linux-kernel - Re: [PATCH] ASoC: SOF: Disable pointless writes to debugfs file

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Date: Thu, 4 Apr 2024 17:50:55 +0300
From: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
To: Dan Carpenter <dan.carpenter@...aro.org>,
 Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc: Liam Girdwood <lgirdwood@...il.com>,
 Bard Liao <yung-chuan.liao@...ux.intel.com>,
 Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
 Daniel Baluta <daniel.baluta@....com>,
 Kai Vehmanen <kai.vehmanen@...ux.intel.com>, Mark Brown
 <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
 Takashi Iwai <tiwai@...e.com>, sound-open-firmware@...a-project.org,
 linux-sound@...r.kernel.org, linux-kernel@...r.kernel.org,
 kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] ASoC: SOF: Disable pointless writes to debugfs file



On 04/04/2024 10:38, Dan Carpenter wrote:
> The permissions on this debugfs file are 0444 so it can't be written to.
> And writing to the file hasn't done anything since commit 6e9548cdb30e
> ("ASoC: SOF: Convert the generic IPC flood test into SOF client").
> Delete the write function.

I agree, it is not used anymore and ...

> 
> Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>

Acked-by: Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>

> ---
> I haven't tested this patch and there is a risk that it breaks some of
> the test scripts.  Another option would be to just make it a dummy
> function that does { return count; }.  But I thought I would try the
> better option first.
> 
> Please review this extra carefully.
> 
>  sound/soc/sof/debug.c | 19 -------------------
>  1 file changed, 19 deletions(-)
> 
> diff --git a/sound/soc/sof/debug.c b/sound/soc/sof/debug.c
> index 7c8aafca8fde..937e51b02a24 100644
> --- a/sound/soc/sof/debug.c
> +++ b/sound/soc/sof/debug.c
> @@ -19,24 +19,6 @@
>  #include "sof-priv.h"
>  #include "ops.h"
>  
> -static ssize_t sof_dfsentry_write(struct file *file, const char __user *buffer,
> -				  size_t count, loff_t *ppos)
> -{
> -	size_t size;
> -	char *string;
> -	int ret;
> -
> -	string = kzalloc(count+1, GFP_KERNEL);
> -	if (!string)
> -		return -ENOMEM;
> -
> -	size = simple_write_to_buffer(string, count, ppos, buffer, count);
> -	ret = size;
> -
> -	kfree(string);

This was not too constructive ;)

> -	return ret;
> -}
> -
>  static ssize_t sof_dfsentry_read(struct file *file, char __user *buffer,
>  				 size_t count, loff_t *ppos)
>  {
> @@ -126,7 +108,6 @@ static const struct file_operations sof_dfs_fops = {
>  	.open = simple_open,
>  	.read = sof_dfsentry_read,
>  	.llseek = default_llseek,
> -	.write = sof_dfsentry_write,
>  };
>  
>  /* create FS entry for debug files that can expose DSP memories, registers */

-- 
Péter