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authorChristoph Hellwig <hch@lst.de>2006-11-04 20:04:21 +0100
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-11-15 12:55:52 -0600
commit2dc611de5a3fd955cd0298c50691d4c05046db97 (patch)
treed3d1e28c508d12cbf7bba95cea39cad6f8745a1b /drivers/scsi/scsi_error.c
parentfe4a36cf652031d2744a536ba5121032840380cb (diff)
[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>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
-rw-r--r--drivers/scsi/scsi_error.c33
1 files changed, 24 insertions, 9 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index aff1b0cfd4b2..2ecb6ff42444 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -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);
}