[PATCH v2] ARM: pxa: ssp: remove unnessary free for devm_xxx

Firo Yang
2015-06-08T08:23:21Z

On Mon, Jun 08, 2015 at 10:21:41AM +0200, Julia Lawall wrote:
>On Mon, 8 Jun 2015, Firo Yang wrote:
>
>> On Mon, Jun 08, 2015 at 10:09:31AM +0200, Julia Lawall wrote:
>> >On Mon, 8 Jun 2015, Firo Yang wrote:
>> >
>> >> A Coccinelle warning.
>> >> It's not necessary to free memory allocated with devm_xxx
>> >> and using these free functions maybe lead to a double free that
>> >> will corrupt the resource subsys. So, I just remove them.
>> >>
>> >> By the way, I replace devm_request_mem_region and devm_ioremap with
>> >> devm_ioremap_resource as Julia's suggestion.
>> >
>> >I think they should be done separately. The first patch fixes a bug. The
>> >second one just simplifies/modernizes the code.
>>
>> Ok, I will send another patch with simplified code separately.
>> But, what about this patch? Will it be discared?
>
>Maybe you can put a comment under the --- explaining the situation.

Sorry, --- stands for what?
>
>julia
>
>>
>> >
>> >julia
>> >
>> >>
>> >> Signed-off-by: Firo Yang <firogm@gmail.com>
>> >> ---
>> >> arch/arm/plat-pxa/ssp.c | 24 +++---------------------
>> >> 1 file changed, 3 insertions(+), 21 deletions(-)
>> >>
>> >> diff --git a/arch/arm/plat-pxa/ssp.c b/arch/arm/plat-pxa/ssp.c
>> >> index ad9529c..a278ea0 100644
>> >> --- a/arch/arm/plat-pxa/ssp.c
>> >> +++ b/arch/arm/plat-pxa/ssp.c
>> >> @@ -182,21 +182,12 @@ static int pxa_ssp_probe(struct platform_device *pdev)
>> >> return -ENODEV;
>> >> }
>> >>
>> >> - res = devm_request_mem_region(dev, res->start, resource_size(res),
>> >> - pdev->name);
>> >> - if (res == NULL) {
>> >> - dev_err(dev, "failed to request memory resource\n");
>> >> - return -EBUSY;
>> >> - }
>> >> + ssp->mmio_base = devm_ioremap_resource(dev, res);
>> >> + if (IS_ERR(ssp->mmio_base))
>> >> + return PTR_ERR(ssp->mmio_base);
>> >>
>> >> ssp->phys_base = res->start;
>> >>
>> >> - ssp->mmio_base = devm_ioremap(dev, res->start, resource_size(res));
>> >> - if (ssp->mmio_base == NULL) {
>> >> - dev_err(dev, "failed to ioremap() registers\n");
>> >> - return -ENODEV;
>> >> - }
>> >> -
>> >> ssp->irq = platform_get_irq(pdev, 0);
>> >> if (ssp->irq < 0) {
>> >> dev_err(dev, "no IRQ resource defined\n");
>> >> @@ -232,25 +223,16 @@ static int pxa_ssp_probe(struct platform_device *pdev)
>> >>
>> >> static int pxa_ssp_remove(struct platform_device *pdev)
>> >> {
>> >> - struct resource *res;
>> >> struct ssp_device *ssp;
>> >>
>> >> ssp = platform_get_drvdata(pdev);
>> >> if (ssp == NULL)
>> >> return -ENODEV;
>> >>
>> >> - iounmap(ssp->mmio_base);
>> >> -
>> >> - res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> >> - release_mem_region(res->start, resource_size(res));
>> >> -
>> >> - clk_put(ssp->clk);
>> >> -
>> >> mutex_lock(&ssp_lock);
>> >> list_del(&ssp->node);
>> >> mutex_unlock(&ssp_lock);
>> >>
>> >> - kfree(ssp);
>> >> return 0;
>> >> }
>> >>
>> >> --
>> >> 2.4.2
>> >>
>> >> --
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>> >>
>>
>> --
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