diff --git a/drivers/infiniband/sw/siw/siw_mem.c b/drivers/infiniband/sw/siw/siw_mem.c
index 61c17db70d65..bf69566e2eb6 100644
--- a/drivers/infiniband/sw/siw/siw_mem.c
+++ b/drivers/infiniband/sw/siw/siw_mem.c
@@ -398,7 +398,7 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 
 	mlock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
 
-	if (num_pages + atomic64_read(&mm_s->pinned_vm) > mlock_limit) {
+	if (atomic64_add_return(num_pages, &mm_s->pinned_vm) > mlock_limit) {
 		rv = -ENOMEM;
 		goto out_sem_up;
 	}
@@ -411,18 +411,16 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 		goto out_sem_up;
 	}
 	for (i = 0; num_pages; i++) {
-		int got, nents = min_t(int, num_pages, PAGES_PER_CHUNK);
-
-		umem->page_chunk[i].plist =
+		int nents = min_t(int, num_pages, PAGES_PER_CHUNK);
+		struct page **plist =
 			kcalloc(nents, sizeof(struct page *), GFP_KERNEL);
-		if (!umem->page_chunk[i].plist) {
+
+		if (!plist) {
 			rv = -ENOMEM;
 			goto out_sem_up;
 		}
-		got = 0;
+		umem->page_chunk[i].plist = plist;
 		while (nents) {
-			struct page **plist = &umem->page_chunk[i].plist[got];
-
 			rv = pin_user_pages(first_page_va, nents,
 					    foll_flags | FOLL_LONGTERM,
 					    plist, NULL);
@@ -430,12 +428,11 @@ struct siw_umem *siw_umem_get(u64 start, u64 len, bool writable)
 				goto out_sem_up;
 
 			umem->num_pages += rv;
-			atomic64_add(rv, &mm_s->pinned_vm);
 			first_page_va += rv * PAGE_SIZE;
+			plist += rv;
 			nents -= rv;
-			got += rv;
+			num_pages -= rv;
 		}
-		num_pages -= got;
 	}
 out_sem_up:
 	mmap_read_unlock(mm_s);
@@ -443,6 +440,10 @@ out_sem_up:
 	if (rv > 0)
 		return umem;
 
+	/* Adjust accounting for pages not pinned */
+	if (num_pages)
+		atomic64_sub(num_pages, &mm_s->pinned_vm);
+
 	siw_umem_release(umem, false);
 
 	return ERR_PTR(rv);