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Petersen" , James Bottomley CC: , , "Bart Van Assche" , Hannes Reinecke Subject: [PATCH 20/31] scsi: Only add commands to the device command list if required by the LLD Date: Tue, 23 May 2017 17:34:09 -0700 Message-ID: <20170524003420.5381-21-bart.vanassche@sandisk.com> X-Mailer: git-send-email 2.12.2 In-Reply-To: <20170524003420.5381-1-bart.vanassche@sandisk.com> References: <20170524003420.5381-1-bart.vanassche@sandisk.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrOLMWRmVeSWpSXmKPExsXCddJ5ka7QVZVIg8MX1CwWvNnLZrGxn8Ni 7y1ti+7rO9gslh//x+TA6jFt0ik2j49Pb7F4rN9ylcXj8ya5AJYoLpuU1JzMstQifbsErozp nceYCvaqVTzdeJStgfG6QhcjB4eEgInE9kUyXYxcHEICS5kkVq1dy9zFyAnk7GCUOLypCqbm 1tkQiJqNjBJ3F0LUsAkYSXx7P5MFxBYRKJS4tK2DEaSIWWACo8S+Wx/ZQBLCAgkSk9YfYAex WQRUJR5NPQrWwCtgLzG57zOYLSEgL3F2y06woZxA8a5XE9hBFgsJ2Eks2l4BMlNCoI9V4tWF DWwQvYISJ2c+AetlFpCQOPjiBdTR6hInl8xnmsAoNAtJ2SwkZQsYmVYxiuVm5hTnpqcWGJrq FSfmpWQWZ+sl5+duYoQEd+YOxrtPvA8xCnAwKvHwJjioRAqxJpYVV+YeYpTgYFYS4V2+ASjE m5JYWZValB9fVJqTWnyIUZqDRUmc95zM1AghgfTEktTs1NSC1CKYLBMHp1QD46adCyctWb/O 9HvQm/QazbnuHIJLNktsNDJZXDhRdU5gzO/gV/dnBxYUv21rfS3oUvA9X4pn/vIVyoVRH5S5 e2MDpjsEpOnGGD9T9t7q+vV6nsmrORs/NHPnh6eH7fRcZnXVkv3LrfQOzV8LmU9k/T7LVPvz gK/JzjM9zA5+/o+D5BYVxgkJKrEUZyQaajEXFScCAMNQ8cFqAgAA X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrOJMWRmVeSWpSXmKPExsXCtZGTTZf/qkqkwZMPEhYHf7YxWix4s5fN YmM/h8XeW9oW3dd3sFksP/6PyYHNY9qkU2weH5/eYvGYtuY8k8f6LVdZPD5vkgtgjeKySUnN ySxLLdK3S+DKmN55jKlgr1rF041H2RoYryt0MXJwSAiYSNw6G9LFyMUhJLCeUeLd+Y+sXYyc HGwCRhLf3s9kAbFFBAol7p8+zQZSxCwwgVHi2N1PYEXCAgkSk9YfYAexWQRUJR5NPcoCMpRX wF6ib6c9SFhCQF7i7JadzCA2J1C469UEdpASIQE7iUXbKyYwci9gZFjFKJabmVOcm55ZYGik V5yYl5JZnK2XnJ+7iRESFFE7GK9PND/EyMTBKdXAaHHe7n+jrLBIK1NRmeM12UdSa5auWp17 ckbdKt3LZSfty6d8em0R/c7gWu28QyZClx/Efa9vbcj3uV25594upf45YfGLg9gstrhfLGL/ q6FzentJ/9dPf5/bz1uz+Tv7yoOCfzaU220/He3ZEbKtc5mLVN8P3sAiRqP626vZTBtd7Dbd Px9/QImlOCPRUIu5qDgRAJR4H1a6AQAA MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:63.163.107.21; 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20:bvbZvZszOvJJ/YXW9KSNAnBZC6rjBLMcutzk111afpgMd0sb0/6lhpHpezsdTINWrSl3t/cJaSdvfj7FkE69u5G7YsxI83WeAQtDRKUgDTz3fHHN+/FCQ5xycHAa0f9nV3V9gBYKslKTWTE7wftZalGvRRtvdoVcCDZtLKKfAOQ= X-OriginatorOrg: sandisk.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 May 2017 00:34:27.4850 (UTC) X-MS-Exchange-CrossTenant-Id: b61c8803-16f3-4c35-9b17-6f65f441df86 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=b61c8803-16f3-4c35-9b17-6f65f441df86; Ip=[63.163.107.21]; Helo=[milsmgep15.sandisk.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN6PR04MB0498 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Just like for the scsi-mq code path, in the single queue SCSI code path only add commands to the per-device command list if required by the SCSI LLD. This patch will make it easier to merge the single-queue and multiqueue command initialization code. Signed-off-by: Bart Van Assche Reviewed-by: Christoph Hellwig Cc: Hannes Reinecke Reviewed-by: Hannes Reinecke --- drivers/scsi/scsi.c | 9 +-------- drivers/scsi/scsi_lib.c | 52 +++++++++++++++++++++++++++++------------------- drivers/scsi/scsi_priv.h | 2 ++ 3 files changed, 35 insertions(+), 28 deletions(-) diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c index 7bfbcfa7af40..485684aafb9b 100644 --- a/drivers/scsi/scsi.c +++ b/drivers/scsi/scsi.c @@ -108,14 +108,7 @@ EXPORT_SYMBOL(scsi_sd_pm_domain); */ void scsi_put_command(struct scsi_cmnd *cmd) { - unsigned long flags; - - /* serious error if the command hasn't come from a device list */ - spin_lock_irqsave(&cmd->device->list_lock, flags); - BUG_ON(list_empty(&cmd->list)); - list_del_init(&cmd->list); - spin_unlock_irqrestore(&cmd->device->list_lock, flags); - + scsi_del_cmd_from_list(cmd); BUG_ON(delayed_work_pending(&cmd->abort_work)); } diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 31d2b9cd20e5..5e2f26524475 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -582,19 +582,9 @@ static void scsi_mq_free_sgtables(struct scsi_cmnd *cmd) static void scsi_mq_uninit_cmd(struct scsi_cmnd *cmd) { - struct scsi_device *sdev = cmd->device; - struct Scsi_Host *shost = sdev->host; - unsigned long flags; - scsi_mq_free_sgtables(cmd); scsi_uninit_cmd(cmd); - - if (shost->use_cmd_list) { - BUG_ON(list_empty(&cmd->list)); - spin_lock_irqsave(&sdev->list_lock, flags); - list_del_init(&cmd->list); - spin_unlock_irqrestore(&sdev->list_lock, flags); - } + scsi_del_cmd_from_list(cmd); } /* @@ -1132,6 +1122,35 @@ int scsi_init_io(struct scsi_cmnd *cmd) } EXPORT_SYMBOL(scsi_init_io); +/* Add a command to the list used by the aacraid and dpt_i2o drivers */ +void scsi_add_cmd_to_list(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdev = cmd->device; + struct Scsi_Host *shost = sdev->host; + unsigned long flags; + + if (shost->use_cmd_list) { + spin_lock_irqsave(&sdev->list_lock, flags); + list_add_tail(&cmd->list, &sdev->cmd_list); + spin_unlock_irqrestore(&sdev->list_lock, flags); + } +} + +/* Remove a command from the list used by the aacraid and dpt_i2o drivers */ +void scsi_del_cmd_from_list(struct scsi_cmnd *cmd) +{ + struct scsi_device *sdev = cmd->device; + struct Scsi_Host *shost = sdev->host; + unsigned long flags; + + if (shost->use_cmd_list) { + spin_lock_irqsave(&sdev->list_lock, flags); + BUG_ON(list_empty(&cmd->list)); + list_del_init(&cmd->list); + spin_unlock_irqrestore(&sdev->list_lock, flags); + } +} + /* Called from inside blk_get_request() */ static void scsi_initialize_rq(struct request *rq) { @@ -1145,7 +1164,6 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) { void *buf = cmd->sense_buffer; void *prot = cmd->prot_sdb; - unsigned long flags; /* zero out the cmd, except for the embedded scsi_request */ memset((char *)cmd + sizeof(cmd->req), 0, @@ -1157,9 +1175,7 @@ void scsi_init_command(struct scsi_device *dev, struct scsi_cmnd *cmd) INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); cmd->jiffies_at_alloc = jiffies; - spin_lock_irqsave(&dev->list_lock, flags); - list_add_tail(&cmd->list, &dev->cmd_list); - spin_unlock_irqrestore(&dev->list_lock, flags); + scsi_add_cmd_to_list(cmd); } static int scsi_setup_scsi_cmnd(struct scsi_device *sdev, struct request *req) @@ -1874,11 +1890,7 @@ static int scsi_mq_prep_fn(struct request *req) INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); cmd->jiffies_at_alloc = jiffies; - if (shost->use_cmd_list) { - spin_lock_irq(&sdev->list_lock); - list_add_tail(&cmd->list, &sdev->cmd_list); - spin_unlock_irq(&sdev->list_lock); - } + scsi_add_cmd_to_list(cmd); sg = (void *)cmd + sizeof(struct scsi_cmnd) + shost->hostt->cmd_size; cmd->sdb.table.sgl = sg; diff --git a/drivers/scsi/scsi_priv.h b/drivers/scsi/scsi_priv.h index f86057842f9a..c11c1f9c912c 100644 --- a/drivers/scsi/scsi_priv.h +++ b/drivers/scsi/scsi_priv.h @@ -80,6 +80,8 @@ int scsi_eh_get_sense(struct list_head *work_q, int scsi_noretry_cmd(struct scsi_cmnd *scmd); /* scsi_lib.c */ +extern void scsi_add_cmd_to_list(struct scsi_cmnd *cmd); +extern void scsi_del_cmd_from_list(struct scsi_cmnd *cmd); extern int scsi_maybe_unblock_host(struct scsi_device *sdev); extern void scsi_device_unbusy(struct scsi_device *sdev); extern void scsi_queue_insert(struct scsi_cmnd *cmd, int reason);