4.16-stable review patch. If anyone has any objections, please let me know.
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From: Coly Li colyli@suse.de
commit 1c1a2ee1b53b006754073eefc65d2b2cedb5264b upstream.
Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()") returns the return value of debugfs_create_dir() to bcache_init(). When CONFIG_DEBUG_FS=n, bch_debug_init() always returns 1 and makes bcache_init() failedi.
This patch makes bch_debug_init() always returns 0 if CONFIG_DEBUG_FS=n, so bcache can continue to work for the kernels which don't have debugfs enanbled.
Changelog: v4: Add Acked-by from Kent Overstreet. v3: Use IS_ENABLED(CONFIG_DEBUG_FS) to replace #ifdef DEBUG_FS. v2: Remove a warning information v1: Initial version.
Fixes: Commit 539d39eb2708 ("bcache: fix wrong return value in bch_debug_init()") Cc: stable@vger.kernel.org Signed-off-by: Coly Li colyli@suse.de Reported-by: Massimo B. massimo.b@gmx.net Reported-by: Kai Krakow kai@kaishome.de Tested-by: Kai Krakow kai@kaishome.de Acked-by: Kent Overstreet kent.overstreet@gmail.com Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Kai Krakow kai@kaishome.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/md/bcache/debug.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/md/bcache/debug.c +++ b/drivers/md/bcache/debug.c @@ -251,6 +251,9 @@ void bch_debug_exit(void)
int __init bch_debug_init(struct kobject *kobj) { + if (!IS_ENABLED(CONFIG_DEBUG_FS)) + return 0; + debug = debugfs_create_dir("bcache", NULL);
return IS_ERR_OR_NULL(debug);