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[PATCH 1/2] devm: add helper devm_add_action_or_reset()

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  [PATCH 1/2] devm: add helper devm_add_action_or_reset() Sudip Mukherjee <sudipm.mukherjee@gmail.com> - 2015-12-23 13:30 +0100
    [PATCH v2 2/2] clk: qcom: common: check for failure Sudip Mukherjee <sudipm.mukherjee@gmail.com> - 2015-12-23 13:30 +0100

#1297413 — [PATCH 1/2] devm: add helper devm_add_action_or_reset()

Add a helper function devm_add_action_or_reset() which will internally
call devm_add_action(). But if devm_add_action() fails then it will
execute the action mentioned and return the error code.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

Next patch of the series will use this helper. And from a first glance
more use of this helper will be there.

 include/linux/device.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/device.h b/include/linux/device.h
index f627ba2..f2455d0 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -682,6 +682,18 @@ void __iomem *devm_ioremap_resource(struct device *dev, struct resource *res);
 int devm_add_action(struct device *dev, void (*action)(void *), void *data);
 void devm_remove_action(struct device *dev, void (*action)(void *), void *data);
 
+static inline int devm_add_action_or_reset(struct device *dev,
+					   void (*action)(void *), void *data)
+{
+	int ret;
+
+	ret = devm_add_action(dev, action, data);
+	if (ret)
+		action(data);
+
+	return ret;
+}
+
 struct device_dma_parameters {
 	/*
 	 * a low level driver may set these to teach IOMMU code about
-- 
1.9.1

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#1297419 — [PATCH v2 2/2] clk: qcom: common: check for failure

We were not checking the return from devm_add_action() which can fail.
Start using the helper and devm_add_action_or_reset() and return
directly as we know that the cleanup has been done by this helper.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
---

v2: added the helper in patch 1/2 and used that helper here.

 drivers/clk/qcom/common.c | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
index c112eba..65809f1 100644
--- a/drivers/clk/qcom/common.c
+++ b/drivers/clk/qcom/common.c
@@ -213,7 +213,11 @@ int qcom_cc_really_probe(struct platform_device *pdev,
 	if (ret)
 		return ret;
 
-	devm_add_action(dev, qcom_cc_del_clk_provider, pdev->dev.of_node);
+	ret = devm_add_action_or_reset(dev, qcom_cc_del_clk_provider,
+				       pdev->dev.of_node);
+
+	if (ret)
+		return ret;
 
 	reset = &cc->reset;
 	reset->rcdev.of_node = dev->of_node;
@@ -227,7 +231,11 @@ int qcom_cc_really_probe(struct platform_device *pdev,
 	if (ret)
 		return ret;
 
-	devm_add_action(dev, qcom_cc_reset_unregister, &reset->rcdev);
+	ret = devm_add_action_or_reset(dev, qcom_cc_reset_unregister,
+				       &reset->rcdev);
+
+	if (ret)
+		return ret;
 
 	if (desc->gdscs && desc->num_gdscs) {
 		ret = gdsc_register(dev, desc->gdscs, desc->num_gdscs,
@@ -236,10 +244,7 @@ int qcom_cc_really_probe(struct platform_device *pdev,
 			return ret;
 	}
 
-	devm_add_action(dev, qcom_cc_gdsc_unregister, dev);
-
-
-	return 0;
+	return devm_add_action_or_reset(dev, qcom_cc_gdsc_unregister, dev);
 }
 EXPORT_SYMBOL_GPL(qcom_cc_really_probe);
 
-- 
1.9.1

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