linux-kernel - Re: [PATCH] media: ngene: avoid unused variable warning

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Date:   Tue, 13 Mar 2018 17:38:44 +0100
From:   Daniel Scheller <d.scheller.oss@...il.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>
Cc:     Binoy Jayan <binoy.jayan@...aro.org>,
        Jasmin Jessich <jasmin@....at>, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: ngene: avoid unused variable warning

Am Tue, 13 Mar 2018 14:06:03 +0100
schrieb Arnd Bergmann <arnd@...db.de>:

> The newly added pdev variable is only used in an #ifdef, causing a
> build warning without CONFIG_PCI_MSI, unless we move the declaration
> inside the same #ifdef:
> 
> drivers/media/pci/ngene/ngene-core.c: In function 'ngene_start':
> drivers/media/pci/ngene/ngene-core.c:1328:17: error: unused variable 'pdev' [-Werror=unused-variable]
> 
> Fixes: 6795bf626482 ("media: ngene: convert kernellog printing from printk() to dev_*() macros")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Acked-by: Daniel Scheller <d.scheller@....net>

Thanks!

> ---
>  drivers/media/pci/ngene/ngene-core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/pci/ngene/ngene-core.c b/drivers/media/pci/ngene/ngene-core.c
> index 3b9a1bfaf6c0..25f16833a475 100644
> --- a/drivers/media/pci/ngene/ngene-core.c
> +++ b/drivers/media/pci/ngene/ngene-core.c
> @@ -1325,7 +1325,6 @@ static int ngene_buffer_config(struct ngene *dev)
>  
>  static int ngene_start(struct ngene *dev)
>  {
> -	struct device *pdev = &dev->pci_dev->dev;
>  	int stat;
>  	int i;
>  
> @@ -1359,6 +1358,7 @@ static int ngene_start(struct ngene *dev)
>  #ifdef CONFIG_PCI_MSI
>  	/* enable MSI if kernel and card support it */
>  	if (pci_msi_enabled() && dev->card_info->msi_supported) {
> +		struct device *pdev = &dev->pci_dev->dev;
>  		unsigned long flags;
>  
>  		ngwritel(0, NGENE_INT_ENABLE);

Best regards,
Daniel Scheller
-- 
https://github.com/herrnst