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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>
This commit is contained in:
Dave Jiang 2011-05-25 02:21:57 +00:00 committed by Dan Williams
parent 8db02da528
commit 77d67385f7
1 changed files with 10 additions and 16 deletions
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26
drivers/scsi/isci/request.c
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@ -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;
}