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

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Date:	Wed, 16 Oct 2013 13:42:58 -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 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.

>> ---
>>  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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