ALSA: emu10k1: Stop using iommu_present()

iommu_get_domain_for_dev() is already perfectly happy to return NULL
if the given device has no IOMMU. Drop the unnecessary check in favour
of just handling that condition appropriately.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Link: https://lore.kernel.org/r/9b506b4a4fe8a7f40aa8bad1aafc82426cf3dd92.1649165210.git.robin.murphy@arm.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/emu10k1/emu10k1_main.c b/sound/pci/emu10k1/emu10k1_main.c
index 86cc1ca..3880f35 100644 (file)
--- a/sound/pci/emu10k1/emu10k1_main.c
+++ b/sound/pci/emu10k1/emu10k1_main.c
@@ -1751,11 +1751,8 @@ static void snd_emu10k1_detect_iommu(struct snd_emu10k1 *emu)
 
        emu->iommu_workaround = false;
 
-       if (!iommu_present(emu->card->dev->bus))
-               return;
-
        domain = iommu_get_domain_for_dev(emu->card->dev);
-       if (domain && domain->type == IOMMU_DOMAIN_IDENTITY)
+       if (!domain || domain->type == IOMMU_DOMAIN_IDENTITY)
                return;
 
        dev_notice(emu->card->dev,