diff options
| author | Dave Jiang <dave.jiang@intel.com> | 2011-05-25 02:21:57 +0000 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2011-07-03 04:04:50 -0700 |
| commit | 77d67385f7b4a630912fd567f104946be137f477 (patch) | |
| tree | c180e5fd1721aca43d0296a61d36562420d30ac4 | |
| parent | 8db02da52895285e99d7eb2fa825fd393e61d9c5 (diff) | |
| download | linux-77d67385f7b4a630912fd567f104946be137f477.tar.bz2 | |
isci: removing the kmalloc in smp request construct
It doesn't look like there is any reason to do a kmalloc. We can do the
byte swap in place and avoid the allocation. This allow us to remove
a kmalloc and a memcpy.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | drivers/scsi/isci/request.c | 26 |
1 files changed, 10 insertions, 16 deletions
diff --git a/drivers/scsi/isci/request.c b/drivers/scsi/isci/request.c index 063ef04080d5..7c0928ed9e63 100644 --- a/drivers/scsi/isci/request.c +++ b/drivers/scsi/isci/request.c @@ -3187,7 +3187,7 @@ static enum sci_status isci_request_stp_request_construct( */ static void scu_smp_request_construct_task_context(struct scic_sds_request *sci_req, - struct smp_req *smp_req) + ssize_t req_len) { dma_addr_t dma_addr; struct scic_sds_controller *scic; @@ -3197,7 +3197,7 @@ scu_smp_request_construct_task_context(struct scic_sds_request *sci_req, ssize_t word_cnt = sizeof(struct smp_req) / sizeof(u32); /* byte swap the smp request. */ - sci_swab32_cpy(&sci_req->smp.cmd, smp_req, + sci_swab32_cpy(&sci_req->smp.cmd, &sci_req->smp.cmd, word_cnt); task_context = scic_sds_request_get_task_context(sci_req); @@ -3238,7 +3238,7 @@ scu_smp_request_construct_task_context(struct scic_sds_request *sci_req, task_context->address_modifier = 0; /* 10h */ - task_context->ssp_command_iu_length = smp_req->req_len; + task_context->ssp_command_iu_length = req_len; /* 14h */ task_context->transfer_length_bytes = 0; @@ -3299,22 +3299,18 @@ scu_smp_request_construct_task_context(struct scic_sds_request *sci_req, task_context->response_iu_lower = 0; } -static enum sci_status scic_io_request_construct_smp(struct scic_sds_request *sci_req) +static enum sci_status +scic_io_request_construct_smp(struct scic_sds_request *sci_req) { - struct smp_req *smp_req = kmalloc(sizeof(*smp_req), GFP_KERNEL); - - if (!smp_req) - return SCI_FAILURE_INSUFFICIENT_RESOURCES; + struct smp_req *smp_req = &sci_req->smp.cmd; sci_req->protocol = SCIC_SMP_PROTOCOL; - /* Construct the SMP SCU Task Context */ - memcpy(smp_req, &sci_req->smp.cmd, sizeof(*smp_req)); - /* * Look at the SMP requests' header fields; for certain SAS 1.x SMP * functions under SAS 2.0, a zero request length really indicates - * a non-zero default length. */ + * a non-zero default length. + */ if (smp_req->req_len == 0) { switch (smp_req->func) { case SMP_DISCOVER: @@ -3332,12 +3328,10 @@ static enum sci_status scic_io_request_construct_smp(struct scic_sds_request *sc } } - scu_smp_request_construct_task_context(sci_req, smp_req); + scu_smp_request_construct_task_context(sci_req, smp_req->req_len); sci_base_state_machine_change_state(&sci_req->state_machine, - SCI_BASE_REQUEST_STATE_CONSTRUCTED); - - kfree(smp_req); + SCI_BASE_REQUEST_STATE_CONSTRUCTED); return SCI_SUCCESS; } |