From 8bcbde2bb1374112264826aa26ff959149f318e4 Mon Sep 17 00:00:00 2001 From: Douglas Anderson Date: Tue, 22 Feb 2022 15:46:00 -0800 Subject: [PATCH] debugfs: Document that debugfs_create functions need not be error checked As talked about in commit b792e64021ec ("drm: no need to check return value of debugfs_create functions"), in many cases we can get away with totally skipping checking the errors of debugfs functions. Let's document that so people don't add new code that needlessly checks these errors. Probably this note could be added to a boatload of functions, but that's a lot of duplication. Let's just add it to the two most frequent ones and hope people will get the idea. Suggested-by: Javier Martinez Canillas Reviewed-by: Javier Martinez Canillas Signed-off-by: Douglas Anderson Link: https://lore.kernel.org/r/20220222154555.1.I26d364db7a007f8995e8f0dac978673bc8e9f5e2@changeid Signed-off-by: Greg Kroah-Hartman --- fs/debugfs/inode.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c index 2f117c57160d..3dcf0b8b4e93 100644 --- a/fs/debugfs/inode.c +++ b/fs/debugfs/inode.c @@ -450,6 +450,11 @@ static struct dentry *__debugfs_create_file(const char *name, umode_t mode, * * If debugfs is not enabled in the kernel, the value -%ENODEV will be * returned. + * + * NOTE: it's expected that most callers should _ignore_ the errors returned + * by this function. Other debugfs functions handle the fact that the "dentry" + * passed to them could be an error and they don't crash in that case. + * Drivers should generally work fine even if debugfs fails to init anyway. */ struct dentry *debugfs_create_file(const char *name, umode_t mode, struct dentry *parent, void *data, @@ -551,6 +556,11 @@ EXPORT_SYMBOL_GPL(debugfs_create_file_size); * * If debugfs is not enabled in the kernel, the value -%ENODEV will be * returned. + * + * NOTE: it's expected that most callers should _ignore_ the errors returned + * by this function. Other debugfs functions handle the fact that the "dentry" + * passed to them could be an error and they don't crash in that case. + * Drivers should generally work fine even if debugfs fails to init anyway. */ struct dentry *debugfs_create_dir(const char *name, struct dentry *parent) {