From: Leon Romanovsky <leonro@mellanox.com>
Date: Tue, 12 Feb 2019 18:39:15 +0000 (+0200)
Subject: RDMA/cxgb4: Remove kref accounting for sync operation
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=cfe876d8e6b0491170d44c8040c518b121957104;p=linux.git

RDMA/cxgb4: Remove kref accounting for sync operation

Ucontext allocation and release aren't async events and don't need kref
accounting. The common layer of RDMA subsystem ensures that dealloc
ucontext will be called after all other objects are released.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Steve Wise <swise@opengridcomputing.com>
Tested-by: Raju Rangoju <rajur@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
---

diff --git a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
index 3a0923f7c60e7..5a5da41faef6a 100644
--- a/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
+++ b/drivers/infiniband/hw/cxgb4/iw_cxgb4.h
@@ -589,7 +589,6 @@ struct c4iw_ucontext {
 	u32 key;
 	spinlock_t mmap_lock;
 	struct list_head mmaps;
-	struct kref kref;
 	bool is_32b_cqe;
 };
 
@@ -598,18 +597,6 @@ static inline struct c4iw_ucontext *to_c4iw_ucontext(struct ib_ucontext *c)
 	return container_of(c, struct c4iw_ucontext, ibucontext);
 }
 
-void _c4iw_free_ucontext(struct kref *kref);
-
-static inline void c4iw_put_ucontext(struct c4iw_ucontext *ucontext)
-{
-	kref_put(&ucontext->kref, _c4iw_free_ucontext);
-}
-
-static inline void c4iw_get_ucontext(struct c4iw_ucontext *ucontext)
-{
-	kref_get(&ucontext->kref);
-}
-
 struct c4iw_mm_entry {
 	struct list_head entry;
 	u64 addr;
diff --git a/drivers/infiniband/hw/cxgb4/provider.c b/drivers/infiniband/hw/cxgb4/provider.c
index 680b5e98491d3..81fcffb597abd 100644
--- a/drivers/infiniband/hw/cxgb4/provider.c
+++ b/drivers/infiniband/hw/cxgb4/provider.c
@@ -58,28 +58,19 @@ static int fastreg_support = 1;
 module_param(fastreg_support, int, 0644);
 MODULE_PARM_DESC(fastreg_support, "Advertise fastreg support (default=1)");
 
-void _c4iw_free_ucontext(struct kref *kref)
+static int c4iw_dealloc_ucontext(struct ib_ucontext *context)
 {
-	struct c4iw_ucontext *ucontext;
+	struct c4iw_ucontext *ucontext = to_c4iw_ucontext(context);
 	struct c4iw_dev *rhp;
 	struct c4iw_mm_entry *mm, *tmp;
 
-	ucontext = container_of(kref, struct c4iw_ucontext, kref);
+	pr_debug("context %p\n", context);
 	rhp = to_c4iw_dev(ucontext->ibucontext.device);
 
-	pr_debug("ucontext %p\n", ucontext);
 	list_for_each_entry_safe(mm, tmp, &ucontext->mmaps, entry)
 		kfree(mm);
 	c4iw_release_dev_ucontext(&rhp->rdev, &ucontext->uctx);
 	kfree(ucontext);
-}
-
-static int c4iw_dealloc_ucontext(struct ib_ucontext *context)
-{
-	struct c4iw_ucontext *ucontext = to_c4iw_ucontext(context);
-
-	pr_debug("context %p\n", context);
-	c4iw_put_ucontext(ucontext);
 	return 0;
 }
 
@@ -102,7 +93,6 @@ static struct ib_ucontext *c4iw_alloc_ucontext(struct ib_device *ibdev,
 	c4iw_init_dev_ucontext(&rhp->rdev, &context->uctx);
 	INIT_LIST_HEAD(&context->mmaps);
 	spin_lock_init(&context->mmap_lock);
-	kref_init(&context->kref);
 
 	if (udata->outlen < sizeof(uresp) - sizeof(uresp.reserved)) {
 		pr_err_once("Warning - downlevel libcxgb4 (non-fatal), device status page disabled\n");
diff --git a/drivers/infiniband/hw/cxgb4/qp.c b/drivers/infiniband/hw/cxgb4/qp.c
index 2509f65f44204..d3a82839f5ea0 100644
--- a/drivers/infiniband/hw/cxgb4/qp.c
+++ b/drivers/infiniband/hw/cxgb4/qp.c
@@ -904,8 +904,6 @@ static void free_qp_work(struct work_struct *work)
 	destroy_qp(&rhp->rdev, &qhp->wq,
 		   ucontext ? &ucontext->uctx : &rhp->rdev.uctx, !qhp->srq);
 
-	if (ucontext)
-		c4iw_put_ucontext(ucontext);
 	c4iw_put_wr_wait(qhp->wr_waitp);
 	kfree(qhp);
 }
@@ -2338,7 +2336,6 @@ struct ib_qp *c4iw_create_qp(struct ib_pd *pd, struct ib_qp_init_attr *attrs,
 			insert_mmap(ucontext, ma_sync_key_mm);
 		}
 
-		c4iw_get_ucontext(ucontext);
 		qhp->ucontext = ucontext;
 	}
 	if (!attrs->srq) {