From: Damien Le Moal <damien.lemoal@wdc.com>
To: Jens Axboe <axboe@kernel.dk>, linux-ide@vger.kernel.org
Cc: linux-block@vger.kernel.org
Subject: [PATCH v6 3/9] libata: simplify ata_scsi_rbuf_fill()
Date: Thu, 12 Aug 2021 11:43:57 +0900 [thread overview]
Message-ID: <20210812024403.765819-4-damien.lemoal@wdc.com> (raw)
In-Reply-To: <20210812024403.765819-1-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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
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
next prev parent reply other threads:[~2021-08-12 2:44 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-12 2:43 [PATCH v6 0/9] libata cleanups and improvements Damien Le Moal
2021-08-12 2:43 ` [PATCH v6 1/9] libata: fix ata_host_alloc_pinfo() Damien Le Moal
2021-08-12 2:43 ` [PATCH v6 2/9] libata: fix ata_host_start() Damien Le Moal
2021-08-12 2:43 ` Damien Le Moal [this message]
2021-08-12 2:43 ` [PATCH v6 4/9] libata: cleanup device sleep capability detection Damien Le Moal
2021-08-12 2:43 ` [PATCH v6 5/9] libata: cleanup ata_dev_configure() Damien Le Moal
2021-08-12 2:44 ` [PATCH v6 6/9] libata: cleanup NCQ priority handling Damien Le Moal
2021-08-12 2:44 ` [PATCH v6 7/9] libata: fix ata_read_log_page() warning Damien Le Moal
2021-08-12 2:44 ` [PATCH v6 8/9] libata: print feature list on device scan Damien Le Moal
2021-08-12 2:44 ` [PATCH v6 9/9] libata: Introduce ncq_prio_supported sysfs sttribute Damien Le Moal
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