linux-kernel - Re: [PATCH] ALSA: core: Remove unused copy_from_user

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Message-ID: <87o73rm29d.wl-tiwai@suse.de>
Date: Fri, 11 Oct 2024 11:12:46 +0200
From: Takashi Iwai <tiwai@...e.de>
To: linux@...blig.org
Cc: perex@...ex.cz,
	tiwai@...e.com,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ALSA: core: Remove unused copy_from_user_toio

On Thu, 10 Oct 2024 22:53:40 +0200,
linux@...blig.org wrote:
> 
> From: "Dr. David Alan Gilbert" <linux@...blig.org>
> 
> copy_from_user_toio() has been unused since commit
> ce2d8ed8d809 ("ASoC: qcom: Convert to generic PCM copy ops")
> 
> Remove it.

It's a pair of copy_to_*(), so if any, it should be dropped only after
both users are gone.


thanks,

Takashi

> 
> Signed-off-by: Dr. David Alan Gilbert <linux@...blig.org>
> ---
>  include/sound/core.h |  1 -
>  sound/core/memory.c  | 20 --------------------
>  2 files changed, 21 deletions(-)
> 
> diff --git a/include/sound/core.h b/include/sound/core.h
> index 1f3f5dccd736..b5a6f3d2bff5 100644
> --- a/include/sound/core.h
> +++ b/include/sound/core.h
> @@ -267,7 +267,6 @@ static inline int snd_minor_info_oss_init(void) { return 0; }
>  /* memory.c */
>  
>  int copy_to_user_fromio(void __user *dst, const volatile void __iomem *src, size_t count);
> -int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count);
>  
>  /* init.c */
>  
> diff --git a/sound/core/memory.c b/sound/core/memory.c
> index 2d2d0094c897..8222a851da87 100644
> --- a/sound/core/memory.c
> +++ b/sound/core/memory.c
> @@ -63,26 +63,6 @@ int copy_to_iter_fromio(struct iov_iter *dst, const void __iomem *src,
>  }
>  EXPORT_SYMBOL(copy_to_iter_fromio);
>  
> -/**
> - * copy_from_user_toio - copy data from user-space to mmio-space
> - * @dst: the destination pointer on mmio-space
> - * @src: the source pointer on user-space
> - * @count: the data size to copy in bytes
> - *
> - * Copies the data from user-space to mmio-space.
> - *
> - * Return: Zero if successful, or non-zero on failure.
> - */
> -int copy_from_user_toio(volatile void __iomem *dst, const void __user *src, size_t count)
> -{
> -	struct iov_iter iter;
> -
> -	if (import_ubuf(ITER_SOURCE, (void __user *)src, count, &iter))
> -		return -EFAULT;
> -	return copy_from_iter_toio((void __iomem *)dst, &iter, count);
> -}
> -EXPORT_SYMBOL(copy_from_user_toio);
> -
>  /**
>   * copy_from_iter_toio - copy data from iov_iter to mmio-space
>   * @dst: the destination pointer on mmio-space
> -- 
> 2.47.0
>