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SG: audit of drivers that use blk_rq_map_sg() 

They need to properly init the sg table, or blk_rq_map_sg() will
complain if CONFIG_DEBUG_SG is set.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2007-10-24 13:21:21 +02:00
parent 23464ffa47
commit 3d1266c704
3 changed files with 9 additions and 5 deletions
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10
drivers/block/virtio_blk.c
View File

@ -4,7 +4,9 @@
#include <linux/hdreg.h>
#include <linux/virtio.h>
#include <linux/virtio_blk.h>
#include <linux/virtio_blk.h>
#include <linux/scatterlist.h>
#define VIRTIO_MAX_SG (3+MAX_PHYS_SEGMENTS)
static unsigned char virtblk_index = 'a';
struct virtio_blk
@ -23,7 +25,7 @@ struct virtio_blk
mempool_t *pool;
/* Scatterlist: can be too big for stack. */
struct scatterlist sg[3+MAX_PHYS_SEGMENTS];
struct scatterlist sg[VIRTIO_MAX_SG];
};
struct virtblk_req
@ -94,8 +96,8 @@ static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
if (blk_barrier_rq(vbr->req))
vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER;
/* We have to zero this, otherwise blk_rq_map_sg gets upset. */
memset(vblk->sg, 0, sizeof(vblk->sg));
/* This init could be done at vblk creation time */
sg_init_table(vblk->sg, VIRTIO_MAX_SG);
sg_set_buf(&vblk->sg[0], &vbr->out_hdr, sizeof(vbr->out_hdr));
num = blk_rq_map_sg(q, vbr->req, vblk->sg+1);
sg_set_buf(&vblk->sg[num+1], &vbr->in_hdr, sizeof(vbr->in_hdr));

3
drivers/cdrom/viocd.c
View File

@ -41,9 +41,9 @@
#include <linux/completion.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/scatterlist.h>
#include <asm/vio.h>
#include <asm/scatterlist.h>
#include <asm/iseries/hv_types.h>
#include <asm/iseries/hv_lp_event.h>
#include <asm/iseries/vio.h>
@ -258,6 +258,7 @@ static int send_request(struct request *req)
cmd = viomajorsubtype_cdio | viocdwrite;
}
sg_init_table(&sg, 1);
if (blk_rq_map_sg(req->q, req, &sg) == 0) {
printk(VIOCD_KERN_WARNING
"error setting up scatter/gather list\n");

1
drivers/message/i2o/i2o_block.c
View File

@ -284,6 +284,7 @@ static inline struct i2o_block_request *i2o_block_request_alloc(void)
return ERR_PTR(-ENOMEM);
INIT_LIST_HEAD(&ireq->queue);
sg_init_table(ireq->sg_table, I2O_MAX_PHYS_SEGMENTS);
return ireq;
};