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Subject[PATCH] MIPS: mti-sead3: Introduce the use of the managed version of kzalloc
This patch moves data allocated using kzalloc to managed data allocated
using devm_kzalloc and cleans now unnecessary kfrees in probe and remove
functions. Also, the now unnecessary labels out_mem and out are done
away with. The error handling code is moved under if and return 0 is now
at the end of the function.

The following Coccinelle semantic patch was used for making the change:

@platform@
identifier p, probefn, removefn;
@@
struct platform_driver p = {
.probe = probefn,
.remove = removefn,
};

@prb@
identifier platform.probefn, pdev;
expression e, e1, e2;
@@
probefn(struct platform_device *pdev, ...) {
<+...
- e = kzalloc(e1, e2)
+ e = devm_kzalloc(&pdev->dev, e1, e2)
...
?-kfree(e);
...+>
}

@rem depends on prb@
identifier platform.removefn;
expression e;
@@
removefn(...) {
<...
- kfree(e);
...>
}

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
---
arch/mips/mti-sead3/sead3-pic32-i2c-drv.c | 36 +++++++++++--------------------
1 file changed, 13 insertions(+), 23 deletions(-)

diff --git a/arch/mips/mti-sead3/sead3-pic32-i2c-drv.c b/arch/mips/mti-sead3/sead3-pic32-i2c-drv.c
index b921e5e..80fe194 100644
--- a/arch/mips/mti-sead3/sead3-pic32-i2c-drv.c
+++ b/arch/mips/mti-sead3/sead3-pic32-i2c-drv.c
@@ -312,16 +312,13 @@ static int i2c_platform_probe(struct platform_device *pdev)

pr_debug("i2c_platform_probe\n");
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!r) {
- ret = -ENODEV;
- goto out;
- }
+ if (!r)
+ return -ENODEV;

- priv = kzalloc(sizeof(struct i2c_platform_data), GFP_KERNEL);
- if (!priv) {
- ret = -ENOMEM;
- goto out;
- }
+ priv = devm_kzalloc(&pdev->dev, sizeof(struct i2c_platform_data),
+ GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;

/* FIXME: need to allocate resource in PIC32 space */
#if 0
@@ -330,10 +327,8 @@ static int i2c_platform_probe(struct platform_device *pdev)
#else
priv->base = r->start;
#endif
- if (!priv->base) {
- ret = -EBUSY;
- goto out_mem;
- }
+ if (!priv->base)
+ return -EBUSY;

priv->xfer_timeout = 200;
priv->ack_timeout = 200;
@@ -348,17 +343,13 @@ static int i2c_platform_probe(struct platform_device *pdev)
i2c_platform_setup(priv);

ret = i2c_add_numbered_adapter(&priv->adap);
- if (ret == 0) {
- platform_set_drvdata(pdev, priv);
- return 0;
+ if (ret) {
+ i2c_platform_disable(priv);
+ return ret;
}

- i2c_platform_disable(priv);
-
-out_mem:
- kfree(priv);
-out:
- return ret;
+ platform_set_drvdata(pdev, priv);
+ return 0;
}

static int i2c_platform_remove(struct platform_device *pdev)
@@ -369,7 +360,6 @@ static int i2c_platform_remove(struct platform_device *pdev)
platform_set_drvdata(pdev, NULL);
i2c_del_adapter(&priv->adap);
i2c_platform_disable(priv);
- kfree(priv);
return 0;
}

--
1.9.1


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