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| author | Christoph Hellwig <hch@lst.de> | 2020-10-05 10:41:28 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-10-08 03:48:27 +0200 |
| commit | 7007e9dd56767a95de0947b3f7599bcc2f21687f (patch) | |
| tree | 2a3419a1303859aaadab9c3d22fa762bdc362332 /drivers/scsi/scsi_lib.c | |
| parent | scsi: core: Rename scsi_mq_prep_fn() to scsi_prepare_cmd() (diff) | |
| download | linux-7007e9dd56767a95de0947b3f7599bcc2f21687f.tar.xz linux-7007e9dd56767a95de0947b3f7599bcc2f21687f.zip | |
scsi: core: Clean up allocation and freeing of sgtables
Rename scsi_init_io() to scsi_alloc_sgtables(), and ensure callers call
scsi_free_sgtables() to cleanup failures close to scsi_init_io() instead of
leaking it down the generic I/O submission path.
Link: https://lore.kernel.org/r/20201005084130.143273-9-hch@lst.de
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 22 |
1 files changed, 8 insertions, 14 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index a6419e45b50f..55a1a060cd11 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -515,7 +515,7 @@ static void scsi_uninit_cmd(struct scsi_cmnd *cmd) } } -static void scsi_free_sgtables(struct scsi_cmnd *cmd) +void scsi_free_sgtables(struct scsi_cmnd *cmd) { if (cmd->sdb.table.nents) sg_free_table_chained(&cmd->sdb.table, @@ -524,6 +524,7 @@ static void scsi_free_sgtables(struct scsi_cmnd *cmd) sg_free_table_chained(&cmd->prot_sdb->table, SCSI_INLINE_PROT_SG_CNT); } +EXPORT_SYMBOL_GPL(scsi_free_sgtables); static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd) { @@ -983,7 +984,7 @@ static inline bool scsi_cmd_needs_dma_drain(struct scsi_device *sdev, } /** - * scsi_init_io - SCSI I/O initialization function. + * scsi_alloc_sgtables - allocate S/G tables for a command * @cmd: command descriptor we wish to initialize * * Returns: @@ -991,7 +992,7 @@ static inline bool scsi_cmd_needs_dma_drain(struct scsi_device *sdev, * * BLK_STS_RESOURCE - if the failure is retryable * * BLK_STS_IOERR - if the failure is fatal */ -blk_status_t scsi_init_io(struct scsi_cmnd *cmd) +blk_status_t scsi_alloc_sgtables(struct scsi_cmnd *cmd) { struct scsi_device *sdev = cmd->device; struct request *rq = cmd->request; @@ -1083,7 +1084,7 @@ out_free_sgtables: scsi_free_sgtables(cmd); return ret; } -EXPORT_SYMBOL(scsi_init_io); +EXPORT_SYMBOL(scsi_alloc_sgtables); /** * scsi_initialize_rq - initialize struct scsi_cmnd partially @@ -1171,7 +1172,7 @@ static blk_status_t scsi_setup_scsi_cmnd(struct scsi_device *sdev, * submit a request without an attached bio. */ if (req->bio) { - blk_status_t ret = scsi_init_io(cmd); + blk_status_t ret = scsi_alloc_sgtables(cmd); if (unlikely(ret != BLK_STS_OK)) return ret; } else { @@ -1213,19 +1214,12 @@ static blk_status_t scsi_setup_cmnd(struct scsi_device *sdev, struct request *req) { struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req); - blk_status_t ret; cmd->sc_data_direction = rq_dma_dir(req); if (blk_rq_is_scsi(req)) - ret = scsi_setup_scsi_cmnd(sdev, req); - else - ret = scsi_setup_fs_cmnd(sdev, req); - - if (ret != BLK_STS_OK) - scsi_free_sgtables(cmd); - - return ret; + return scsi_setup_scsi_cmnd(sdev, req); + return scsi_setup_fs_cmnd(sdev, req); } static blk_status_t |