From: Bart Van Assche <bvanassche@xxxxxxx>
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@xxxxxxx>
[ broken out and small cleanups by David Dillow ]
Signed-off-by: David Dillow <dillowda@xxxxxxxx>
---
drivers/infiniband/ulp/srp/ib_srp.c | 21 ++++++++++++---------
drivers/infiniband/ulp/srp/ib_srp.h | 1 -
2 files changed, 12 insertions(+), 10 deletions(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index aa78d26..6f36dbe 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -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);
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);
diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
index 41ecb46..924d8e9 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.h
+++ b/drivers/infiniband/ulp/srp/ib_srp.h
@@ -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;
--
1.7.3.4
--
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