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ALSA: emu10k1: Fix possible NULL dereference

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The previous dev_err() conversion resulted in a code that may give
NULL dereference in snd_emu10k1_ptr_write().  Since it's a sanity
check, better to be replaced with a debug macro like other places in
this driver.

Fixes: 6f002b0216 ('ALSA: emu10k1: Use standard printk helpers')
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-03-05 12:13:10 +01:00
parent 4f50b41fa3
commit 4913cd6964
1 changed files with 1 additions and 4 deletions
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5
sound/pci/emu10k1/io.c
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@ -71,11 +71,8 @@ void snd_emu10k1_ptr_write(struct snd_emu10k1 *emu, unsigned int reg, unsigned i
unsigned long flags;
unsigned int mask;
if (!emu) {
dev_err(emu->card->dev, "ptr_write: emu is null!\n");
dump_stack();
if (snd_BUG_ON(!emu))
return;
}
mask = emu->audigy ? A_PTR_ADDRESS_MASK : PTR_ADDRESS_MASK;
regptr = ((reg << 16) & mask) | (chn & PTR_CHANNELNUM_MASK);