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linux-sg2042
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hwrng: n2-drv - 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. The NULL assignment to np->units is removed as there is no
interaction between this field and sun4v_hvapi_unregister. Also, the
labels out_free_units and out_free are removed as they are no longer
required.

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>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Himangi Saraogi 2014-05-11 00:19:00 +05:30 committed by Herbert Xu
parent 80cd88f2f5
commit 0118a55213
1 changed files with 7 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
drivers/char/hw_random/n2-drv.c
View File

@ -632,7 +632,7 @@ static int n2rng_probe(struct platform_device *op)
multi_capable = (match->data != NULL);
n2rng_driver_version();
np = kzalloc(sizeof(*np), GFP_KERNEL);
np = devm_kzalloc(&op->dev, sizeof(*np), GFP_KERNEL);
if (!np)
goto out;
np->op = op;
@ -653,7 +653,7 @@ static int n2rng_probe(struct platform_device *op)
&np->hvapi_minor)) {
dev_err(&op->dev, "Cannot register suitable "
"HVAPI version.\n");
goto out_free;
goto out;
}
}
@ -676,15 +676,16 @@ static int n2rng_probe(struct platform_device *op)
dev_info(&op->dev, "Registered RNG HVAPI major %lu minor %lu\n",
np->hvapi_major, np->hvapi_minor);
np->units = kzalloc(sizeof(struct n2rng_unit) * np->num_units,
GFP_KERNEL);
np->units = devm_kzalloc(&op->dev,
sizeof(struct n2rng_unit) * np->num_units,
GFP_KERNEL);
err = -ENOMEM;
if (!np->units)
goto out_hvapi_unregister;
err = n2rng_init_control(np);
if (err)
goto out_free_units;
goto out_hvapi_unregister;
dev_info(&op->dev, "Found %s RNG, units: %d\n",
((np->flags & N2RNG_FLAG_MULTI) ?
@ -697,7 +698,7 @@ static int n2rng_probe(struct platform_device *op)
err = hwrng_register(&np->hwrng);
if (err)
goto out_free_units;
goto out_hvapi_unregister;
platform_set_drvdata(op, np);
@ -705,15 +706,9 @@ static int n2rng_probe(struct platform_device *op)
return 0;
out_free_units:
kfree(np->units);
np->units = NULL;
out_hvapi_unregister:
sun4v_hvapi_unregister(HV_GRP_RNG);
out_free:
kfree(np);
out:
return err;
}
@ -730,11 +725,6 @@ static int n2rng_remove(struct platform_device *op)
sun4v_hvapi_unregister(HV_GRP_RNG);
kfree(np->units);
np->units = NULL;
kfree(np);
return 0;
}