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Date: Mon, 22 Sep 2014 21:52:19 +0530
From: Pramod Gurav <pramod.gurav@...rtplayin.com>
To: linux-kernel@...r.kernel.org, Chris Ball <chris@...ntf.net>,
Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Subject: Re: [PATCH 1/2] mmc: atmel-mci: Switch to using managed resource
in probe
On 22-09-2014 09:15 PM, Ludovic Desroches wrote:
> Hi Pramod,
>
> Thanks for taking care of device managed resources conversion. My only
> concern is about using devm_request_irq. There are several discussions
> about races which can occur when using it.
>
> Keeping request_irq and free_irq the time it takes to solve this issue
> is probably better.
Oh, Thanks for letting me know this. I will resend this patch keeping
request_irq and free_irq in driver.
>
> Regards
>
> Ludovic
>
> On Sat, Sep 20, 2014 at 12:22:30PM +0530, Pramod Gurav wrote:
>> This change uses managed resource APIs to allocate resources such as,
>> clk, gpio, irq in order to simplify the driver unload or failure cases.
>> Hence does away with release statements of the same resorces in error
>> lables and remove function.
>>
>> Cc: Ludovic Desroches <ludovic.desroches@...el.com>
>> Cc: Chris Ball <chris@...ntf.net>
>> Cc: Ulf Hansson <ulf.hansson@...aro.org>
>> Cc: linux-mmc@...r.kernel.org
>> Signed-off-by: Pramod Gurav <pramod.gurav@...rtplayin.com>
>> ---
>> drivers/mmc/host/atmel-mci.c | 57 ++++++++++++++++----------------------------
>> 1 file changed, 20 insertions(+), 37 deletions(-)
>>
>> diff --git a/drivers/mmc/host/atmel-mci.c b/drivers/mmc/host/atmel-mci.c
>> index bb585d9..21a222c 100644
>> --- a/drivers/mmc/host/atmel-mci.c
>> +++ b/drivers/mmc/host/atmel-mci.c
>> @@ -17,6 +17,7 @@
>> #include <linux/gpio.h>
>> #include <linux/init.h>
>> #include <linux/interrupt.h>
>> +#include <linux/io.h>
>> #include <linux/ioport.h>
>> #include <linux/module.h>
>> #include <linux/of.h>
>> @@ -2195,7 +2196,8 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>> /* Assume card is present initially */
>> set_bit(ATMCI_CARD_PRESENT, &slot->flags);
>> if (gpio_is_valid(slot->detect_pin)) {
>> - if (gpio_request(slot->detect_pin, "mmc_detect")) {
>> + if (devm_gpio_request(&host->pdev->dev, slot->detect_pin,
>> + "mmc_detect")) {
>> dev_dbg(&mmc->class_dev, "no detect pin available\n");
>> slot->detect_pin = -EBUSY;
>> } else if (gpio_get_value(slot->detect_pin) ^
>> @@ -2208,7 +2210,8 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>> mmc->caps |= MMC_CAP_NEEDS_POLL;
>>
>> if (gpio_is_valid(slot->wp_pin)) {
>> - if (gpio_request(slot->wp_pin, "mmc_wp")) {
>> + if (devm_gpio_request(&host->pdev->dev, slot->wp_pin,
>> + "mmc_wp")) {
>> dev_dbg(&mmc->class_dev, "no WP pin available\n");
>> slot->wp_pin = -EBUSY;
>> }
>> @@ -2224,7 +2227,8 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>> setup_timer(&slot->detect_timer, atmci_detect_change,
>> (unsigned long)slot);
>>
>> - ret = request_irq(gpio_to_irq(slot->detect_pin),
>> + ret = devm_request_irq(&host->pdev->dev,
>> + gpio_to_irq(slot->detect_pin),
>> atmci_detect_interrupt,
>> IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING,
>> "mmc-detect", slot);
>> @@ -2232,7 +2236,6 @@ static int __init atmci_init_slot(struct atmel_mci *host,
>> dev_dbg(&mmc->class_dev,
>> "could not request IRQ %d for detect pin\n",
>> gpio_to_irq(slot->detect_pin));
>> - gpio_free(slot->detect_pin);
>> slot->detect_pin = -EBUSY;
>> }
>> }
>> @@ -2252,15 +2255,8 @@ static void __exit atmci_cleanup_slot(struct atmel_mci_slot *slot,
>>
>> mmc_remove_host(slot->mmc);
>>
>> - if (gpio_is_valid(slot->detect_pin)) {
>> - int pin = slot->detect_pin;
>> -
>> - free_irq(gpio_to_irq(pin), slot);
>> + if (gpio_is_valid(slot->detect_pin))
>> del_timer_sync(&slot->detect_timer);
>> - gpio_free(pin);
>> - }
>> - if (gpio_is_valid(slot->wp_pin))
>> - gpio_free(slot->wp_pin);
>>
>> slot->host->slot[id] = NULL;
>> mmc_free_host(slot->mmc);
>> @@ -2395,7 +2391,7 @@ static int __init atmci_probe(struct platform_device *pdev)
>> if (irq < 0)
>> return irq;
>>
>> - host = kzalloc(sizeof(struct atmel_mci), GFP_KERNEL);
>> + host = devm_kzalloc(&pdev->dev, sizeof(*host), GFP_KERNEL);
>> if (!host)
>> return -ENOMEM;
>>
>> @@ -2403,20 +2399,18 @@ static int __init atmci_probe(struct platform_device *pdev)
>> spin_lock_init(&host->lock);
>> INIT_LIST_HEAD(&host->queue);
>>
>> - host->mck = clk_get(&pdev->dev, "mci_clk");
>> - if (IS_ERR(host->mck)) {
>> - ret = PTR_ERR(host->mck);
>> - goto err_clk_get;
>> - }
>> + host->mck = devm_clk_get(&pdev->dev, "mci_clk");
>> + if (IS_ERR(host->mck))
>> + return PTR_ERR(host->mck);
>>
>> - ret = -ENOMEM;
>> - host->regs = ioremap(regs->start, resource_size(regs));
>> + host->regs = devm_ioremap(&pdev->dev, regs->start, resource_size(regs));
>> if (!host->regs)
>> - goto err_ioremap;
>> + return -ENOMEM;
>>
>> ret = clk_prepare_enable(host->mck);
>> if (ret)
>> - goto err_request_irq;
>> + return ret;
>> +
>> atmci_writel(host, ATMCI_CR, ATMCI_CR_SWRST);
>> host->bus_hz = clk_get_rate(host->mck);
>> clk_disable_unprepare(host->mck);
>> @@ -2425,9 +2419,10 @@ static int __init atmci_probe(struct platform_device *pdev)
>>
>> tasklet_init(&host->tasklet, atmci_tasklet_func, (unsigned long)host);
>>
>> - ret = request_irq(irq, atmci_interrupt, 0, dev_name(&pdev->dev), host);
>> + ret = devm_request_irq(&pdev->dev, irq, atmci_interrupt, 0,
>> + dev_name(&pdev->dev), host);
>> if (ret)
>> - goto err_request_irq;
>> + return ret;
>>
>> /* Get MCI capabilities and set operations according to it */
>> atmci_get_cap(host);
>> @@ -2498,13 +2493,7 @@ static int __init atmci_probe(struct platform_device *pdev)
>> err_init_slot:
>> if (host->dma.chan)
>> dma_release_channel(host->dma.chan);
>> - free_irq(irq, host);
>> -err_request_irq:
>> - iounmap(host->regs);
>> -err_ioremap:
>> - clk_put(host->mck);
>> -err_clk_get:
>> - kfree(host);
>> +
>> return ret;
>> }
>>
>> @@ -2531,12 +2520,6 @@ static int __exit atmci_remove(struct platform_device *pdev)
>> if (host->dma.chan)
>> dma_release_channel(host->dma.chan);
>>
>> - free_irq(platform_get_irq(pdev, 0), host);
>> - iounmap(host->regs);
>> -
>> - clk_put(host->mck);
>> - kfree(host);
>> -
>> return 0;
>> }
>>
>> --
>> 1.8.3.2
>>
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