From htejun@gmail.com Thu Sep 20 00:05:23 2007 From: Tejun Heo Date: Thu, 20 Sep 2007 16:05:10 +0900 Subject: sysfs: kill unnecessary sysfs_get() in open paths To: ebiederm@xmission.com, cornelia.huck@de.ibm.com, greg@kroah.com, stern@rowland.harvard.edu, kay.sievers@vrfy.org, linux-kernel@vger.kernel.org, htejun@gmail.com Cc: Tejun Heo Message-ID: <11902719102893-git-send-email-htejun@gmail.com> There's no reason to get an extra reference to sysfs_dirent for an open file. Open file has a reference to the dentry which in turn has a reference to sysfs_dirent. This is fairly obvious as otherwise open itself won't be able to access the sysfs_dirent. Kill the extra sysfs_get() and matching sysfs_put(). Signed-off-by: Tejun Heo Acked-by: Cornelia Huck Signed-off-by: Greg Kroah-Hartman --- fs/sysfs/bin.c | 4 +--- fs/sysfs/file.c | 6 +----- 2 files changed, 2 insertions(+), 8 deletions(-) --- a/fs/sysfs/bin.c +++ b/fs/sysfs/bin.c @@ -193,9 +193,8 @@ static int open(struct inode * inode, st mutex_init(&bb->mutex); file->private_data = bb; - /* open succeeded, put active reference and pin attr_sd */ + /* open succeeded, put active reference */ sysfs_put_active(attr_sd); - sysfs_get(attr_sd); return 0; err_out: @@ -211,7 +210,6 @@ static int release(struct inode * inode, if (bb->mmapped) sysfs_put_active_two(attr_sd); - sysfs_put(attr_sd); kfree(bb->buffer); kfree(bb); return 0; --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -298,9 +298,8 @@ static int sysfs_open_file(struct inode buffer->ops = ops; file->private_data = buffer; - /* open succeeded, put active references and pin attr_sd */ + /* open succeeded, put active references */ sysfs_put_active_two(attr_sd); - sysfs_get(attr_sd); return 0; err_out: @@ -310,11 +309,8 @@ static int sysfs_open_file(struct inode static int sysfs_release(struct inode * inode, struct file * filp) { - struct sysfs_dirent *attr_sd = filp->f_path.dentry->d_fsdata; struct sysfs_buffer *buffer = filp->private_data; - sysfs_put(attr_sd); - if (buffer) { if (buffer->page) free_page((unsigned long)buffer->page);