linux-kernel - [PATCH 01/12] nvmem: imx-iim: use stack for nvmem

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Date:   Mon,  9 Oct 2017 15:26:30 +0200
From:   srinivas.kandagatla@...aro.org
To:     gregkh@...uxfoundation.org
Cc:     linux-kernel@...r.kernel.org, srinivas.kandagatla@...aro.org,
        Masahiro Yamada <yamada.masahiro@...ionext.com>
Subject: [PATCH 01/12] nvmem: imx-iim: use stack for nvmem_config instead of malloc'ing it

From: Masahiro Yamada <yamada.masahiro@...ionext.com>

nvmem_register() copies all the members of nvmem_config to
nvmem_device.  So, nvmem_config is one-time use data during
probing.  There is no point to keep it until the driver detach.
Using stack should be no problem because nvmem_config is pretty
small.

Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
---
 drivers/nvmem/imx-iim.c | 27 ++++++++++++---------------
 1 file changed, 12 insertions(+), 15 deletions(-)

diff --git a/drivers/nvmem/imx-iim.c b/drivers/nvmem/imx-iim.c
index 52ff65e0673f..a5992602709a 100644
--- a/drivers/nvmem/imx-iim.c
+++ b/drivers/nvmem/imx-iim.c
@@ -34,7 +34,6 @@ struct imx_iim_drvdata {
 struct iim_priv {
 	void __iomem *base;
 	struct clk *clk;
-	struct nvmem_config nvmem;
 };
 
 static int imx_iim_read(void *context, unsigned int offset,
@@ -108,7 +107,7 @@ static int imx_iim_probe(struct platform_device *pdev)
 	struct resource *res;
 	struct iim_priv *iim;
 	struct nvmem_device *nvmem;
-	struct nvmem_config *cfg;
+	struct nvmem_config cfg = {};
 	const struct imx_iim_drvdata *drvdata = NULL;
 
 	iim = devm_kzalloc(dev, sizeof(*iim), GFP_KERNEL);
@@ -130,19 +129,17 @@ static int imx_iim_probe(struct platform_device *pdev)
 	if (IS_ERR(iim->clk))
 		return PTR_ERR(iim->clk);
 
-	cfg = &iim->nvmem;
-
-	cfg->name = "imx-iim",
-	cfg->read_only = true,
-	cfg->word_size = 1,
-	cfg->stride = 1,
-	cfg->owner = THIS_MODULE,
-	cfg->reg_read = imx_iim_read,
-	cfg->dev = dev;
-	cfg->size = drvdata->nregs;
-	cfg->priv = iim;
-
-	nvmem = nvmem_register(cfg);
+	cfg.name = "imx-iim",
+	cfg.read_only = true,
+	cfg.word_size = 1,
+	cfg.stride = 1,
+	cfg.owner = THIS_MODULE,
+	cfg.reg_read = imx_iim_read,
+	cfg.dev = dev;
+	cfg.size = drvdata->nregs;
+	cfg.priv = iim;
+
+	nvmem = nvmem_register(&cfg);
 	if (IS_ERR(nvmem))
 		return PTR_ERR(nvmem);
 
-- 
2.11.0