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[SCSI] use one-element sg list in scsi_send_eh_cmnd 

scsi_send_eh_cmnd is the last user of non-sg commands currently.
This patch switches it to a one-element SG list.  Also updates the
kerneldoc comment for scsi_send_eh_cmnd to reflect reality while we're
at it.

Test on my mptsas card, but this should get testing with as many
drivers as possible.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Christoph Hellwig 2006-11-04 20:04:21 +01:00 committed by James Bottomley
parent fe4a36cf65
commit 2dc611de5a
1 changed files with 24 additions and 9 deletions
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33
drivers/scsi/scsi_error.c
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@ -453,9 +453,18 @@ static void scsi_eh_done(struct scsi_cmnd *scmd)
}
/**
* scsi_send_eh_cmnd - send a cmd to a device as part of error recovery.
* @scmd: SCSI Cmd to send.
* @timeout: Timeout for cmd.
* scsi_send_eh_cmnd - submit a scsi command as part of error recory
* @scmd: SCSI command structure to hijack
* @cmnd: CDB to send
* @cmnd_size: size in bytes of @cmnd
* @timeout: timeout for this request
* @copy_sense: request sense data if set to 1
*
* This function is used to send a scsi command down to a target device
* as part of the error recovery process. If @copy_sense is 0 the command
* sent must be one that does not transfer any data. If @copy_sense is 1
* the command must be REQUEST_SENSE and this functions copies out the
* sense buffer it got into @scmd->sense_buffer.
*
* Return value:
* SUCCESS or FAILED or NEEDS_RETRY
@ -469,6 +478,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
DECLARE_COMPLETION_ONSTACK(done);
unsigned long timeleft;
unsigned long flags;
struct scatterlist sgl;
unsigned char old_cmnd[MAX_COMMAND_SIZE];
enum dma_data_direction old_data_direction;
unsigned short old_use_sg;
@ -500,19 +510,24 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
if (shost->hostt->unchecked_isa_dma)
gfp_mask |= __GFP_DMA;
scmd->sc_data_direction = DMA_FROM_DEVICE;
scmd->request_bufflen = 252;
scmd->request_buffer = kzalloc(scmd->request_bufflen, gfp_mask);
if (!scmd->request_buffer)
sgl.page = alloc_page(gfp_mask);
if (!sgl.page)
return FAILED;
sgl.offset = 0;
sgl.length = 252;
scmd->sc_data_direction = DMA_FROM_DEVICE;
scmd->request_bufflen = sgl.length;
scmd->request_buffer = &sgl;
scmd->use_sg = 1;
} else {
scmd->request_buffer = NULL;
scmd->request_bufflen = 0;
scmd->sc_data_direction = DMA_NONE;
scmd->use_sg = 0;
}
scmd->underflow = 0;
scmd->use_sg = 0;
scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]);
if (sdev->scsi_level <= SCSI_2)
@ -583,7 +598,7 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
memcpy(scmd->sense_buffer, scmd->request_buffer,
sizeof(scmd->sense_buffer));
}
kfree(scmd->request_buffer);
__free_page(sgl.page);
}