IB/uverbs: Add a uobj_perform_destroy helper

This consolidates a bunch of repeated code patterns into a helper.
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>

drivers/infiniband/core/rdma_core.c

@@ -128,6 +128,28 @@ static int uverbs_try_lock_object(struct ib_uobject *uobj, bool exclusive)
 	return atomic_cmpxchg(&uobj->usecnt, 0, -1) == 0 ? 0 : -EBUSY;
 }
 
+/*
+ * Does both rdma_lookup_get_uobject() and rdma_remove_commit_uobject(), then
+ * returns success_res on success (negative errno on failure). For use by
+ * callers that do not need the uobj.
+ */
+int __uobj_perform_destroy(const struct uverbs_obj_type *type, int id,
+			   struct ib_uverbs_file *ufile, int success_res)
+{
+	struct ib_uobject *uobj;
+	int ret;
+
+	uobj = rdma_lookup_get_uobject(type, ufile->ucontext, id, true);
+	if (IS_ERR(uobj))
+		return PTR_ERR(uobj);
+
+	ret = rdma_remove_commit_uobject(uobj);
+	if (ret)
+		return ret;
+
+	return success_res;
+}
+
 static struct ib_uobject *alloc_uobj(struct ib_ucontext *context,
 				     const struct uverbs_obj_type *type)
 {

drivers/infiniband/core/uverbs_cmd.c

@@ -367,20 +367,12 @@ ssize_t ib_uverbs_dealloc_pd(struct ib_uverbs_file *file,
 			     int in_len, int out_len)
 {
 	struct ib_uverbs_dealloc_pd cmd;
-	struct ib_uobject          *uobj;
-	int                         ret;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_PD, cmd.pd_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-
-	return ret ?: in_len;
+	return uobj_perform_destroy(UVERBS_OBJECT_PD, cmd.pd_handle, file,
+				    in_len);
 }
 
 struct xrcd_table_entry {
@@ -597,19 +589,12 @@ ssize_t ib_uverbs_close_xrcd(struct ib_uverbs_file *file,
 			     int out_len)
 {
 	struct ib_uverbs_close_xrcd cmd;
-	struct ib_uobject           *uobj;
-	int                         ret = 0;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_XRCD, cmd.xrcd_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-	return ret ?: in_len;
+	return uobj_perform_destroy(UVERBS_OBJECT_XRCD, cmd.xrcd_handle, file,
+				    in_len);
 }
 
 int ib_uverbs_dealloc_xrcd(struct ib_uobject *uobject,
@@ -829,20 +814,12 @@ ssize_t ib_uverbs_dereg_mr(struct ib_uverbs_file *file,
 			   int out_len)
 {
 	struct ib_uverbs_dereg_mr cmd;
-	struct ib_uobject	 *uobj;
-	int                       ret = -EINVAL;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_MR, cmd.mr_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-
-	return ret ?: in_len;
+	return uobj_perform_destroy(UVERBS_OBJECT_MR, cmd.mr_handle, file,
+				    in_len);
 }
 
 ssize_t ib_uverbs_alloc_mw(struct ib_uverbs_file *file,
@@ -921,19 +898,12 @@ ssize_t ib_uverbs_dealloc_mw(struct ib_uverbs_file *file,
 			     int out_len)
 {
 	struct ib_uverbs_dealloc_mw cmd;
-	struct ib_uobject	   *uobj;
-	int                         ret = -EINVAL;
 
 	if (copy_from_user(&cmd, buf, sizeof(cmd)))
 		return -EFAULT;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_MW, cmd.mw_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-	return ret ?: in_len;
+	return uobj_perform_destroy(UVERBS_OBJECT_MW, cmd.mw_handle, file,
+				    in_len);
 }
 
 ssize_t ib_uverbs_create_comp_channel(struct ib_uverbs_file *file,
@@ -2641,19 +2611,12 @@ ssize_t ib_uverbs_destroy_ah(struct ib_uverbs_file *file,
 			     const char __user *buf, int in_len, int out_len)
 {
 	struct ib_uverbs_destroy_ah cmd;
-	struct ib_uobject	   *uobj;
-	int			    ret;
 
 	if (copy_from_user(&cmd, buf, sizeof cmd))
 		return -EFAULT;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_AH, cmd.ah_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-	return ret ?: in_len;
+	return uobj_perform_destroy(UVERBS_OBJECT_AH, cmd.ah_handle, file,
+				    in_len);
 }
 
 ssize_t ib_uverbs_attach_mcast(struct ib_uverbs_file *file,
@@ -3445,7 +3408,6 @@ int ib_uverbs_ex_destroy_rwq_ind_table(struct ib_uverbs_file *file,
 				       struct ib_udata *uhw)
 {
 	struct ib_uverbs_ex_destroy_rwq_ind_table	cmd = {};
-	struct ib_uobject		*uobj;
 	int			ret;
 	size_t required_cmd_sz;
 
@@ -3466,12 +3428,8 @@ int ib_uverbs_ex_destroy_rwq_ind_table(struct ib_uverbs_file *file,
 	if (cmd.comp_mask)
 		return -EOPNOTSUPP;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_RWQ_IND_TBL, cmd.ind_tbl_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	return uobj_remove_commit(uobj);
+	return uobj_perform_destroy(UVERBS_OBJECT_RWQ_IND_TBL,
+				    cmd.ind_tbl_handle, file, 0);
 }
 
 int ib_uverbs_ex_create_flow(struct ib_uverbs_file *file,
@@ -3658,7 +3616,6 @@ int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
 			      struct ib_udata *uhw)
 {
 	struct ib_uverbs_destroy_flow	cmd;
-	struct ib_uobject		*uobj;
 	int				ret;
 
 	if (ucore->inlen < sizeof(cmd))
@@ -3671,13 +3628,8 @@ int ib_uverbs_ex_destroy_flow(struct ib_uverbs_file *file,
 	if (cmd.comp_mask)
 		return -EINVAL;
 
-	uobj  = uobj_get_write(UVERBS_OBJECT_FLOW, cmd.flow_handle,
-			       file->ucontext);
-	if (IS_ERR(uobj))
-		return PTR_ERR(uobj);
-
-	ret = uobj_remove_commit(uobj);
-	return ret;
+	return uobj_perform_destroy(UVERBS_OBJECT_FLOW, cmd.flow_handle, file,
+				    0);
 }
 
 static int __uverbs_create_xsrq(struct ib_uverbs_file *file,

include/rdma/uverbs_std_types.h

@@ -71,6 +71,11 @@ static inline struct ib_uobject *__uobj_get(const struct uverbs_obj_type *type,
 #define uobj_get_write(_type, _id, _ucontext)				\
 	 __uobj_get(uobj_get_type(_type), true, _ucontext, _id)
 
+int __uobj_perform_destroy(const struct uverbs_obj_type *type, int id,
+			   struct ib_uverbs_file *ufile, int success_res);
+#define uobj_perform_destroy(_type, _id, _ufile, _success_res)                 \
+	__uobj_perform_destroy(uobj_get_type(_type), _id, _ufile, _success_res)
+
 static inline void uobj_put_read(struct ib_uobject *uobj)
 {
 	rdma_lookup_put_uobject(uobj, false);