linux-kernel - Re: [PATCH v3] ipmi:bt-bmc: Fix error handling and status check

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Date:   Tue, 5 May 2020 06:49:07 -0500
From:   Corey Minyard <minyard@....org>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     arnd@...db.de, gregkh@...uxfoundation.org,
        openipmi-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        Shengju Zhang <zhangshengju@...s.chinamobile.com>
Subject: Re: [PATCH v3] ipmi:bt-bmc: Fix error handling and status check

On Tue, May 05, 2020 at 06:29:06PM +0800, Tang Bin wrote:
> If the function platform_get_irq() failed, the negative value
> returned will not be detected here. So fix error handling in
> bt_bmc_config_irq(). And in the function bt_bmc_probe(),
> when get irq failed, it will print error message. So use
> platform_get_irq_optional() to simplify code. Finally in the
> function bt_bmc_remove() should make the right status check
> if get irq failed.

Ok, this is included in my tree.

Thanks,

-corey

> 
> Signed-off-by: Shengju Zhang <zhangshengju@...s.chinamobile.com>
> Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> ---
> Changes from v2
>  - fix the commit message and the code of status check
> Changes from v1
>  - fix the code of status check
> ---
>  drivers/char/ipmi/bt-bmc.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/char/ipmi/bt-bmc.c b/drivers/char/ipmi/bt-bmc.c
> index d36aeacb2..88ee54767 100644
> --- a/drivers/char/ipmi/bt-bmc.c
> +++ b/drivers/char/ipmi/bt-bmc.c
> @@ -399,9 +399,9 @@ static int bt_bmc_config_irq(struct bt_bmc *bt_bmc,
>  	struct device *dev = &pdev->dev;
>  	int rc;
>  
> -	bt_bmc->irq = platform_get_irq(pdev, 0);
> -	if (!bt_bmc->irq)
> -		return -ENODEV;
> +	bt_bmc->irq = platform_get_irq_optional(pdev, 0);
> +	if (bt_bmc->irq < 0)
> +		return bt_bmc->irq;
>  
>  	rc = devm_request_irq(dev, bt_bmc->irq, bt_bmc_irq, IRQF_SHARED,
>  			      DEVICE_NAME, bt_bmc);
> @@ -477,7 +477,7 @@ static int bt_bmc_probe(struct platform_device *pdev)
>  
>  	bt_bmc_config_irq(bt_bmc, pdev);
>  
> -	if (bt_bmc->irq) {
> +	if (bt_bmc->irq >= 0) {
>  		dev_info(dev, "Using IRQ %d\n", bt_bmc->irq);
>  	} else {
>  		dev_info(dev, "No IRQ; using timer\n");
> @@ -503,7 +503,7 @@ static int bt_bmc_remove(struct platform_device *pdev)
>  	struct bt_bmc *bt_bmc = dev_get_drvdata(&pdev->dev);
>  
>  	misc_deregister(&bt_bmc->miscdev);
> -	if (!bt_bmc->irq)
> +	if (bt_bmc->irq < 0)
>  		del_timer_sync(&bt_bmc->poll_timer);
>  	return 0;
>  }
> -- 
> 2.20.1.windows.1
> 
> 
>