[RFC v3 06/13] ahci-platform: Add support for devices with more then 1 clock

On Sun, Jan 19, 2014 at 12:48:48AM +0100, Hans de Goede wrote:

+static int ahci_enable_clks(struct device *dev, struct ahci_host_priv *hpriv)
+{
+	int c, rc;
+
+	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++) {

	for (c = 0; c < AHCI_MAX_CLKS && !IS_ERR(hpriv->clks[c]); c++) {

+		rc = clk_prepare_enable(hpriv->clks[c]);
+		if (rc) {
+			dev_err(dev, "clock prepare enable failed");
+			goto disable_unprepare_clk;
+		}
+	}
+	return 0;
+
+disable_unprepare_clk:
+	while (--c >= 0)
+		clk_disable_unprepare(hpriv->clks[c]);
+	return rc;
+}
+
+static void ahci_disable_clks(struct ahci_host_priv *hpriv)
+{
+	int c;
+
+	for (c = AHCI_MAX_CLKS - 1; c >= 0; c--)
+		if (hpriv->clks[c])

		if (!IS_ERR(hpriv->clks[c]))

+			clk_disable_unprepare(hpriv->clks[c]);
+}
+
+static void ahci_put_clks(struct ahci_host_priv *hpriv)
+{
+	int c;
+
+	for (c = 0; c < AHCI_MAX_CLKS && hpriv->clks[c]; c++)

	for (c = 0; c < AHCI_MAX_CLKS && !IS_ERR(hpriv->clks[c]); c++)

+		clk_put(hpriv->clks[c]);
+}

Better still for this one, consider using devm_clk_get() - in which case
the above is even more important to get right.  We really should have
a devm_of_clk_get() too.

-- 
FTTC broadband for 0.8mile line: 5.8Mbps down 500kbps up.  Estimation
in database were 13.1 to 19Mbit for a good line, about 7.5+ for a bad.
Estimate before purchase was "up to 13.2Mbit".