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Commit b884e2de authored by John Garry's avatar John Garry Committed by Wei Xu
Browse files

lib: logic_pio: Add logic_pio_unregister_range() 



Add a function to unregister a logical PIO range.

Logical PIO space can still be leaked when unregistering certain
LOGIC_PIO_CPU_MMIO regions, but this acceptable for now since there are no
callers to unregister LOGIC_PIO_CPU_MMIO regions, and the logical PIO
region allocation scheme would need significant work to improve this.

Cc: stable@vger.kernel.org
Signed-off-by: default avatarJohn Garry <john.garry@huawei.com>
Signed-off-by: default avatarWei Xu <xuwei5@hisilicon.com>
parent 0a27142b

include/linux/logic_pio.h

+1 −0
Original line number Diff line number Diff line
@@ -117,6 +117,7 @@ struct logic_pio_hwaddr *find_io_range_by_fwnode(struct fwnode_handle *fwnode); 
unsigned long logic_pio_trans_hwaddr(struct fwnode_handle *fwnode,

			resource_size_t hw_addr, resource_size_t size);

int logic_pio_register_range(struct logic_pio_hwaddr *newrange);

void logic_pio_unregister_range(struct logic_pio_hwaddr *range);

resource_size_t logic_pio_to_hwaddr(unsigned long pio);

unsigned long logic_pio_trans_cpuaddr(resource_size_t hw_addr);

lib/logic_pio.c

+14 −0
Original line number Diff line number Diff line
@@ -98,6 +98,20 @@ int logic_pio_register_range(struct logic_pio_hwaddr *new_range) 
	return ret;

}



/**

 * logic_pio_unregister_range - unregister a logical PIO range for a host

 * @range: pointer to the IO range which has been already registered.

 *

 * Unregister a previously-registered IO range node.

 */

void logic_pio_unregister_range(struct logic_pio_hwaddr *range)

{

	mutex_lock(&io_range_mutex);

	list_del_rcu(&range->list);

	mutex_unlock(&io_range_mutex);

	synchronize_rcu();

}



/**

 * find_io_range_by_fwnode - find logical PIO range for given FW node

 * @fwnode: FW node handle associated with logical PIO range