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[09/12] rdma: use __anon_inode_getfd

Message ID 20200508153634.249933-10-hch@lst.de (mailing list archive)
State New, archived
Headers show
Series [01/12] fd: add a new __anon_inode_getfd helper | expand

Commit Message

Christoph Hellwig May 8, 2020, 3:36 p.m. UTC
Use __anon_inode_getfd instead of opencoding the logic using
get_unused_fd_flags + anon_inode_getfile.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 drivers/infiniband/core/rdma_core.c | 17 ++++-------------
 1 file changed, 4 insertions(+), 13 deletions(-)

Comments

Jason Gunthorpe May 8, 2020, 7:52 p.m. UTC | #1
On Fri, May 08, 2020 at 05:36:31PM +0200, Christoph Hellwig wrote:
> Use __anon_inode_getfd instead of opencoding the logic using
> get_unused_fd_flags + anon_inode_getfile.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> ---
>  drivers/infiniband/core/rdma_core.c | 17 ++++-------------
>  1 file changed, 4 insertions(+), 13 deletions(-)

 
> diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
> index 5128cb16bb485..541e5e06347f6 100644
> --- a/drivers/infiniband/core/rdma_core.c
> +++ b/drivers/infiniband/core/rdma_core.c
> @@ -462,30 +462,21 @@ alloc_begin_fd_uobject(const struct uverbs_api_object *obj,
>  	if (WARN_ON(fd_type->fops->release != &uverbs_uobject_fd_release))
>  		return ERR_PTR(-EINVAL);
>  
> -	new_fd = get_unused_fd_flags(O_CLOEXEC);
> -	if (new_fd < 0)
> -		return ERR_PTR(new_fd);
> -
>  	uobj = alloc_uobj(attrs, obj);
>  	if (IS_ERR(uobj))
> -		goto err_fd;
> +		return uobj;
>  
>  	/* Note that uverbs_uobject_fd_release() is called during abort */
> -	filp = anon_inode_getfile(fd_type->name, fd_type->fops, NULL,
> -				  fd_type->flags);
> -	if (IS_ERR(filp)) {
> -		uobj = ERR_CAST(filp);
> +	new_fd = __anon_inode_getfd(fd_type->name, fd_type->fops, NULL,
> +			fd_type->flags | O_CLOEXEC, &filp);
> +	if (new_fd < 0)
>  		goto err_uobj;

This will conflict with a fix (83a267021221 'RDMA/core: Fix
overwriting of uobj in case of error') that is going to go to -rc
soon.

Also the above misses returning an ERR_PTR if __anon_inode_getfd fails, it
returns a uobj that had been freed.. I suppose it should be something
like

if (new_fd < 0) {
   uverbs_uobject_put(uobj);
   return ERR_PTR(new_fd)
}

?

Jason
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Patch

diff --git a/drivers/infiniband/core/rdma_core.c b/drivers/infiniband/core/rdma_core.c
index 5128cb16bb485..541e5e06347f6 100644
--- a/drivers/infiniband/core/rdma_core.c
+++ b/drivers/infiniband/core/rdma_core.c
@@ -462,30 +462,21 @@  alloc_begin_fd_uobject(const struct uverbs_api_object *obj,
 	if (WARN_ON(fd_type->fops->release != &uverbs_uobject_fd_release))
 		return ERR_PTR(-EINVAL);
 
-	new_fd = get_unused_fd_flags(O_CLOEXEC);
-	if (new_fd < 0)
-		return ERR_PTR(new_fd);
-
 	uobj = alloc_uobj(attrs, obj);
 	if (IS_ERR(uobj))
-		goto err_fd;
+		return uobj;
 
 	/* Note that uverbs_uobject_fd_release() is called during abort */
-	filp = anon_inode_getfile(fd_type->name, fd_type->fops, NULL,
-				  fd_type->flags);
-	if (IS_ERR(filp)) {
-		uobj = ERR_CAST(filp);
+	new_fd = __anon_inode_getfd(fd_type->name, fd_type->fops, NULL,
+			fd_type->flags | O_CLOEXEC, &filp);
+	if (new_fd < 0)
 		goto err_uobj;
-	}
 	uobj->object = filp;
-
 	uobj->id = new_fd;
 	return uobj;
 
 err_uobj:
 	uverbs_uobject_put(uobj);
-err_fd:
-	put_unused_fd(new_fd);
 	return uobj;
 }