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SubjectRe: [PATCH v3] sound: pci: emu10k1: code refactoring and casting removal
At Thu, 17 Oct 2013 12:35:31 -0300,
Geyslan G. Bem wrote:
>
> Partially restructures _snd_emu10k1_audigy_init_efx() and
> _snd_emu10k1_init_efx() functions.
>
> Removes useless casting (void *) from value returned by kcalloc;
> see Documentation/CodingStyle, Chap 14.
>
> Signed-off-by: Geyslan G. Bem <geyslan@gmail.com>

This causes the compiler error.

sound/pci/emu10k1/emufx.c:1190:26: error: expected expression before ‘)’ token
icode->gpr_map = (__user) kcalloc(512 + 256 + 256 + 2 * 1024,

So, the straight cast only with __user isn't possible. It's a sort of
modifier (like "const"), and it must be always with the real type to
cast.

Please do the reasonable tests before submitting any patches.


thanks,

Takashi

> ---
> sound/pci/emu10k1/emufx.c | 76 ++++++++++++++++++++++++++++-------------------
> 1 file changed, 45 insertions(+), 31 deletions(-)
>
> diff --git a/sound/pci/emu10k1/emufx.c b/sound/pci/emu10k1/emufx.c
> index 0275209..6c45714 100644
> --- a/sound/pci/emu10k1/emufx.c
> +++ b/sound/pci/emu10k1/emufx.c
> @@ -1182,15 +1182,20 @@ static int _snd_emu10k1_audigy_init_efx(struct snd_emu10k1 *emu)
> u32 *gpr_map;
> 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 ||
> - (controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
> - sizeof(*controls), GFP_KERNEL)) == NULL) {
> - err = -ENOMEM;
> - goto __err;
> - }
> + err = -ENOMEM;
> + icode = kzalloc(sizeof(*icode), GFP_KERNEL);
> + if (!icode)
> + return err;
> +
> + icode->gpr_map = (__user) kcalloc(512 + 256 + 256 + 2 * 1024,
> + sizeof(u_int32_t), GFP_KERNEL);
> + if (!icode->gpr_map)
> + goto __err_gpr;
> + controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
> + sizeof(*controls), GFP_KERNEL);
> + if (!controls)
> + goto __err_ctrls;
> +
> gpr_map = (u32 __force *)icode->gpr_map;
>
> icode->tram_data_map = icode->gpr_map + 512;
> @@ -1741,12 +1746,12 @@ A_OP(icode, &ptr, iMAC0, A_GPR(var), A_GPR(var), A_GPR(vol), A_EXTIN(input))
> emu->support_tlv = 0; /* clear again */
> snd_leave_user(seg);
>
> - __err:
> +__err:
> kfree(controls);
> - if (icode != NULL) {
> - kfree((void __force *)icode->gpr_map);
> - kfree(icode);
> - }
> +__err_ctrls:
> + kfree((void __force *)icode->gpr_map);
> +__err_gpr:
> + kfree(icode);
> return err;
> }
>
> @@ -1813,18 +1818,26 @@ static int _snd_emu10k1_init_efx(struct snd_emu10k1 *emu)
> u32 *gpr_map;
> mm_segment_t seg;
>
> - 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,
> - sizeof(struct snd_emu10k1_fx8010_control_gpr),
> - GFP_KERNEL)) == NULL ||
> - (ipcm = kzalloc(sizeof(*ipcm), GFP_KERNEL)) == NULL) {
> - err = -ENOMEM;
> - goto __err;
> - }
> + err = -ENOMEM;
> + icode = kzalloc(sizeof(*icode), GFP_KERNEL);
> + if (!icode)
> + return err;
> +
> + icode->gpr_map = (__user) kcalloc(256 + 160 + 160 + 2 * 512,
> + sizeof(u_int32_t), GFP_KERNEL);
> + if (!icode->gpr_map)
> + goto __err_gpr;
> +
> + controls = kcalloc(SND_EMU10K1_GPR_CONTROLS,
> + sizeof(struct snd_emu10k1_fx8010_control_gpr),
> + GFP_KERNEL);
> + if (!controls)
> + goto __err_ctrls;
> +
> + ipcm = kzalloc(sizeof(*ipcm), GFP_KERNEL);
> + if (!ipcm)
> + goto __err_ipcm;
> +
> gpr_map = (u32 __force *)icode->gpr_map;
>
> icode->tram_data_map = icode->gpr_map + 256;
> @@ -2363,13 +2376,14 @@ static int _snd_emu10k1_init_efx(struct snd_emu10k1 *emu)
> snd_leave_user(seg);
> if (err >= 0)
> err = snd_emu10k1_ipcm_poke(emu, ipcm);
> - __err:
> +__err:
> kfree(ipcm);
> +__err_ipcm:
> kfree(controls);
> - if (icode != NULL) {
> - kfree((void __force *)icode->gpr_map);
> - kfree(icode);
> - }
> +__err_ctrls:
> + kfree((void __force *)icode->gpr_map);
> +__err_gpr:
> + kfree(icode);
> return err;
> }
>
> --
> 1.8.4
>
--
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