ALSA: hwdep - Make open callback optional

Don't require the open callback as mandatory.
Now all hwdeps ops can be optional.

Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 5 insertions, 4 deletions

diff --git a/sound/core/hwdep.c b/sound/core/hwdep.c
index 195cafc5a553..a70ee7f1ed98 100644
--- a/sound/core/hwdep.c
+++ b/sound/core/hwdep.c
@@ -99,9 +99,6 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
         if (hw == NULL)
                 return -ENODEV;
 
-        if (!hw->ops.open)
-                return -ENXIO;
-
         if (!try_module_get(hw->card->module))
                 return -EFAULT;
 
@@ -113,6 +110,10 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
                         err = -EBUSY;
                         break;
                 }
+                if (!hw->ops.open) {
+                        err = 0;
+                        break;
+                }
                 err = hw->ops.open(hw, file);
                 if (err >= 0)
                         break;
@@ -151,7 +152,7 @@ static int snd_hwdep_open(struct inode *inode, struct file * file)
 
 static int snd_hwdep_release(struct inode *inode, struct file * file)
 {
-        int err = -ENXIO;
+        int err = 0;
         struct snd_hwdep *hw = file->private_data;
         struct module *mod = hw->card->module;