virtio: console: Add a find_port_by_devt() function
To convert to using cdev as a pointer to avoid kref troubles, we have to use a different method to get to a port from an inode than the current container_of method. Add find_port_by_devt() that looks up all portdevs and ports with those portdevs to find the right port. Signed-off-by: Amit Shah <amit.shah@redhat.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
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1 changed files with 36 additions and 1 deletions
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@ -227,6 +227,41 @@ out:
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return port;
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}
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static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev,
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dev_t dev)
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{
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struct port *port;
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unsigned long flags;
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spin_lock_irqsave(&portdev->ports_lock, flags);
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list_for_each_entry(port, &portdev->ports, list)
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if (port->cdev.dev == dev)
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goto out;
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port = NULL;
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out:
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spin_unlock_irqrestore(&portdev->ports_lock, flags);
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return port;
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}
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static struct port *find_port_by_devt(dev_t dev)
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{
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struct ports_device *portdev;
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struct port *port;
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unsigned long flags;
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spin_lock_irqsave(&pdrvdata_lock, flags);
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list_for_each_entry(portdev, &pdrvdata.portdevs, list) {
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port = find_port_by_devt_in_portdev(portdev, dev);
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if (port)
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goto out;
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}
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port = NULL;
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out:
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spin_unlock_irqrestore(&pdrvdata_lock, flags);
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return port;
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}
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static struct port *find_port_by_id(struct ports_device *portdev, u32 id)
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{
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struct port *port;
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@ -719,7 +754,7 @@ static int port_fops_open(struct inode *inode, struct file *filp)
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struct port *port;
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int ret;
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port = container_of(cdev, struct port, cdev);
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port = find_port_by_devt(cdev->dev);
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filp->private_data = port;
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/*
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