/ata/acard-ahci.c
index 46dc54d18f0b..0613c1269292 100644
--- a/drivers/ata/acard-ahci.c
+++ b/drivers/ata/acard-ahci.c
@@ -179,7 +179,7 @@ static void acard_ahci_pci_print_info(struct ata_host *host)
 	ahci_print_info(host, scc_s);
 }
 
-static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
+static void acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 {
 	struct scatterlist *sg;
 	struct acard_sg *acard_sg = cmd_tbl + AHCI_CMD_TBL_HDR_SZ;
@@ -206,8 +206,6 @@ static unsigned int acard_ahci_fill_sg(struct ata_queued_cmd *qc, void *cmd_tbl)
 	}
 
 	acard_sg[last_si].size |= cpu_to_le32(1 << 31);	/* set EOT */
-
-	return si;
 }
 
 static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
@@ -218,7 +216,6 @@ static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
 	void *cmd_tbl;
 	u32 opts;
 	const u32 cmd_fis_len = 5; /* five dwords */
-	unsigned int n_elem;
 
 	/*
 	 * Fill in command table information.  First, the header,
@@ -232,9 +229,8 @@ static enum ata_completion_errors acard_ahci_qc_prep(struct ata_queued_cmd *qc)
 		memcpy(cmd_tbl + AHCI_CMD_TBL_CDB, qc->cdb, qc->dev->cdb_len);
 	}
 
-	n_elem = 0;
 	if (qc->flags & ATA_QCFLAG_DMAMAP)
-		n_elem = acard_ahci_fill_sg(qc, cmd_tbl);
+		acard_ahci_fill_sg(qc, cmd_tbl);
 
 	/*
 	 * Fill in command slot information.
-- 
2.20.1