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authorAmit Shah <amit.shah@redhat.com>2010-09-02 18:20:58 +0530
committerRusty Russell <rusty@rustcorp.com.au>2010-10-21 17:44:03 +1030
commit04950cdf071b6e5aa4794c93ad3e3ce8a1c4aa8c (patch)
tree24a8d32ee63ef7c0a634e67dc67fdef0f84a14a6 /drivers/char/virtio_console.c
parent6bdf2afd02ae12bf8ac93e6d14c4b4dfef7c4c59 (diff)
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.c37
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;
/*