linux-kernel - Re: [PATCH] sound: pci: emu10k1: Remove useless casting in emufx.c

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Date:	Wed, 16 Oct 2013 19:15:48 -0300
From:	Geyslan Gregório Bem <geyslan@...il.com>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	kernel-br <kernel-br@...glegroups.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Bill Pemberton <wfp5p@...ginia.edu>,
	"moderated list:SOUND" <alsa-devel@...a-project.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sound: pci: emu10k1: Remove useless casting in emufx.c

2013/10/16 Geyslan Gregório Bem <geyslan@...il.com>:
> 2013/10/16 Takashi Iwai <tiwai@...e.de>:
>> At Wed, 16 Oct 2013 13:21:45 -0300,
>> Geyslan G. Bem wrote:
>>>
>>> Casting (void *) value returned by kcalloc is useless
>>> as mentioned in Documentation/CodingStyle, Chap 14.
>>>
>>> Signed-off-by: Geyslan G. Bem <geyslan@...il.com>
>>
>> You missed __user prefix.  You can't cast user and kernel pointers
>> implicitly.
>>
>>
>> Takashi
>>
>
> Takashi,
>
> My mistake, I'll fix that later.
>
> Thank you.

I sent a substitute patch:
[PATCH] sound: pci: emu10k1: code refactoring and casting removal

Thank you.

>
>>> ---
>>>  sound/pci/emu10k1/emufx.c | 12 +++++-------
>>>  1 file changed, 5 insertions(+), 7 deletions(-)
>>>
>>> diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
>>> index 0275209..3f51dac 100644
>>> --- a/sound/pci/emu10k1/emufx.c
>>> +++ b/sound/pci/emu10k1/emufx.c
>>> @@ -1183,9 +1183,8 @@ static int _snd_emu10k1_audigy_init_efx(struct snd_emu10k1 *emu)
>>>       mm_segment_t seg;
>>>
>>>       if ((icode = kzalloc(sizeof(*icode), GFP_KERNEL)) == NULL ||
>>> -         (icode->gpr_map = (u_int32_t __user *)
>>> -          kcalloc(512 + 256 + 256 + 2 * 1024, sizeof(u_int32_t),
>>> -                  GFP_KERNEL)) == NULL ||
>>> +         (icode->gpr_map = kcalloc(512 + 256 + 256 + 2 * 1024, sizeof(u_int32_t),
>>> +                                   GFP_KERNEL)) == NULL ||
>>>           (controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
>>>                               sizeof(*controls), GFP_KERNEL)) == NULL) {
>>>               err = -ENOMEM;
>>> @@ -1815,10 +1814,9 @@ static int _snd_emu10k1_init_efx(struct snd_emu10k1 *emu)
>>>
>>>       if ((icode = kzalloc(sizeof(*icode), GFP_KERNEL)) == NULL)
>>>               return -ENOMEM;
>>> -     if ((icode->gpr_map = (u_int32_t __user *)
>>> -          kcalloc(256 + 160 + 160 + 2 * 512, sizeof(u_int32_t),
>>> -                  GFP_KERNEL)) == NULL ||
>>> -            (controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
>>> +     if ((icode->gpr_map = kcalloc(256 + 160 + 160 + 2 * 512, sizeof(u_int32_t),
>>> +                                   GFP_KERNEL)) == NULL ||
>>> +         (controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
>>>                               sizeof(struct snd_emu10k1_fx8010_control_gpr),
>>>                               GFP_KERNEL)) == NULL ||
>>>           (ipcm = kzalloc(sizeof(*ipcm), GFP_KERNEL)) == NULL) {
>>> --
>>> 1.8.4
>>>
--
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