[PATCH] clk: tegra: clk-dfll: Verify regulator vsel values are valid

[Jon Hunter <jonathanh@nvidia.com>]

The regulator function, regulator_list_hardware_vsel(), may return an
negative error code on failure. The Tegra DFLL driver does not check to
see if the value returned by this function is an error. Fix this by
updating the DFLL driver to check if the value returned by
regulator_list_hardware_vsel() is an error and if an error does occur
propagate the error.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
---
 drivers/clk/tegra/clk-dfll.c | 32 ++++++++++++++++++++++++--------
 1 file changed, 24 insertions(+), 8 deletions(-)

diff --git a/drivers/clk/tegra/clk-dfll.c b/drivers/clk/tegra/clk-dfll.c
index a5f526bb0483..709fb1fe7073 100644
--- a/drivers/clk/tegra/clk-dfll.c
+++ b/drivers/clk/tegra/clk-dfll.c
@@ -672,10 +672,9 @@ static int dfll_force_output(struct tegra_dfll *td, unsigned int out_sel)
  * Load the voltage-to-PMIC register value lookup table into the DFLL
  * IP block memory. Look-up tables can be loaded at any time.
  */
-static void dfll_load_i2c_lut(struct tegra_dfll *td)
+static int dfll_load_i2c_lut(struct tegra_dfll *td)
 {
-	int i, lut_index;
-	u32 val;
+	int i, lut_index, val;
 
 	for (i = 0; i < MAX_DFLL_VOLTAGES; i++) {
 		if (i < td->lut_min)
@@ -687,10 +686,15 @@ static void dfll_load_i2c_lut(struct tegra_dfll *td)
 
 		val = regulator_list_hardware_vsel(td->vdd_reg,
 						     td->lut[lut_index]);
+		if (val < 0)
+			return val;
+
 		__raw_writel(val, td->lut_base + i * 4);
 	}
 
 	dfll_i2c_wmb(td);
+
+	return 0;
 }
 
 /**
@@ -737,9 +741,10 @@ static void dfll_init_i2c_if(struct tegra_dfll *td)
  * disable the I2C command output to the PMIC, set safe voltage and
  * output limits, and disable and clear limit interrupts.
  */
-static void dfll_init_out_if(struct tegra_dfll *td)
+static int dfll_init_out_if(struct tegra_dfll *td)
 {
 	u32 val;
+	int ret;
 
 	td->lut_min = td->lut_bottom;
 	td->lut_max = td->lut_size - 1;
@@ -773,9 +778,14 @@ static void dfll_init_out_if(struct tegra_dfll *td)
 			dfll_force_output(td, vsel);
 		}
 	} else {
-		dfll_load_i2c_lut(td);
+		ret = dfll_load_i2c_lut(td);
+		if (ret < 0)
+			return ret;
+
 		dfll_init_i2c_if(td);
 	}
+
+	return 0;
 }
 
 /*
@@ -1497,12 +1507,17 @@ static int dfll_init(struct tegra_dfll *td)
 
 	dfll_set_open_loop_config(td);
 
-	dfll_init_out_if(td);
+	ret = dfll_init_out_if(td);
 
 	pm_runtime_put_sync(td->dev);
 
+	if (ret < 0)
+		goto disable_rpm;
+
 	return 0;
 
+disable_rpm:
+	pm_runtime_disable(td->dev);
 di_err2:
 	clk_unprepare(td->soc_clk);
 di_err1:
@@ -1547,6 +1562,7 @@ EXPORT_SYMBOL(tegra_dfll_suspend);
 int tegra_dfll_resume(struct device *dev)
 {
 	struct tegra_dfll *td = dev_get_drvdata(dev);
+	int ret;
 
 	reset_control_deassert(td->dvco_rst);
 
@@ -1560,11 +1576,11 @@ int tegra_dfll_resume(struct device *dev)
 
 	dfll_set_open_loop_config(td);
 
-	dfll_init_out_if(td);
+	ret = dfll_init_out_if(td);
 
 	pm_runtime_put_sync(td->dev);
 
-	return 0;
+	return ret;
 }
 EXPORT_SYMBOL(tegra_dfll_resume);
 
-- 
2.25.1