linux-kernel - [PATCH 2/6] usb: bdc: Cleanup clock support

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Date:   Thu, 20 Jun 2019 17:09:47 -0400
From:   Al Cooper <alcooperx@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Al Cooper <alcooperx@...il.com>, devicetree@...r.kernel.org,
        Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Rob Herring <robh+dt@...nel.org>
Subject: [PATCH 2/6] usb: bdc: Cleanup clock support

- Fix driver to defer on clk_get defer

Signed-off-by: Al Cooper <alcooperx@...il.com>
---
 drivers/usb/gadget/udc/bdc/bdc_core.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/gadget/udc/bdc/bdc_core.c b/drivers/usb/gadget/udc/bdc/bdc_core.c
index ccbd1d34eb2a..11a43de6c1c6 100644
--- a/drivers/usb/gadget/udc/bdc/bdc_core.c
+++ b/drivers/usb/gadget/udc/bdc/bdc_core.c
@@ -490,8 +490,14 @@ static int bdc_probe(struct platform_device *pdev)
 
 	dev_dbg(dev, "%s()\n", __func__);
 
+	bdc = devm_kzalloc(dev, sizeof(*bdc), GFP_KERNEL);
+	if (!bdc)
+		return -ENOMEM;
+
 	clk = devm_clk_get(dev, "sw_usbd");
 	if (IS_ERR(clk)) {
+		if (PTR_ERR(clk) == -EPROBE_DEFER)
+			return -EPROBE_DEFER;
 		dev_info(dev, "Clock not found in Device Tree\n");
 		clk = NULL;
 	}
@@ -501,11 +507,6 @@ static int bdc_probe(struct platform_device *pdev)
 		dev_err(dev, "could not enable clock\n");
 		return ret;
 	}
-
-	bdc = devm_kzalloc(dev, sizeof(*bdc), GFP_KERNEL);
-	if (!bdc)
-		return -ENOMEM;
-
 	bdc->clk = clk;
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@@ -551,7 +552,7 @@ static int bdc_probe(struct platform_device *pdev)
 	ret = bdc_phy_init(bdc);
 	if (ret) {
 		dev_err(bdc->dev, "BDC phy init failure:%d\n", ret);
-		return ret;
+		goto clk_cleanup;
 	}
 
 	temp = bdc_readl(bdc->regs, BDC_BDCCAP1);
@@ -583,6 +584,8 @@ static int bdc_probe(struct platform_device *pdev)
 	bdc_hw_exit(bdc);
 phycleanup:
 	bdc_phy_exit(bdc);
+clk_cleanup:
+	clk_disable_unprepare(bdc->clk);
 	return ret;
 }
 
-- 
1.9.0.138.g2de3478