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IB/srp: don't move active requests to their own list 

We use req->scmnd != NULL to indicate an active request, so there's no
need to keep a separate list for them. We can afford the array iteration
during error handling, and dropping it gives us one less item that needs
lock protection.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
[ broken out and small cleanups by David Dillow ]
Signed-off-by: David Dillow <dillowda@ornl.gov>
This commit is contained in:
Bart Van Assche 2010-11-26 13:58:27 -05:00 committed by David Dillow
parent dcb4cb85f4
commit 536ae14e75
2 changed files with 13 additions and 11 deletions
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23
drivers/infiniband/ulp/srp/ib_srp.c
View File

@ -553,7 +553,7 @@ static void srp_remove_req(struct srp_target_port *target, struct srp_request *r
{
srp_unmap_data(req->scmnd, target, req);
req->scmnd = NULL;
list_move_tail(&req->list, &target->free_reqs);
list_add_tail(&req->list, &target->free_reqs);
}
static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
@ -566,7 +566,6 @@ static void srp_reset_req(struct srp_target_port *target, struct srp_request *re
static int srp_reconnect_target(struct srp_target_port *target)
{
struct ib_qp_attr qp_attr;
struct srp_request *req, *tmp;
struct ib_wc wc;
int i, ret;
@ -597,13 +596,16 @@ static int srp_reconnect_target(struct srp_target_port *target)
; /* nothing */
spin_lock_irq(target->scsi_host->host_lock);
list_for_each_entry_safe(req, tmp, &target->req_queue, list)
srp_reset_req(target, req);
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
struct srp_request *req = &target->req_ring[i];
if (req->scmnd)
srp_reset_req(target, req);
}
spin_unlock_irq(target->scsi_host->host_lock);
list_del_init(&target->free_tx);
INIT_LIST_HEAD(&target->free_tx);
for (i = 0; i < SRP_SQ_SIZE; ++i)
list_move(&target->tx_ring[i]->list, &target->free_tx);
list_add(&target->tx_ring[i]->list, &target->free_tx);
target->qp_in_error = 0;
ret = srp_connect_target(target);
@ -1165,7 +1167,7 @@ static int srp_queuecommand_lck(struct scsi_cmnd *scmnd,
goto err_unmap;
}
list_move_tail(&req->list, &target->req_queue);
list_del(&req->list);
return 0;
@ -1504,7 +1506,7 @@ static int srp_abort(struct scsi_cmnd *scmnd)
static int srp_reset_device(struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
struct srp_request *req, *tmp;
int i;
shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
@ -1518,9 +1520,11 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
spin_lock_irq(target->scsi_host->host_lock);
list_for_each_entry_safe(req, tmp, &target->req_queue, list)
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
struct srp_request *req = &target->req_ring[i];
if (req->scmnd && req->scmnd->device == scmnd->device)
srp_reset_req(target, req);
}
spin_unlock_irq(target->scsi_host->host_lock);
@ -1954,7 +1958,6 @@ static ssize_t srp_create_target(struct device *dev,
INIT_LIST_HEAD(&target->free_tx);
INIT_LIST_HEAD(&target->free_reqs);
INIT_LIST_HEAD(&target->req_queue);
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
target->req_ring[i].index = i;
list_add_tail(&target->req_ring[i].list, &target->free_reqs);

1
drivers/infiniband/ulp/srp/ib_srp.h
View File

@ -148,7 +148,6 @@ struct srp_target_port {
struct srp_iu *tx_ring[SRP_SQ_SIZE];
struct list_head free_reqs;
struct list_head req_queue;
struct srp_request req_ring[SRP_CMD_SQ_SIZE];
struct work_struct work;