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Date: Fri, 12 Oct 2007 15:17:02 -0700 From: Greg Kroah-Hartman <gregkh@...e.de> To: linux-kernel@...r.kernel.org Cc: Tejun Heo <htejun@...il.com>, Greg Kroah-Hartman <gregkh@...e.de> Subject: [PATCH 58/75] sysfs: kill unnecessary sysfs_get() in open paths From: Tejun Heo <htejun@...il.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 <htejun@...il.com> Acked-by: Cornelia Huck <cornelia.huck@...ibm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de> --- fs/sysfs/bin.c | 4 +--- fs/sysfs/file.c | 6 +----- 2 files changed, 2 insertions(+), 8 deletions(-) diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c index a819a7e..e93fe5e 100644 --- a/fs/sysfs/bin.c +++ b/fs/sysfs/bin.c @@ -193,9 +193,8 @@ static int open(struct inode * inode, struct file * file) 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, struct file * file) if (bb->mmapped) sysfs_put_active_two(attr_sd); - sysfs_put(attr_sd); kfree(bb->buffer); kfree(bb); return 0; diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c index 61a8c19..73333dc 100644 --- a/fs/sysfs/file.c +++ b/fs/sysfs/file.c @@ -298,9 +298,8 @@ static int sysfs_open_file(struct inode *inode, struct file *file) 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 *inode, struct file *file) 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); -- 1.5.3.4 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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