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Subject[PATCH] mtd: 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 label out_err_hw_init is done away
with and the label out_err_kzalloc is renamed to out_err.

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>
---
drivers/mtd/nand/bf5xx_nand.c | 13 ++++---------
1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/mtd/nand/bf5xx_nand.c b/drivers/mtd/nand/bf5xx_nand.c
index b7a2494..722898a 100644
--- a/drivers/mtd/nand/bf5xx_nand.c
+++ b/drivers/mtd/nand/bf5xx_nand.c
@@ -679,9 +679,6 @@ static int bf5xx_nand_remove(struct platform_device *pdev)
peripheral_free_list(bfin_nfc_pin_req);
bf5xx_nand_dma_remove(info);

- /* free the common resources */
- kfree(info);
-
return 0;
}

@@ -742,10 +739,10 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
return -EFAULT;
}

- info = kzalloc(sizeof(*info), GFP_KERNEL);
+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
if (info == NULL) {
err = -ENOMEM;
- goto out_err_kzalloc;
+ goto out_err;
}

platform_set_drvdata(pdev, info);
@@ -790,7 +787,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)
/* initialise the hardware */
err = bf5xx_nand_hw_init(info);
if (err)
- goto out_err_hw_init;
+ goto out_err;

/* setup hardware ECC data struct */
if (hardware_ecc) {
@@ -827,9 +824,7 @@ static int bf5xx_nand_probe(struct platform_device *pdev)

out_err_nand_scan:
bf5xx_nand_dma_remove(info);
-out_err_hw_init:
- kfree(info);
-out_err_kzalloc:
+out_err:
peripheral_free_list(bfin_nfc_pin_req);

return err;
--
1.9.1


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