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ipack: save carrier owner to allow device to get it

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There was not any kind of protection against carrier driver removal.
In this way, device driver can 'get' the carrier driver when it is
using it.

Signed-off-by: Federico Vaga <federico.vaga@cern.ch>
Acked-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Federico Vaga 2014-09-02 17:31:40 +02:00 • committed by Greg Kroah-Hartman
parent 78f22bc29e
commit 36c53b3cc3
3 changed files with 28 additions and 3 deletions
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24
include/linux/ipack.h
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@ -172,6 +172,7 @@ struct ipack_bus_ops {
* @ops: bus operations for the mezzanine drivers
*/
struct ipack_bus_device {
struct module *owner;
struct device *parent;
int slots;
int bus_nr;
@ -189,7 +190,8 @@ struct ipack_bus_device {
* available bus device in ipack.
*/
struct ipack_bus_device *ipack_bus_register(struct device *parent, int slots,
const struct ipack_bus_ops *ops);
const struct ipack_bus_ops *ops,
struct module *owner);
/**
* ipack_bus_unregister -- unregister an ipack bus
@ -265,3 +267,23 @@ void ipack_put_device(struct ipack_device *dev);
.format = (_format), \
.vendor = (vend), \
.device = (dev)
/**
* ipack_get_carrier - it increase the carrier ref. counter of
* the carrier module
* @dev: mezzanine device which wants to get the carrier
*/
static inline int ipack_get_carrier(struct ipack_device *dev)
{
return try_module_get(dev->bus->owner);
}
/**
* ipack_get_carrier - it decrease the carrier ref. counter of
* the carrier module
* @dev: mezzanine device which wants to get the carrier
*/
static inline void ipack_put_carrier(struct ipack_device *dev)
{
module_put(dev->bus->owner);
}