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authorChristoph Hellwig <hch@lst.de>2021-09-13 07:41:14 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-09-14 17:03:01 +0200
commit820879ee1865f7010ec3a949322f643f008c9feb (patch)
tree59e97ff1ee770f7b4367eea6a30dac69941bdf0f /fs/sysfs
parentsysfs: refactor sysfs_add_file_mode_ns (diff)
downloadlinux-820879ee1865f7010ec3a949322f643f008c9feb.tar.xz
linux-820879ee1865f7010ec3a949322f643f008c9feb.zip
sysfs: simplify sysfs_kf_seq_show
Contrary to the comment ->show is never called from lseek for sysfs, given that sysfs does not use seq_lseek. So remove the NULL ->show case and just WARN and return an error if some future code path ends up here. Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20210913054121.616001-7-hch@lst.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/sysfs')
-rw-r--r--fs/sysfs/file.c15
1 files changed, 6 insertions, 9 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 74a2a8021c8b..42dcf96881b6 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -45,6 +45,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
ssize_t count;
char *buf;
+ if (WARN_ON_ONCE(!ops->show))
+ return -EINVAL;
+
/* acquire buffer and ensure that it's >= PAGE_SIZE and clear */
count = seq_get_buf(sf, &buf);
if (count < PAGE_SIZE) {
@@ -53,15 +56,9 @@ static int sysfs_kf_seq_show(struct seq_file *sf, void *v)
}
memset(buf, 0, PAGE_SIZE);
- /*
- * Invoke show(). Control may reach here via seq file lseek even
- * if @ops->show() isn't implemented.
- */
- if (ops->show) {
- count = ops->show(kobj, of->kn->priv, buf);
- if (count < 0)
- return count;
- }
+ count = ops->show(kobj, of->kn->priv, buf);
+ if (count < 0)
+ return count;
/*
* The code works fine with PAGE_SIZE return but it's likely to