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ALSA: cs46xx memory management fixes for cs46xx_dsp_spos_create() 

When reading through sound/pci/cs46xx/dsp_spos.c I noticed a couple of
things in cs46xx_dsp_spos_create().

It seems to me that we don't always free the various memory buffers we
allocate and we also do some work (structure member assignment) early,
that is completely pointless if some of the memory allocations fail and
we end up just aborting the whole thing.

I don't have hardware to test, so the patch below is compile tested only,
but it makes the following changes:

- Make sure we always free all allocated memory on failures.
- Don't do pointless work assigning to structure members before we know
  all memory allocations, that may abort progress, have completed
  successfully.
- Remove some trailing whitespace.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Tested-by: Ondrej Zary <linux@rainbow-software.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Jesper Juhl 2010-10-29 22:54:45 +02:00 committed by Takashi Iwai
parent 8a8d56b2a2
commit bb617ee3f8
1 changed files with 11 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
sound/pci/cs46xx/dsp_spos.c
View File

@ -225,39 +225,25 @@ struct dsp_spos_instance *cs46xx_dsp_spos_create (struct snd_cs46xx * chip)
{
struct dsp_spos_instance * ins = kzalloc(sizeof(struct dsp_spos_instance), GFP_KERNEL);
if (ins == NULL)
if (ins == NULL)
return NULL;
/* better to use vmalloc for this big table */
ins->symbol_table.nsymbols = 0;
ins->symbol_table.symbols = vmalloc(sizeof(struct dsp_symbol_entry) *
DSP_MAX_SYMBOLS);
ins->symbol_table.highest_frag_index = 0;
if (ins->symbol_table.symbols == NULL) {
ins->code.data = kmalloc(DSP_CODE_BYTE_SIZE, GFP_KERNEL);
ins->modules = kmalloc(sizeof(struct dsp_module_desc) * DSP_MAX_MODULES, GFP_KERNEL);
if (!ins->symbol_table.symbols || !ins->code.data || !ins->modules) {
cs46xx_dsp_spos_destroy(chip);
goto error;
}
ins->symbol_table.nsymbols = 0;
ins->symbol_table.highest_frag_index = 0;
ins->code.offset = 0;
ins->code.size = 0;
ins->code.data = kmalloc(DSP_CODE_BYTE_SIZE, GFP_KERNEL);
if (ins->code.data == NULL) {
cs46xx_dsp_spos_destroy(chip);
goto error;
}
ins->nscb = 0;
ins->ntask = 0;
ins->nmodules = 0;
ins->modules = kmalloc(sizeof(struct dsp_module_desc) * DSP_MAX_MODULES, GFP_KERNEL);
if (ins->modules == NULL) {
cs46xx_dsp_spos_destroy(chip);
goto error;
}
/* default SPDIF input sample rate
to 48000 khz */
@ -271,8 +257,8 @@ struct dsp_spos_instance *cs46xx_dsp_spos_create (struct snd_cs46xx * chip)
/* set left and right validity bits and
default channel status */
ins->spdif_csuv_default =
ins->spdif_csuv_stream =
ins->spdif_csuv_default =
ins->spdif_csuv_stream =
/* byte 0 */ ((unsigned int)_wrap_all_bits( (SNDRV_PCM_DEFAULT_CON_SPDIF & 0xff)) << 24) |
/* byte 1 */ ((unsigned int)_wrap_all_bits( ((SNDRV_PCM_DEFAULT_CON_SPDIF >> 8) & 0xff)) << 16) |
/* byte 3 */ (unsigned int)_wrap_all_bits( (SNDRV_PCM_DEFAULT_CON_SPDIF >> 24) & 0xff) |
@ -281,6 +267,9 @@ struct dsp_spos_instance *cs46xx_dsp_spos_create (struct snd_cs46xx * chip)
return ins;
error:
kfree(ins->modules);
kfree(ins->code.data);
vfree(ins->symbol_table.symbols);
kfree(ins);
return NULL;
}