From 536ae14e7588e85203d4b4147c041309be5b3efb Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 26 Nov 2010 13:58:27 -0500 Subject: [PATCH] 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 [ broken out and small cleanups by David Dillow ] Signed-off-by: David Dillow --- drivers/infiniband/ulp/srp/ib_srp.c | 23 +++++++++++++---------- drivers/infiniband/ulp/srp/ib_srp.h | 1 - 2 files changed, 13 insertions(+), 11 deletions(-) diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c index aa78d2615c8d..2aff8814f2c5 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); + 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); diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h index 41ecb46adf15..924d8e9c6672 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; -- 2.20.1