linux-kernel - Re: [PATCH] staging: emxx_udc: Fix incorrectly defined global

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Message-ID: <YB+lVey4DAXxEPmF@kroah.com>
Date:   Sun, 7 Feb 2021 09:31:17 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Kumar Kartikeya Dwivedi <memxor@...il.com>
Cc:     devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Stephen Rothwell <sfr@...b.auug.org.au>
Subject: Re: [PATCH] staging: emxx_udc: Fix incorrectly defined global

On Sun, Feb 07, 2021 at 05:30:31AM +0530, Kumar Kartikeya Dwivedi wrote:
> The global gpio_desc pointer and int were defined in the header,
> instead put the definitions in the translation unit and add an extern
> declaration for consumers of the header (currently only one, which is
> perhaps why the linker didn't complain about symbol collisions).
> 
> This fixes sparse related warnings for this driver:
> drivers/staging/emxx_udc/emxx_udc.c: note: in included file:
> drivers/staging/emxx_udc/emxx_udc.h:23:18: warning: symbol 'vbus_gpio' was not declared. Should it be static?
> drivers/staging/emxx_udc/emxx_udc.h:24:5: warning: symbol 'vbus_irq' was not declared. Should it be static?
> 
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@...il.com>
> ---
>  drivers/staging/emxx_udc/emxx_udc.c | 3 +++
>  drivers/staging/emxx_udc/emxx_udc.h | 4 ++--
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/emxx_udc/emxx_udc.c b/drivers/staging/emxx_udc/emxx_udc.c
> index a30b4f5b1..6983c3e31 100644
> --- a/drivers/staging/emxx_udc/emxx_udc.c
> +++ b/drivers/staging/emxx_udc/emxx_udc.c
> @@ -34,6 +34,9 @@
>  #define	DRIVER_DESC	"EMXX UDC driver"
>  #define	DMA_ADDR_INVALID	(~(dma_addr_t)0)
>  
> +struct gpio_desc *vbus_gpio;
> +int vbus_irq;

A tiny driver can not create global variables with generic names like
this, sorry.  That will polute the global namespace.

thanks,

greg k-h