fscrypt: remove 'ci' parameter from fscrypt_put_encryption_info()

fscrypt_put_encryption_info() is only called when evicting an inode, so
the 'struct fscrypt_info *ci' parameter is always NULL, and there cannot
be races with other threads.  This was cruft left over from the broken
key revocation code.  Remove the unused parameter and the cmpxchg().

Also remove the #ifdefs around the fscrypt_put_encryption_info() calls,
since fscrypt_notsupp.h defines a no-op stub for it.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

1 files changed, 3 insertions, 13 deletions

diff --git a/fs/crypto/keyinfo.c b/fs/crypto/keyinfo.c
index c115eac4b4cf..05f5ee1f0705 100644
--- a/fs/crypto/keyinfo.c
+++ b/fs/crypto/keyinfo.c
@@ -355,19 +355,9 @@ out:
 }
 EXPORT_SYMBOL(fscrypt_get_encryption_info);
 
-void fscrypt_put_encryption_info(struct inode *inode, struct fscrypt_info *ci)
+void fscrypt_put_encryption_info(struct inode *inode)
 {
-        struct fscrypt_info *prev;
-
-        if (ci == NULL)
-                ci = READ_ONCE(inode->i_crypt_info);
-        if (ci == NULL)
-                return;
-
-        prev = cmpxchg(&inode->i_crypt_info, ci, NULL);
-        if (prev != ci)
-                return;
-
-        put_crypt_info(ci);
+        put_crypt_info(inode->i_crypt_info);
+        inode->i_crypt_info = NULL;
 }
 EXPORT_SYMBOL(fscrypt_put_encryption_info);