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From: Damien Le Moal <damien.lemoal@wdc.com>
To: Jens Axboe <axboe@kernel.dk>,
	linux-block@vger.kernel.org, linux-ide@vger.kernel.org,
	"Martin K . Petersen" <martin.petersen@oracle.com>,
	linux-scsi@vger.kernel.org
Cc: Sathya Prakash <sathya.prakash@broadcom.com>,
	Sreekanth Reddy <sreekanth.reddy@broadcom.com>,
	Suganath Prabu Subramani  <suganath-prabu.subramani@broadcom.com>
Subject: [PATCH v4 03/10] libata: fix sparse warning
Date: Sat,  7 Aug 2021 13:18:52 +0900	[thread overview]
Message-ID: <20210807041859.579409-4-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20210807041859.579409-1-damien.lemoal@wdc.com>

Sparse complains about context imbalance in ata_scsi_rbuf_get() and
ata_scsi_rbuf_put() due to these functions respectively only taking
and releasing the ata_scsi_rbuf_lock spinlock. Since these functions are
only called from ata_scsi_rbuf_fill() with ata_scsi_rbuf_get() being
called with a copy_in argument always false, the code can be simplified
and ata_scsi_rbuf_{get|put} removed. This change both simplifies the
code and fixes the sparse warning.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
---
 drivers/ata/libata-scsi.c | 60 ++++++---------------------------------
 1 file changed, 9 insertions(+), 51 deletions(-)

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index b9588c52815d..0b7b4624e4df 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -1765,53 +1765,6 @@ struct ata_scsi_args {
 	struct scsi_cmnd	*cmd;
 };
 
-/**
- *	ata_scsi_rbuf_get - Map response buffer.
- *	@cmd: SCSI command containing buffer to be mapped.
- *	@flags: unsigned long variable to store irq enable status
- *	@copy_in: copy in from user buffer
- *
- *	Prepare buffer for simulated SCSI commands.
- *
- *	LOCKING:
- *	spin_lock_irqsave(ata_scsi_rbuf_lock) on success
- *
- *	RETURNS:
- *	Pointer to response buffer.
- */
-static void *ata_scsi_rbuf_get(struct scsi_cmnd *cmd, bool copy_in,
-			       unsigned long *flags)
-{
-	spin_lock_irqsave(&ata_scsi_rbuf_lock, *flags);
-
-	memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
-	if (copy_in)
-		sg_copy_to_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
-				  ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
-	return ata_scsi_rbuf;
-}
-
-/**
- *	ata_scsi_rbuf_put - Unmap response buffer.
- *	@cmd: SCSI command containing buffer to be unmapped.
- *	@copy_out: copy out result
- *	@flags: @flags passed to ata_scsi_rbuf_get()
- *
- *	Returns rbuf buffer.  The result is copied to @cmd's buffer if
- *	@copy_back is true.
- *
- *	LOCKING:
- *	Unlocks ata_scsi_rbuf_lock.
- */
-static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
-				     unsigned long *flags)
-{
-	if (copy_out)
-		sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
-				    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
-	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, *flags);
-}
-
 /**
  *	ata_scsi_rbuf_fill - wrapper for SCSI command simulators
  *	@args: device IDENTIFY data / SCSI command of interest.
@@ -1830,14 +1783,19 @@ static inline void ata_scsi_rbuf_put(struct scsi_cmnd *cmd, bool copy_out,
 static void ata_scsi_rbuf_fill(struct ata_scsi_args *args,
 		unsigned int (*actor)(struct ata_scsi_args *args, u8 *rbuf))
 {
-	u8 *rbuf;
 	unsigned int rc;
 	struct scsi_cmnd *cmd = args->cmd;
 	unsigned long flags;
 
-	rbuf = ata_scsi_rbuf_get(cmd, false, &flags);
-	rc = actor(args, rbuf);
-	ata_scsi_rbuf_put(cmd, rc == 0, &flags);
+	spin_lock_irqsave(&ata_scsi_rbuf_lock, flags);
+
+	memset(ata_scsi_rbuf, 0, ATA_SCSI_RBUF_SIZE);
+	rc = actor(args, ata_scsi_rbuf);
+	if (rc == 0)
+		sg_copy_from_buffer(scsi_sglist(cmd), scsi_sg_count(cmd),
+				    ata_scsi_rbuf, ATA_SCSI_RBUF_SIZE);
+
+	spin_unlock_irqrestore(&ata_scsi_rbuf_lock, flags);
 
 	if (rc == 0)
 		cmd->result = SAM_STAT_GOOD;
-- 
2.31.1


  parent reply	other threads:[~2021-08-07  4:19 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-07  4:18 [PATCH v4 00/10] libata cleanups and improvements Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 01/10] libata: fix ata_host_alloc_pinfo() Damien Le Moal
2021-08-09  6:09   ` Hannes Reinecke
2021-08-09  9:07     ` Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 02/10] libata: fix ata_host_start() Damien Le Moal
2021-08-07  4:18 ` Damien Le Moal [this message]
2021-08-09  6:10   ` [PATCH v4 03/10] libata: fix sparse warning Hannes Reinecke
2021-08-07  4:18 ` [PATCH v4 04/10] libata: cleanup device sleep capability detection Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 05/10] libata: cleanup ata_dev_configure() Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 06/10] libata: cleanup NCQ priority handling Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 07/10] libata: fix ata_read_log_page() warning Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 08/10] libata: print feature list on device scan Damien Le Moal
2021-08-07  4:18 ` [PATCH v4 09/10] libahci: Introduce ncq_prio_supported sysfs sttribute Damien Le Moal
2021-08-09  6:11   ` Hannes Reinecke
2021-08-07  4:18 ` [PATCH v4 10/10] scsi: mpt3sas: Introduce sas_ncq_prio_supported " Damien Le Moal
2021-08-10  3:12   ` Martin K. Petersen

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