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OpenCloudOS-Kernel
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[SCSI] scsi_error: send the sense buffer down without copying 

Now that the block submission path correctly bounces, we can simply
use the command sense_buffer to send to retrieve sense information and
junk the unnecessary page allocation.

Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
James Bottomley 2007-05-22 14:43:14 -05:00 committed by James Bottomley
parent a6123f1429
commit 355dfa1bc8
1 changed files with 3 additions and 23 deletions
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26
drivers/scsi/scsi_error.c
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@ -18,12 +18,12 @@
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>
@ -640,16 +640,8 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
memcpy(scmd->cmnd, cmnd, cmnd_size);
if (copy_sense) {
gfp_t gfp_mask = GFP_ATOMIC;
if (shost->hostt->unchecked_isa_dma)
gfp_mask |= __GFP_DMA;
sgl.page = alloc_page(gfp_mask);
if (!sgl.page)
return FAILED;
sgl.offset = 0;
sgl.length = 252;
sg_init_one(&sgl, scmd->sense_buffer,
sizeof(scmd->sense_buffer));
scmd->sc_data_direction = DMA_FROM_DEVICE;
scmd->request_bufflen = sgl.length;
@ -719,18 +711,6 @@ static int scsi_send_eh_cmnd(struct scsi_cmnd *scmd, unsigned char *cmnd,
}
/*
* Last chance to have valid sense data.
*/
if (copy_sense) {
if (!SCSI_SENSE_VALID(scmd)) {
memcpy(scmd->sense_buffer, page_address(sgl.page),
sizeof(scmd->sense_buffer));
}
__free_page(sgl.page);
}
/*
* Restore original data
*/