clk: fix some determine_rate implementations

Some determine_rate implementations are not returning an error
when they failed to adapt the rate according to the rate request.
Fix them so that they return an error instead of silently
returning 0.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
CC: Jonathan Corbet <corbet@lwn.net>
CC: Tony Lindgren <tony@atomide.com>
CC: Ralf Baechle <ralf@linux-mips.org>
CC: "Emilio López" <emilio@elopez.com.ar>
CC: Maxime Ripard <maxime.ripard@free-electrons.com>
Cc: Tero Kristo <t-kristo@ti.com>
CC: Peter De Schrijver <pdeschrijver@nvidia.com>
CC: Prashant Gaikwad <pgaikwad@nvidia.com>
CC: Stephen Warren <swarren@wwwdotorg.org>
CC: Thierry Reding <thierry.reding@gmail.com>
CC: Alexandre Courbot <gnurou@gmail.com>
CC: linux-doc@vger.kernel.org
CC: linux-kernel@vger.kernel.org
CC: linux-arm-kernel@lists.infradead.org
CC: linux-omap@vger.kernel.org
CC: linux-mips@linux-mips.org
CC: linux-tegra@vger.kernel.org
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/clk/mmp/clk-mix.c b/drivers/clk/mmp/clk-mix.c
index 7a37432761f9..665cb6794639 100644
--- a/drivers/clk/mmp/clk-mix.c
+++ b/drivers/clk/mmp/clk-mix.c
@@ -218,7 +218,7 @@ static int mmp_clk_mix_determine_rate(struct clk_hw *hw,
 	parent = NULL;
 	mix_rate_best = 0;
 	parent_rate_best = 0;
-	gap_best = req->rate;
+	gap_best = ULONG_MAX;
 	parent_best = NULL;
 
 	if (mix->table) {
@@ -262,6 +262,9 @@ static int mmp_clk_mix_determine_rate(struct clk_hw *hw,
 	}
 
 found:
+	if (!parent_best)
+		return -EINVAL;
+
 	req->best_parent_rate = parent_rate_best;
 	req->best_parent_hw = __clk_get_hw(parent_best);
 	req->rate = mix_rate_best;