linux-kernel - Re: [PATCH] mmc: wmt-sdmmc: fix unmatched release_mem

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Message-ID: <547503EA.3030907@coldplug.net>
Date:	Tue, 25 Nov 2014 23:34:18 +0100
From:	lautriv <lautriv@...dplug.net>
To:	Ulf Hansson <ulf.hansson@...aro.org>
CC:	Alexey Charkov <alchark@...il.com>,
	Fabio Estevam <festevam@...il.com>,
	Tony Prisk <linux@...sktech.co.nz>,
	Chris Ball <chris@...ntf.net>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mmc: wmt-sdmmc: fix unmatched release_mem_region

On 11/24/2014 09:34 AM, Ulf Hansson wrote:
> On 20 November 2014 at 15:45, lautriv <lautriv@...dplug.net> wrote:
>> From b0509e27e33326e6dccd67d8ebe67e2bdb0cfdde Mon Sep 17 00:00:00 2001
>> From: Helmut Stengele <lautriv@...dplug.net>
>> Date: Thu, 20 Nov 2014 15:27:40 +0100
>> Subject: [PATCH] mmc: wmt-sdmmc: fix unmatched release_mem_region
>>
>> Current code calls release_mem_region upon module unload
>> without requesting the region first. This patch fixes it
>> by moving to a devres-based ioremap implementation, which
>> handles requesting and releasing memory region internally.
>>
>> This also makes the error/unload paths a bit simpler.
>>
>> Signed-off-by: Helmut Stengele <lautriv@...dplug.net>
>> ---
>>
>> This is a corrected patch based on the one Alexey sent for me.
>> I sent it already but since i'm not used to send something upstream
>> it was an attached file and obviously rejected.
>> Patch is tested on bare-metal ( wm8850 ) and works like suspected.
>>
>>  drivers/mmc/host/wmt-sdmmc.c | 14 +++++---------
>>  1 file changed, 5 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/mmc/host/wmt-sdmmc.c b/drivers/mmc/host/wmt-sdmmc.c
>> index 54181b4..bcaa0cc 100644
>> --- a/drivers/mmc/host/wmt-sdmmc.c
>> +++ b/drivers/mmc/host/wmt-sdmmc.c
>> @@ -759,6 +759,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
>>      const struct wmt_mci_caps *wmt_caps;
>>      int ret;
>>      int regular_irq, dma_irq;
>> +    struct resource *res;
>>
>>      if (!of_id || !of_id->data) {
>>          dev_err(&pdev->dev, "Controller capabilities data missing\n");
>> @@ -813,10 +814,11 @@ static int wmt_mci_probe(struct platform_device *pdev)
>>      if (of_get_property(np, "cd-inverted", NULL))
>>          priv->cd_inverted = 1;
>>
>> -    priv->sdmmc_base = of_iomap(np, 0);
>> +    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> +    priv->sdmmc_base = devm_ioremap_resource(&pdev->dev, res);
> You should check the return value from devm_ioremap_resource() with IS_ERR().
>
>>      if (!priv->sdmmc_base) {
>>          dev_err(&pdev->dev, "Failed to map IO space\n");
> This print can be removed, devm_ioremap_resource() handles that.
>
>> -        ret = -ENOMEM;
>> +        ret = PTR_ERR(priv->sdmmc_base);
>>          goto fail2;
>>      }
>>
>> @@ -826,7 +828,7 @@ static int wmt_mci_probe(struct platform_device *pdev)
>>      ret = request_irq(regular_irq, wmt_mci_regular_isr, 0, "sdmmc", priv);
>>      if (ret) {
>>          dev_err(&pdev->dev, "Register regular IRQ fail\n");
>> -        goto fail3;
>> +        goto fail2;
>>      }
>>
>>      ret = request_irq(dma_irq, wmt_mci_dma_isr, 0, "sdmmc", priv);
>> @@ -869,8 +871,6 @@ fail5:
>>      free_irq(dma_irq, priv);
>>  fail4:
>>      free_irq(regular_irq, priv);
>> -fail3:
>> -    iounmap(priv->sdmmc_base);
>>  fail2:
>>      mmc_free_host(mmc);
>>  fail1:
>> @@ -881,7 +881,6 @@ static int wmt_mci_remove(struct platform_device *pdev)
>>  {
>>      struct mmc_host *mmc;
>>      struct wmt_mci_priv *priv;
>> -    struct resource *res;
>>      u32 reg_tmp;
>>
>>      mmc = platform_get_drvdata(pdev);
>> @@ -909,9 +908,6 @@ static int wmt_mci_remove(struct platform_device *pdev)
>>      clk_disable_unprepare(priv->clk_sdmmc);
>>      clk_put(priv->clk_sdmmc);
>>
>> -    res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> -    release_mem_region(res->start, resource_size(res));
>> -
>>      mmc_free_host(mmc);
>>
>>      dev_info(&pdev->dev, "WMT MCI device removed\n");
>> --
>> 2.1.3
>>
>>
> Kind regards
> Uffe
>
Thanks for the hint, will do so. ( Sent the wrong patch by accident anyway )
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