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greybus: Tear down devices in the reverse order 

Normally, its a good practice to free resources in the reverse order in
which they are allocated, so that all the dependencies can be sorted out
properly.

This is true while creating/destroying devices as well. For example
consider this scenario (I faced a crash with control protocol due to
this). For a new module, we will first create a bundle+connection for
the control cport and then create other bundles/connections after
parsing manifest.

And while destroying interface on module hot unplug, we are removing the
devices in the order they are added. And so the bundle/connection for
the control cport are destroyed first. But, control cport was still
required while destroying other bundles/connections.

To solve this problem, lets destroy the resources in the reverse order
in which they are added.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Viresh Kumar 2015-06-04 18:16:45 +05:30 committed by Greg Kroah-Hartman
parent d51c0ffb5c
commit 928f2abd5f
3 changed files with 4 additions and 4 deletions
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2
drivers/staging/greybus/bundle.c
View File

@ -196,7 +196,7 @@ struct gb_bundle *gb_bundle_create(struct gb_interface *intf, u8 bundle_id,
}
spin_lock_irq(&gb_bundles_lock);
list_add_tail(&bundle->links, &intf->bundles);
list_add(&bundle->links, &intf->bundles);
spin_unlock_irq(&gb_bundles_lock);
return bundle;

4
drivers/staging/greybus/connection.c
View File

@ -213,8 +213,8 @@ struct gb_connection *gb_connection_create(struct gb_bundle *bundle,
"protocol 0x%02hhx handler not found\n", protocol_id);
spin_lock_irq(&gb_connections_lock);
list_add_tail(&connection->hd_links, &hd->connections);
list_add_tail(&connection->bundle_links, &bundle->connections);
list_add(&connection->hd_links, &hd->connections);
list_add(&connection->bundle_links, &bundle->connections);
spin_unlock_irq(&gb_connections_lock);
atomic_set(&connection->op_cycle, 0);

2
drivers/staging/greybus/interface.c
View File

@ -122,7 +122,7 @@ static struct gb_interface *gb_interface_create(struct greybus_host_device *hd,
}
spin_lock_irq(&gb_interfaces_lock);
list_add_tail(&intf->links, &hd->interfaces);
list_add(&intf->links, &hd->interfaces);
spin_unlock_irq(&gb_interfaces_lock);
return intf;