6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Saravana Kannan <saravanak@xxxxxxxxxx> commit 7fddac12c38237252431d5b8af7b6d5771b6d125 upstream. device_link_flag_is_sync_state_only() correctly returns true on the flags of an existing device link that only implements sync_state() functionality. However, it incorrectly and confusingly returns false if it's called with DL_FLAG_SYNC_STATE_ONLY. This bug doesn't manifest in any of the existing calls to this function, but fix this confusing behavior to avoid future bugs. Fixes: 67cad5c67019 ("driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links") Signed-off-by: Saravana Kannan <saravanak@xxxxxxxxxx> Tested-by: Xu Yang <xu.yang_2@xxxxxxx> Link: https://lore.kernel.org/r/20240202095636.868578-2-saravanak@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- drivers/base/core.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -283,10 +283,12 @@ static bool device_is_ancestor(struct de return false; } +#define DL_MARKER_FLAGS (DL_FLAG_INFERRED | \ + DL_FLAG_CYCLE | \ + DL_FLAG_MANAGED) static inline bool device_link_flag_is_sync_state_only(u32 flags) { - return (flags & ~(DL_FLAG_INFERRED | DL_FLAG_CYCLE)) == - (DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED); + return (flags & ~DL_MARKER_FLAGS) == DL_FLAG_SYNC_STATE_ONLY; } /**