Commit 6f5391c2 authored by Matthew Wilcox's avatar Matthew Wilcox Committed by James Bottomley
Browse files

[SCSI] Get rid of scsi_cmnd->done 



The ULD ->done callback moves into the scsi_driver.  By moving the call
to scsi_io_completion() from scsi_blk_pc_done() to scsi_finish_command(),
we can eliminate the latter entirely.  By returning 'good_bytes' from
the ->done callback (rather than invoking scsi_io_completion()), we can
stop exporting scsi_io_completion().

Also move the prototypes from sd.h to sd.c as they're all internal anyway.
Rename sd_rw_intr to sd_done and rw_intr to sr_done.

Inspired-by: default avatarChristoph Hellwig <hch@infradead.org>
Signed-off-by: default avatarMatthew Wilcox <willy@linux.intel.com>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@SteelEye.com>
parent 687d2bc4

drivers/scsi/scsi.c

+17 −3
Original line number Diff line number Diff line
@@ -59,6 +59,7 @@ 
#include <scsi/scsi_cmnd.h>

#include <scsi/scsi_dbg.h>

#include <scsi/scsi_device.h>

#include <scsi/scsi_driver.h>

#include <scsi/scsi_eh.h>

#include <scsi/scsi_host.h>

#include <scsi/scsi_tcq.h>
@@ -367,9 +368,8 @@ void scsi_log_send(struct scsi_cmnd *cmd) 
			scsi_print_command(cmd);

			if (level > 3) {

				printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"

				       " done = 0x%p, queuecommand 0x%p\n",

				       " queuecommand 0x%p\n",

					scsi_sglist(cmd), scsi_bufflen(cmd),

					cmd->done,

					cmd->device->host->hostt->queuecommand);



			}
@@ -654,6 +654,12 @@ void __scsi_done(struct scsi_cmnd *cmd) 
	blk_complete_request(rq);

}



/* Move this to a header if it becomes more generally useful */

static struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)

{

	return *(struct scsi_driver **)cmd->request->rq_disk->private_data;

}



/*

 * Function:    scsi_finish_command

 *
@@ -665,6 +671,8 @@ void scsi_finish_command(struct scsi_cmnd *cmd) 
{

	struct scsi_device *sdev = cmd->device;

	struct Scsi_Host *shost = sdev->host;

	struct scsi_driver *drv;

	unsigned int good_bytes;



	scsi_device_unbusy(sdev);
@@ -690,7 +698,13 @@ void scsi_finish_command(struct scsi_cmnd *cmd) 
				"Notifying upper driver of completion "

				"(result %x)\n", cmd->result));



	cmd->done(cmd);

	good_bytes = cmd->request_bufflen;

        if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {

		drv = scsi_cmd_to_driver(cmd);

		if (drv->done)

			good_bytes = drv->done(cmd);

	}

	scsi_io_completion(cmd, good_bytes);

}

EXPORT_SYMBOL(scsi_finish_command);

drivers/scsi/scsi_error.c

+0 −1
Original line number Diff line number Diff line
@@ -1671,7 +1671,6 @@ scsi_reset_provider(struct scsi_device *dev, int flag) 
	memset(&scmd->cmnd, '\0', sizeof(scmd->cmnd));

    

	scmd->scsi_done		= scsi_reset_provider_done_command;

	scmd->done			= NULL;

	scmd->request_buffer		= NULL;

	scmd->request_bufflen		= 0;

drivers/scsi/scsi_lib.c

+0 −14
Original line number Diff line number Diff line
@@ -982,7 +982,6 @@ void scsi_io_completion(struct scsi_cmnd *cmd, unsigned int good_bytes) 
	}

	scsi_end_request(cmd, 0, this_count, !result);

}

EXPORT_SYMBOL(scsi_io_completion);



/*

 * Function:    scsi_init_io()
@@ -1063,18 +1062,6 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev, 
	return cmd;

}



static void scsi_blk_pc_done(struct scsi_cmnd *cmd)

{

	BUG_ON(!blk_pc_request(cmd->request));

	/*

	 * This will complete the whole command with uptodate=1 so

	 * as far as the block layer is concerned the command completed

	 * successfully. Since this is a REQ_BLOCK_PC command the

	 * caller should check the request's errors value

	 */

	scsi_io_completion(cmd, cmd->request_bufflen);

}



int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)

{

	struct scsi_cmnd *cmd;
@@ -1124,7 +1111,6 @@ int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req) 
	cmd->transfersize = req->data_len;

	cmd->allowed = req->retries;

	cmd->timeout_per_command = req->timeout;

	cmd->done = scsi_blk_pc_done;

	return BLKPREP_OK;

}

EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);

drivers/scsi/scsi_priv.h

+1 −0
Original line number Diff line number Diff line
@@ -68,6 +68,7 @@ extern int scsi_maybe_unblock_host(struct scsi_device *sdev); 
extern void scsi_device_unbusy(struct scsi_device *sdev);

extern int scsi_queue_insert(struct scsi_cmnd *cmd, int reason);

extern void scsi_next_command(struct scsi_cmnd *cmd);

extern void scsi_io_completion(struct scsi_cmnd *, unsigned int);

extern void scsi_run_host_queues(struct Scsi_Host *shost);

extern struct request_queue *scsi_alloc_queue(struct scsi_device *sdev);

extern void scsi_free_queue(struct request_queue *q);

drivers/scsi/sd.c

+18 −10
Original line number Diff line number Diff line
@@ -86,6 +86,19 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); 
MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);

MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);



static int  sd_revalidate_disk(struct gendisk *);

static int  sd_probe(struct device *);

static int  sd_remove(struct device *);

static void sd_shutdown(struct device *);

static int sd_suspend(struct device *, pm_message_t state);

static int sd_resume(struct device *);

static void sd_rescan(struct device *);

static int sd_done(struct scsi_cmnd *);

static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);

static void scsi_disk_release(struct class_device *cdev);

static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);

static void sd_print_result(struct scsi_disk *, int);



static DEFINE_IDR(sd_index_idr);

static DEFINE_SPINLOCK(sd_index_lock);
@@ -240,6 +253,7 @@ static struct scsi_driver sd_template = { 
		.shutdown	= sd_shutdown,

	},

	.rescan			= sd_rescan,

	.done			= sd_done,

};



/*
@@ -508,12 +522,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq) 
	SCpnt->allowed = SD_MAX_RETRIES;

	SCpnt->timeout_per_command = timeout;



	/*

	 * This is the completion routine we use.  This is matched in terms

	 * of capability to this function.

	 */

	SCpnt->done = sd_rw_intr;



	/*

	 * This indicates that the command is ready from our end to be

	 * queued.
@@ -908,13 +916,13 @@ static struct block_device_operations sd_fops = { 
};



/**

 *	sd_rw_intr - bottom half handler: called when the lower level

 *	sd_done - bottom half handler: called when the lower level

 *	driver has completed (successfully or otherwise) a scsi command.

 *	@SCpnt: mid-level's per command structure.

 *

 *	Note: potentially run from within an ISR. Must not block.

 **/

static void sd_rw_intr(struct scsi_cmnd * SCpnt)

static int sd_done(struct scsi_cmnd *SCpnt)

{

	int result = SCpnt->result;

 	unsigned int xfer_size = SCpnt->request_bufflen;
@@ -935,7 +943,7 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt) 
	SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));

	if (sense_valid) {

		SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,

						   "sd_rw_intr: sb[respc,sk,asc,"

						   "sd_done: sb[respc,sk,asc,"

						   "ascq]=%x,%x,%x,%x\n",

						   sshdr.response_code,

						   sshdr.sense_key, sshdr.asc,
@@ -1007,7 +1015,7 @@ static void sd_rw_intr(struct scsi_cmnd * SCpnt) 
		break;

	}

 out:

	scsi_io_completion(SCpnt, good_bytes);

	return good_bytes;

}



static int media_not_present(struct scsi_disk *sdkp,

CRA Git | Maintained and supported by SUSTech CRA and CCSE