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serdev: fix controller-allocation error handling 

Reorder controller initialisation so that in the unlikely event that id
allocation fails, we don't end up releasing id 0 in the destructor.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-10-12 15:28:18 +02:00 committed by Greg Kroah-Hartman
parent 08fcee289f
commit 978d6fac5d
1 changed files with 14 additions and 9 deletions
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23
drivers/tty/serdev/core.c
View File

@ -358,6 +358,15 @@ struct serdev_controller *serdev_controller_alloc(struct device *parent,
if (!ctrl)
return NULL;
id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
dev_err(parent,
"unable to allocate serdev controller identifier.\n");
goto err_free;
}
ctrl->nr = id;
device_initialize(&ctrl->dev);
ctrl->dev.type = &serdev_ctrl_type;
ctrl->dev.bus = &serdev_bus_type;
@ -365,19 +374,15 @@ struct serdev_controller *serdev_controller_alloc(struct device *parent,
ctrl->dev.of_node = parent->of_node;
serdev_controller_set_drvdata(ctrl, &ctrl[1]);
id = ida_simple_get(&ctrl_ida, 0, 0, GFP_KERNEL);
if (id < 0) {
dev_err(parent,
"unable to allocate serdev controller identifier.\n");
serdev_controller_put(ctrl);
return NULL;
}
ctrl->nr = id;
dev_set_name(&ctrl->dev, "serial%d", id);
dev_dbg(&ctrl->dev, "allocated controller 0x%p id %d\n", ctrl, id);
return ctrl;
err_free:
kfree(ctrl);
return NULL;
}
EXPORT_SYMBOL_GPL(serdev_controller_alloc);