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[ALSA] return ENODEV for disconnected devices 

Modules: ALSA Core

Add dummy functions that return -ENODEV for the struct file_operations
of a disconnected device.  Without such functions, userspace would get
ENOTTY.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
hifive-unleashed-5.1
Clemens Ladisch 2006-03-03 14:08:43 +01:00 committed by Jaroslav Kysela
parent 0b7bed4ec2
commit b3b0abe11d
1 changed files with 42 additions and 0 deletions
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42
sound/core/init.c
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@ -169,11 +169,44 @@ struct snd_card *snd_card_new(int idx, const char *xid,
return NULL;
}
static loff_t snd_disconnect_llseek(struct file *file, loff_t offset, int orig)
{
return -ENODEV;
}
static ssize_t snd_disconnect_read(struct file *file, char __user *buf,
size_t count, loff_t *offset)
{
return -ENODEV;
}
static ssize_t snd_disconnect_write(struct file *file, const char __user *buf,
size_t count, loff_t *offset)
{
return -ENODEV;
}
static unsigned int snd_disconnect_poll(struct file * file, poll_table * wait)
{
return POLLERR | POLLNVAL;
}
static long snd_disconnect_ioctl(struct file *file,
unsigned int cmd, unsigned long arg)
{
return -ENODEV;
}
static int snd_disconnect_mmap(struct file *file, struct vm_area_struct *vma)
{
return -ENODEV;
}
static int snd_disconnect_fasync(int fd, struct file *file, int on)
{
return -ENODEV;
}
/**
* snd_card_disconnect - disconnect all APIs from the file-operations (user space)
* @card: soundcard structure
@ -224,7 +257,16 @@ int snd_card_disconnect(struct snd_card *card)
memset(f_ops, 0, sizeof(*f_ops));
f_ops->owner = file->f_op->owner;
f_ops->release = file->f_op->release;
f_ops->llseek = snd_disconnect_llseek;
f_ops->read = snd_disconnect_read;
f_ops->write = snd_disconnect_write;
f_ops->poll = snd_disconnect_poll;
f_ops->unlocked_ioctl = snd_disconnect_ioctl;
#ifdef CONFIG_COMPAT
f_ops->compat_ioctl = snd_disconnect_ioctl;
#endif
f_ops->mmap = snd_disconnect_mmap;
f_ops->fasync = snd_disconnect_fasync;
s_f_ops->next = card->s_f_ops;
card->s_f_ops = s_f_ops;