From: Michael S. Tsirkin <mst@mellanox.co.il>
Date: Fri, 14 Jul 2006 07:23:55 +0000 (-0700)
Subject: [PATCH] fmr pool: remove unnecessary pointer dereference
X-Git-Tag: v2.6.18-rc2~71
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=adfaa888a292e7f38fb43668d8994f246e371f0f;p=linux-2.6

[PATCH] fmr pool: remove unnecessary pointer dereference

ib_fmr_pool_map_phys gets the virtual address by pointer but never writes
there, and users (e.g.  srp) seem to assume this and ignore the value
returned.  This patch cleans up the API to get the VA by value, and updates
all users.

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>
Acked-by: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/drivers/infiniband/core/fmr_pool.c b/drivers/infiniband/core/fmr_pool.c
index 615fe9cc6c..86a3b2d401 100644
--- a/drivers/infiniband/core/fmr_pool.c
+++ b/drivers/infiniband/core/fmr_pool.c
@@ -426,7 +426,7 @@ EXPORT_SYMBOL(ib_flush_fmr_pool);
 struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
 					 u64                *page_list,
 					 int                 list_len,
-					 u64                *io_virtual_address)
+					 u64                 io_virtual_address)
 {
 	struct ib_fmr_pool *pool = pool_handle;
 	struct ib_pool_fmr *fmr;
@@ -440,7 +440,7 @@ struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
 	fmr = ib_fmr_cache_lookup(pool,
 				  page_list,
 				  list_len,
-				  *io_virtual_address);
+				  io_virtual_address);
 	if (fmr) {
 		/* found in cache */
 		++fmr->ref_count;
@@ -464,7 +464,7 @@ struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
 	spin_unlock_irqrestore(&pool->pool_lock, flags);
 
 	result = ib_map_phys_fmr(fmr->fmr, page_list, list_len,
-				 *io_virtual_address);
+				 io_virtual_address);
 
 	if (result) {
 		spin_lock_irqsave(&pool->pool_lock, flags);
@@ -481,7 +481,7 @@ struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
 	fmr->ref_count = 1;
 
 	if (pool->cache_bucket) {
-		fmr->io_virtual_address = *io_virtual_address;
+		fmr->io_virtual_address = io_virtual_address;
 		fmr->page_list_len      = list_len;
 		memcpy(fmr->page_list, page_list, list_len * sizeof(*page_list));
 
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
index ff117bbf81..72febf1f8f 100644
--- a/drivers/infiniband/ulp/iser/iser_verbs.c
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -594,7 +594,7 @@ int iser_reg_page_vec(struct iser_conn     *ib_conn,
 	mem  = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
 				    page_list,
 				    page_vec->length,
-				    &io_addr);
+				    io_addr);
 
 	if (IS_ERR(mem)) {
 		status = (int)PTR_ERR(mem);
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 619118080b..8f472e7113 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -615,7 +615,7 @@ static int srp_map_fmr(struct srp_device *dev, struct scatterlist *scat,
 				(sg_dma_address(&scat[i]) & dev->fmr_page_mask) + j;
 
 	req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
-					dma_pages, page_cnt, &io_addr);
+					dma_pages, page_cnt, io_addr);
 	if (IS_ERR(req->fmr)) {
 		ret = PTR_ERR(req->fmr);
 		req->fmr = NULL;
diff --git a/include/rdma/ib_fmr_pool.h b/include/rdma/ib_fmr_pool.h
index 4ace54cd0c..00dadbf94e 100644
--- a/include/rdma/ib_fmr_pool.h
+++ b/include/rdma/ib_fmr_pool.h
@@ -88,7 +88,7 @@ int ib_flush_fmr_pool(struct ib_fmr_pool *pool);
 struct ib_pool_fmr *ib_fmr_pool_map_phys(struct ib_fmr_pool *pool_handle,
 					 u64                *page_list,
 					 int                 list_len,
-					 u64                *io_virtual_address);
+					 u64                 io_virtual_address);
 
 int ib_fmr_pool_unmap(struct ib_pool_fmr *fmr);