[PATCH] clk: Reject positive return values from init callbacks

[yong.liu <binary_world@163.com>]

Clock init callbacks must return zero on success or a negative error code
on failure. If a callback returns a positive value, __clk_core_init()
already takes its failure path and __clk_register() releases the clock
before returning ERR_PTR(ret).

However, a positive value encoded by ERR_PTR() is not recognized by
IS_ERR(). Consequently, clk_register() returns an invalid pointer that
passes the caller's error check, while clk_hw_register() and
of_clk_hw_register() report success through PTR_ERR_OR_ZERO() despite
registration having failed.

Convert positive init return values to -EINVAL before taking the failure
path. This makes the registration failure detectable through the public
registration interfaces while preserving valid negative error codes.

Signed-off-by: yong.liu <binary_world@163.com>
---
 drivers/clk/clk.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
--- a/drivers/clk/clk.c
+++ b/drivers/clk/clk.c
@@ -4053,6 +4053,8 @@ static int __clk_core_init(struct clk_core *core)
 	 */
 	if (core->ops->init) {
 		ret = core->ops->init(core->hw);
+		if (ret > 0)
+			ret = -EINVAL;
 		if (ret)
 			goto out;
 	}