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Date:   Fri,  8 May 2020 17:36:34 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alexander Viro <viro@...iv.linux.org.uk>
Cc:     linux-integrity@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-gpio@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-rdma@...r.kernel.org, kvm@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, io-uring@...r.kernel.org,
        netdev@...r.kernel.org, bpf@...r.kernel.org
Subject: [PATCH 12/12] vtpm_proxy: use __anon_inode_getfd

Use __anon_inode_getfd instead of opencoding the logic using
get_unused_fd_flags + anon_inode_getfile.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 drivers/char/tpm/tpm_vtpm_proxy.c | 23 +++++------------------
 1 file changed, 5 insertions(+), 18 deletions(-)

diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
index 91c772e38bb54..4c0a31209ae5a 100644
--- a/drivers/char/tpm/tpm_vtpm_proxy.c
+++ b/drivers/char/tpm/tpm_vtpm_proxy.c
@@ -534,7 +534,7 @@ static struct file *vtpm_proxy_create_device(
 				 struct vtpm_proxy_new_dev *vtpm_new_dev)
 {
 	struct proxy_dev *proxy_dev;
-	int rc, fd;
+	int fd;
 	struct file *file;
 
 	if (vtpm_new_dev->flags & ~VTPM_PROXY_FLAGS_ALL)
@@ -546,19 +546,10 @@ static struct file *vtpm_proxy_create_device(
 
 	proxy_dev->flags = vtpm_new_dev->flags;
 
-	/* setup an anonymous file for the server-side */
-	fd = get_unused_fd_flags(O_RDWR);
-	if (fd < 0) {
-		rc = fd;
+	fd = __anon_inode_getfd("[vtpms]", &vtpm_proxy_fops, proxy_dev, O_RDWR,
+			&file);
+	if (fd < 0)
 		goto err_delete_proxy_dev;
-	}
-
-	file = anon_inode_getfile("[vtpms]", &vtpm_proxy_fops, proxy_dev,
-				  O_RDWR);
-	if (IS_ERR(file)) {
-		rc = PTR_ERR(file);
-		goto err_put_unused_fd;
-	}
 
 	/* from now on we can unwind with put_unused_fd() + fput() */
 	/* simulate an open() on the server side */
@@ -576,13 +567,9 @@ static struct file *vtpm_proxy_create_device(
 
 	return file;
 
-err_put_unused_fd:
-	put_unused_fd(fd);
-
 err_delete_proxy_dev:
 	vtpm_proxy_delete_proxy_dev(proxy_dev);
-
-	return ERR_PTR(rc);
+	return ERR_PTR(fd);
 }
 
 /*
-- 
2.26.2

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