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