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[SCSI] use scatter lists for all block pc requests and simplify hw handlers

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Original From: Mike Christie <michaelc@cs.wisc.edu>

Add scsi_execute_req() as a replacement for scsi_wait_req()

Fixed up various pieces (added REQ_SPECIAL and caught req use after
free)

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley
2005-06-15 18:48:29 -05:00
parent 8e6401187e
commit 392160335c
3 changed files with 102 additions and 64 deletions
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51
drivers/scsi/scsi_lib.c
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@ -246,7 +246,7 @@ void scsi_wait_req(struct scsi_request *sreq, const void *cmnd, void *buffer,
unsigned bufflen, int timeout, int retries)
{
DECLARE_COMPLETION(wait);
int write = sreq->sr_data_direction == DMA_TO_DEVICE;
int write = (sreq->sr_data_direction == DMA_TO_DEVICE);
struct request *req;
req = blk_get_request(sreq->sr_device->request_queue, write,
@ -281,6 +281,55 @@ void scsi_wait_req(struct scsi_request *sreq, const void *cmnd, void *buffer,
EXPORT_SYMBOL(scsi_wait_req);
/**
* scsi_execute_req - insert request and wait for the result
* @sdev: scsi device
* @cmd: scsi command
* @data_direction: data direction
* @buffer: data buffer
* @bufflen: len of buffer
* @sense: optional sense buffer
* @timeout: request timeout in seconds
* @retries: number of times to retry request
*
* scsi_execute_req returns the req->errors value which is the
* the scsi_cmnd result field.
**/
int scsi_execute_req(struct scsi_device *sdev, unsigned char *cmd,
int data_direction, void *buffer, unsigned bufflen,
unsigned char *sense, int timeout, int retries)
{
struct request *req;
int write = (data_direction == DMA_TO_DEVICE);
int ret = DRIVER_ERROR << 24;
req = blk_get_request(sdev->request_queue, write, __GFP_WAIT);
if (bufflen && blk_rq_map_kern(sdev->request_queue, req,
buffer, bufflen, __GFP_WAIT))
goto out;
req->cmd_len = COMMAND_SIZE(cmd[0]);
memcpy(req->cmd, cmd, req->cmd_len);
req->sense = sense;
req->sense_len = 0;
req->timeout = timeout;
req->flags |= REQ_BLOCK_PC | REQ_SPECIAL;
/*
* head injection *required* here otherwise quiesce won't work
*/
blk_execute_rq(req->q, NULL, req, 1);
ret = req->errors;
out:
blk_put_request(req);
return ret;
}
EXPORT_SYMBOL(scsi_execute_req);
/*
* Function: scsi_init_cmd_errh()
*