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virtio: console: replace EMFILE with EBUSY for already-open port 

Returning EMFILE (process has too many open files) is incorrect to
indicate a port is already open by another process.  Use EBUSY for that.

This does change what we report to userspace, but I believe userspace
can look at it this way: it gets EBUSY, a new error code, instead of
EMFILE.  It's still an error, and that's not changing.

Reported-by: Mateusz Guzik <mguzik@redhat.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Amit Shah 2013-04-15 12:00:15 +09:30 committed by Rusty Russell
parent 285e71ea6f
commit 74ff582cd6
1 changed files with 1 additions and 1 deletions
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2
drivers/char/virtio_console.c
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@ -1036,7 +1036,7 @@ static int port_fops_open(struct inode *inode, struct file *filp)
spin_lock_irq(&port->inbuf_lock);
if (port->guest_connected) {
spin_unlock_irq(&port->inbuf_lock);
ret = -EMFILE;
ret = -EBUSY;
goto out;
}