[libata] avoid needlessly passing around ptr to SCSI completion func

It's stored in struct scsi_cmnd->scsi_done, making several 'done'
parameters to functions redundant.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>

4 files changed, 29 insertions, 42 deletions

diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c
index 66aa4bee80a6..5defc74973d7 100644
--- a/drivers/ata/libata-scsi.c
+++ b/drivers/ata/libata-scsi.c
@@ -346,12 +346,11 @@ struct device_attribute *ata_common_sdev_attrs[] = {
 };
 EXPORT_SYMBOL_GPL(ata_common_sdev_attrs);
 
-static void ata_scsi_invalid_field(struct scsi_cmnd *cmd,
-                                   void (*done)(struct scsi_cmnd *))
+static void ata_scsi_invalid_field(struct scsi_cmnd *cmd)
 {
         ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x24, 0x0);
         /* "Invalid field in cbd" */
-        done(cmd);
+        cmd->scsi_done(cmd);
 }
 
 /**
@@ -719,7 +718,6 @@ EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
  *      ata_scsi_qc_new - acquire new ata_queued_cmd reference
  *      @dev: ATA device to which the new command is attached
  *      @cmd: SCSI command that originated this ATA command
- *      @done: SCSI command completion function
  *
  *      Obtain a reference to an unused ata_queued_cmd structure,
  *      which is the basic libata structure representing a single
@@ -736,21 +734,20 @@ EXPORT_SYMBOL_GPL(ata_scsi_ioctl);
  *      Command allocated, or %NULL if none available.
  */
 static struct ata_queued_cmd *ata_scsi_qc_new(struct ata_device *dev,
-                                              struct scsi_cmnd *cmd,
-                                              void (*done)(struct scsi_cmnd *))
+                                              struct scsi_cmnd *cmd)
 {
         struct ata_queued_cmd *qc;
 
         qc = ata_qc_new_init(dev);
         if (qc) {
                 qc->scsicmd = cmd;
-                qc->scsidone = done;
+                qc->scsidone = cmd->scsi_done;
 
                 qc->sg = scsi_sglist(cmd);
                 qc->n_elem = scsi_sg_count(cmd);
         } else {
                 cmd->result = (DID_OK << 16) | (QUEUE_FULL << 1);
-                done(cmd);
+                cmd->scsi_done(cmd);
         }
 
         return qc;
@@ -1735,7 +1732,6 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
  *      ata_scsi_translate - Translate then issue SCSI command to ATA device
  *      @dev: ATA device to which the command is addressed
  *      @cmd: SCSI command to execute
- *      @done: SCSI command completion function
  *      @xlat_func: Actor which translates @cmd to an ATA taskfile
  *
  *      Our ->queuecommand() function has decided that the SCSI
@@ -1759,7 +1755,6 @@ static void ata_scsi_qc_complete(struct ata_queued_cmd *qc)
  *      needs to be deferred.
  */
 static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
-                              void (*done)(struct scsi_cmnd *),
                               ata_xlat_func_t xlat_func)
 {
         struct ata_port *ap = dev->link->ap;
@@ -1768,7 +1763,7 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
 
         VPRINTK("ENTER\n");
 
-        qc = ata_scsi_qc_new(dev, cmd, done);
+        qc = ata_scsi_qc_new(dev, cmd);
         if (!qc)
                 goto err_mem;
 
@@ -1804,14 +1799,14 @@ static int ata_scsi_translate(struct ata_device *dev, struct scsi_cmnd *cmd,
 
 early_finish:
         ata_qc_free(qc);
-        qc->scsidone(cmd);
+        cmd->scsi_done(cmd);
         DPRINTK("EXIT - early finish (good or error)\n");
         return 0;
 
 err_did:
         ata_qc_free(qc);
         cmd->result = (DID_ERROR << 16);
-        qc->scsidone(cmd);
+        cmd->scsi_done(cmd);
 err_mem:
         DPRINTK("EXIT - internal\n");
         return 0;
@@ -3116,7 +3111,6 @@ static inline void ata_scsi_dump_cdb(struct ata_port *ap,
 }
 
 static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
-                                      void (*done)(struct scsi_cmnd *),
                                       struct ata_device *dev)
 {
         u8 scsi_op = scmd->cmnd[0];
@@ -3150,9 +3144,9 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
         }
 
         if (xlat_func)
-                rc = ata_scsi_translate(dev, scmd, done, xlat_func);
+                rc = ata_scsi_translate(dev, scmd, xlat_func);
         else
-                ata_scsi_simulate(dev, scmd, done);
+                ata_scsi_simulate(dev, scmd);
 
         return rc;
 
@@ -3160,7 +3154,7 @@ static inline int __ata_scsi_queuecmd(struct scsi_cmnd *scmd,
         DPRINTK("bad CDB len=%u, scsi_op=0x%02x, max=%u\n",
                 scmd->cmd_len, scsi_op, dev->cdb_len);
         scmd->result = DID_ERROR << 16;
-        done(scmd);
+        scmd->scsi_done(scmd);
         return 0;
 }
 
@@ -3199,7 +3193,7 @@ int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
 
         dev = ata_scsi_find_dev(ap, scsidev);
         if (likely(dev))
-                rc = __ata_scsi_queuecmd(cmd, cmd->scsi_done, dev);
+                rc = __ata_scsi_queuecmd(cmd, dev);
         else {
                 cmd->result = (DID_BAD_TARGET << 16);
                 cmd->scsi_done(cmd);
@@ -3214,7 +3208,6 @@ int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
  *      ata_scsi_simulate - simulate SCSI command on ATA device
  *      @dev: the target device
  *      @cmd: SCSI command being sent to device.
- *      @done: SCSI command completion function.
  *
  *      Interprets and directly executes a select list of SCSI commands
  *      that can be handled internally.
@@ -3223,8 +3216,7 @@ int ata_scsi_queuecmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd)
  *      spin_lock_irqsave(host lock)
  */
 
-void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
-                      void (*done)(struct scsi_cmnd *))
+void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd)
 {
         struct ata_scsi_args args;
         const u8 *scsicmd = cmd->cmnd;
@@ -3233,17 +3225,17 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
         args.dev = dev;
         args.id = dev->id;
         args.cmd = cmd;
-        args.done = done;
+        args.done = cmd->scsi_done;
 
         switch(scsicmd[0]) {
         /* TODO: worth improving? */
         case FORMAT_UNIT:
-                ata_scsi_invalid_field(cmd, done);
+                ata_scsi_invalid_field(cmd);
                 break;
 
         case INQUIRY:
                 if (scsicmd[1] & 2)                /* is CmdDt set?  */
-                        ata_scsi_invalid_field(cmd, done);
+                        ata_scsi_invalid_field(cmd);
                 else if ((scsicmd[1] & 1) == 0)    /* is EVPD clear? */
                         ata_scsi_rbuf_fill(&args, ata_scsiop_inq_std);
                 else switch (scsicmd[2]) {
@@ -3269,7 +3261,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                         ata_scsi_rbuf_fill(&args, ata_scsiop_inq_b2);
                         break;
                 default:
-                        ata_scsi_invalid_field(cmd, done);
+                        ata_scsi_invalid_field(cmd);
                         break;
                 }
                 break;
@@ -3281,7 +3273,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
 
         case MODE_SELECT:       /* unconditionally return */
         case MODE_SELECT_10:    /* bad-field-in-cdb */
-                ata_scsi_invalid_field(cmd, done);
+                ata_scsi_invalid_field(cmd);
                 break;
 
         case READ_CAPACITY:
@@ -3292,7 +3284,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                 if ((scsicmd[1] & 0x1f) == SAI_READ_CAPACITY_16)
                         ata_scsi_rbuf_fill(&args, ata_scsiop_read_cap);
                 else
-                        ata_scsi_invalid_field(cmd, done);
+                        ata_scsi_invalid_field(cmd);
                 break;
 
         case REPORT_LUNS:
@@ -3302,7 +3294,7 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
         case REQUEST_SENSE:
                 ata_scsi_set_sense(cmd, 0, 0, 0);
                 cmd->result = (DRIVER_SENSE << 24);
-                done(cmd);
+                cmd->scsi_done(cmd);
                 break;
 
         /* if we reach this, then writeback caching is disabled,
@@ -3324,14 +3316,14 @@ void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
                 if ((tmp8 == 0x4) && (!scsicmd[3]) && (!scsicmd[4]))
                         ata_scsi_rbuf_fill(&args, ata_scsiop_noop);
                 else
-                        ata_scsi_invalid_field(cmd, done);
+                        ata_scsi_invalid_field(cmd);
                 break;
 
         /* all other commands */
         default:
                 ata_scsi_set_sense(cmd, ILLEGAL_REQUEST, 0x20, 0x0);
                 /* "Invalid command operation code" */
-                done(cmd);
+                cmd->scsi_done(cmd);
                 break;
         }
 }
@@ -3858,7 +3850,6 @@ EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
 /**
  *      ata_sas_queuecmd - Issue SCSI cdb to libata-managed device
  *      @cmd: SCSI command to be sent
- *      @done: Completion function, called when command is complete
  *      @ap:    ATA port to which the command is being sent
  *
  *      RETURNS:
@@ -3866,18 +3857,17 @@ EXPORT_SYMBOL_GPL(ata_sas_slave_configure);
  *      0 otherwise.
  */
 
-int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
-                     struct ata_port *ap)
+int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap)
 {
         int rc = 0;
 
         ata_scsi_dump_cdb(ap, cmd);
 
         if (likely(ata_dev_enabled(ap->link.device)))
-                rc = __ata_scsi_queuecmd(cmd, done, ap->link.device);
+                rc = __ata_scsi_queuecmd(cmd, ap->link.device);
         else {
                 cmd->result = (DID_BAD_TARGET << 16);
-                done(cmd);
+                cmd->scsi_done(cmd);
         }
         return rc;
 }
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index 5bbaee597e88..2c71927aad64 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -5743,7 +5743,7 @@ static int ipr_queuecommand_lck(struct scsi_cmnd *scsi_cmd,
         }
 
         if (ipr_is_gata(res) && res->sata_port)
-                return ata_sas_queuecmd(scsi_cmd, done, res->sata_port->ap);
+                return ata_sas_queuecmd(scsi_cmd, res->sata_port->ap);
 
         ipr_cmd = ipr_get_free_ipr_cmnd(ioa_cfg);
         ioarcb = &ipr_cmd->ioarcb;
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 29251fabecc6..5815cbeb27a6 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -211,8 +211,7 @@ static int sas_queuecommand_lck(struct scsi_cmnd *cmd,
                         unsigned long flags;
 
                         spin_lock_irqsave(dev->sata_dev.ap->lock, flags);
-                        res = ata_sas_queuecmd(cmd, scsi_done,
-                                               dev->sata_dev.ap);
+                        res = ata_sas_queuecmd(cmd, dev->sata_dev.ap);
                         spin_unlock_irqrestore(dev->sata_dev.ap->lock, flags);
                         goto out;
                 }
diff --git a/include/linux/libata.h b/include/linux/libata.h
index d947b1231662..c9c5d7ad1a2b 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -996,8 +996,7 @@ extern int ata_sas_port_init(struct ata_port *);
 extern int ata_sas_port_start(struct ata_port *ap);
 extern void ata_sas_port_stop(struct ata_port *ap);
 extern int ata_sas_slave_configure(struct scsi_device *, struct ata_port *);
-extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *),
-                            struct ata_port *ap);
+extern int ata_sas_queuecmd(struct scsi_cmnd *cmd, struct ata_port *ap);
 extern int sata_scr_valid(struct ata_link *link);
 extern int sata_scr_read(struct ata_link *link, int reg, u32 *val);
 extern int sata_scr_write(struct ata_link *link, int reg, u32 val);
@@ -1040,8 +1039,7 @@ extern unsigned int ata_do_dev_read_id(struct ata_device *dev,
                                         struct ata_taskfile *tf, u16 *id);
 extern void ata_qc_complete(struct ata_queued_cmd *qc);
 extern int ata_qc_complete_multiple(struct ata_port *ap, u32 qc_active);
-extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd,
-                              void (*done)(struct scsi_cmnd *));
+extern void ata_scsi_simulate(struct ata_device *dev, struct scsi_cmnd *cmd);
 extern int ata_std_bios_param(struct scsi_device *sdev,
                               struct block_device *bdev,
                               sector_t capacity, int geom[]);