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[SCSI] bnx2fc: Handle bnx2fc_map_sg failure

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Gracefully handle bnx2fc_map_sg failure, so that queuecommand returns host busy
and SCSI-ml can retry the IO.

Signed-off-by: Bhanu Prakash Gollapudi <bprakash@broadcom.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Bhanu Prakash Gollapudi 2011-09-19 16:52:13 -07:00 committed by James Bottomley
parent 3ce41ea147
commit 822f29032b
1 changed files with 15 additions and 5 deletions
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20
drivers/scsi/bnx2fc/bnx2fc_io.c
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@ -17,7 +17,7 @@
static int bnx2fc_split_bd(struct bnx2fc_cmd *io_req, u64 addr, int sg_len,
int bd_index);
static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req);
static void bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req);
static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req);
static void bnx2fc_free_mp_resc(struct bnx2fc_cmd *io_req);
static void bnx2fc_parse_fcp_rsp(struct bnx2fc_cmd *io_req,
@ -1607,20 +1607,24 @@ static int bnx2fc_map_sg(struct bnx2fc_cmd *io_req)
return bd_count;
}
static void bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
static int bnx2fc_build_bd_list_from_sg(struct bnx2fc_cmd *io_req)
{
struct scsi_cmnd *sc = io_req->sc_cmd;
struct fcoe_bd_ctx *bd = io_req->bd_tbl->bd_tbl;
int bd_count;
if (scsi_sg_count(sc))
if (scsi_sg_count(sc)) {
bd_count = bnx2fc_map_sg(io_req);
else {
if (bd_count == 0)
return -ENOMEM;
} else {
bd_count = 0;
bd[0].buf_addr_lo = bd[0].buf_addr_hi = 0;
bd[0].buf_len = bd[0].flags = 0;
}
io_req->bd_tbl->bd_valid = bd_count;
return 0;
}
static void bnx2fc_unmap_sg_list(struct bnx2fc_cmd *io_req)
@ -1942,7 +1946,13 @@ int bnx2fc_post_io_req(struct bnx2fc_rport *tgt,
xid = io_req->xid;
/* Build buffer descriptor list for firmware from sg list */
bnx2fc_build_bd_list_from_sg(io_req);
if (bnx2fc_build_bd_list_from_sg(io_req)) {
printk(KERN_ERR PFX "BD list creation failed\n");
spin_lock_bh(&tgt->tgt_lock);
kref_put(&io_req->refcount, bnx2fc_cmd_release);
spin_unlock_bh(&tgt->tgt_lock);
return -EAGAIN;
}
task_idx = xid / BNX2FC_TASKS_PER_PAGE;
index = xid % BNX2FC_TASKS_PER_PAGE;