linux-kernel - [PATCH 2/2] sysfs: Allow for groups with no attributes

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Date:	Wed, 17 Aug 2011 11:17:02 +0100
From:	Jonathan Cameron <jic23@....ac.uk>
To:	linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	greg@...ah.com, Jonathan Cameron <jic23@....ac.uk>
Subject: [PATCH 2/2] sysfs: Allow for groups with no attributes - grp->attrs = NULL.

One approach to handling case where all attributes of a subdir are
added independently via sysfs_add_file.

Usecase - iio_chan_spec device registration sometimes creates all the
elements of a subdirectory (e.g. scan_elements) rather than adding
them to an existing subdirectory. Right now the core provides 'dummy'
groups for this purpose, but that's uggly.

Signed-off-by: Jonathan Cameron <jic23@....ac.uk>
---
 fs/sysfs/group.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/fs/sysfs/group.c b/fs/sysfs/group.c
index 65d6d78..25fe548 100644
--- a/fs/sysfs/group.c
+++ b/fs/sysfs/group.c
@@ -22,6 +22,8 @@ static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
 	struct attribute *const* attr;
 	int i;

+	if (grp->attrs == NULL)
+		return;
 	for (i = 0, attr = grp->attrs; *attr; i++, attr++)
 		sysfs_hash_and_remove(dir_sd, NULL, (*attr)->name);
 }
@@ -32,6 +34,8 @@ static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
 	struct attribute *const* attr;
 	int error = 0, i;

+	if (grp->attrs == NULL)
+		return 0;
 	for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
 		mode_t mode = 0;

-- 
1.7.3.4

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