diff options
| author | Amit Shah <amit.shah@redhat.com> | 2010-09-02 16:50:58 +0400 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2010-10-21 11:14:03 +0400 |
| commit | 04950cdf071b6e5aa4794c93ad3e3ce8a1c4aa8c (patch) | |
| tree | 24a8d32ee63ef7c0a634e67dc67fdef0f84a14a6 /drivers/char/virtio_console.c | |
| parent | 6bdf2afd02ae12bf8ac93e6d14c4b4dfef7c4c59 (diff) | |
| download | linux-04950cdf071b6e5aa4794c93ad3e3ce8a1c4aa8c.tar.xz | |
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>
Diffstat (limited to 'drivers/char/virtio_console.c')
| -rw-r--r-- | drivers/char/virtio_console.c | 37 |
1 files changed, 36 insertions, 1 deletions
diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c index b70fe96c1ccd..0c8f2aa3074a 100644 --- a/drivers/char/virtio_console.c +++ b/drivers/char/virtio_console.c @@ -227,6 +227,41 @@ out: return port; } +static struct port *find_port_by_devt_in_portdev(struct ports_device *portdev, + dev_t dev) +{ + struct port *port; + unsigned long flags; + + spin_lock_irqsave(&portdev->ports_lock, flags); + list_for_each_entry(port, &portdev->ports, list) + if (port->cdev.dev == dev) + goto out; + port = NULL; +out: + spin_unlock_irqrestore(&portdev->ports_lock, flags); + + return port; +} + +static struct port *find_port_by_devt(dev_t dev) +{ + struct ports_device *portdev; + struct port *port; + unsigned long flags; + + spin_lock_irqsave(&pdrvdata_lock, flags); + list_for_each_entry(portdev, &pdrvdata.portdevs, list) { + port = find_port_by_devt_in_portdev(portdev, dev); + if (port) + goto out; + } + port = NULL; +out: + spin_unlock_irqrestore(&pdrvdata_lock, flags); + return port; +} + static struct port *find_port_by_id(struct ports_device *portdev, u32 id) { struct port *port; @@ -719,7 +754,7 @@ static int port_fops_open(struct inode *inode, struct file *filp) struct port *port; int ret; - port = container_of(cdev, struct port, cdev); + port = find_port_by_devt(cdev->dev); filp->private_data = port; /* |