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[SCSI] bfa: fix the issue of not handling scsi_cmnd sg chaining case 

Currently the driver doesn't take into consideraion of possible sg chaining
when it walks through the sg list. This is fixed by using the sg_next()
which automatically handles the chaining case. Obosolete code is removed
as a result of this change.

Signed-off-by: Jing Huang <huangj@brocade.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Jing Huang 2010-03-19 11:06:05 -07:00 committed by James Bottomley
parent b504293fe9
commit 2eba0d4c00
2 changed files with 17 additions and 34 deletions
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29
drivers/scsi/bfa/bfa_cb_ioim_macros.h
View File

@ -116,35 +116,6 @@ bfa_cb_ioim_get_timeout(struct bfad_ioim_s *dio)
return 0;
}
/**
* Get SG element for the I/O request given the SG element index
*/
static inline union bfi_addr_u
bfa_cb_ioim_get_sgaddr(struct bfad_ioim_s *dio, int sgeid)
{
struct scsi_cmnd *cmnd = (struct scsi_cmnd *)dio;
struct scatterlist *sge;
u64 addr;
sge = (struct scatterlist *)scsi_sglist(cmnd) + sgeid;
addr = (u64) sg_dma_address(sge);
return *((union bfi_addr_u *) &addr);
}
static inline u32
bfa_cb_ioim_get_sglen(struct bfad_ioim_s *dio, int sgeid)
{
struct scsi_cmnd *cmnd = (struct scsi_cmnd *)dio;
struct scatterlist *sge;
u32 len;
sge = (struct scatterlist *)scsi_sglist(cmnd) + sgeid;
len = sg_dma_len(sge);
return len;
}
/**
* Get Command Reference Number for the I/O request. 0 if none.
*/

22
drivers/scsi/bfa/bfa_ioim.c
View File

@ -731,6 +731,9 @@ bfa_ioim_send_ioreq(struct bfa_ioim_s *ioim)
static struct fcp_cmnd_s cmnd_z0 = { 0 };
struct bfi_sge_s *sge;
u32 pgdlen = 0;
u64 addr;
struct scatterlist *sg;
struct scsi_cmnd *cmnd = (struct scsi_cmnd *) ioim->dio;
/**
* check for room in queue to send request now
@ -754,8 +757,10 @@ bfa_ioim_send_ioreq(struct bfa_ioim_s *ioim)
*/
sge = &m->sges[0];
if (ioim->nsges) {
sge->sga = bfa_cb_ioim_get_sgaddr(ioim->dio, 0);
pgdlen = bfa_cb_ioim_get_sglen(ioim->dio, 0);
sg = (struct scatterlist *)scsi_sglist(cmnd);
addr = (u64) sg_dma_address(sg);
sge->sga = *(union bfi_addr_u *) &addr;
pgdlen = sg_dma_len(sg);
sge->sg_len = pgdlen;
sge->flags = (ioim->nsges > BFI_SGE_INLINE) ?
BFI_SGE_DATA_CPL : BFI_SGE_DATA_LAST;
@ -868,10 +873,16 @@ bfa_ioim_sgpg_setup(struct bfa_ioim_s *ioim)
struct bfi_sge_s *sge;
struct bfa_sgpg_s *sgpg;
u32 pgcumsz;
u64 addr;
struct scatterlist *sg;
struct scsi_cmnd *cmnd = (struct scsi_cmnd *) ioim->dio;
sgeid = BFI_SGE_INLINE;
ioim->sgpg = sgpg = bfa_q_first(&ioim->sgpg_q);
sg = scsi_sglist(cmnd);
sg = sg_next(sg);
do {
sge = sgpg->sgpg->sges;
nsges = ioim->nsges - sgeid;
@ -879,9 +890,10 @@ bfa_ioim_sgpg_setup(struct bfa_ioim_s *ioim)
nsges = BFI_SGPG_DATA_SGES;
pgcumsz = 0;
for (i = 0; i < nsges; i++, sge++, sgeid++) {
sge->sga = bfa_cb_ioim_get_sgaddr(ioim->dio, sgeid);
sge->sg_len = bfa_cb_ioim_get_sglen(ioim->dio, sgeid);
for (i = 0; i < nsges; i++, sge++, sgeid++, sg = sg_next(sg)) {
addr = (u64) sg_dma_address(sg);
sge->sga = *(union bfi_addr_u *) &addr;
sge->sg_len = sg_dma_len(sg);
pgcumsz += sge->sg_len;
/**