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lib: logic_pio: Add logic_pio_unregister_range()

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commit b884e2de2afc68ce30f7093747378ef972dde253 upstream.

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: John Garry <john.garry@huawei.com>
Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
John Garry 2019-07-30 21:29:54 +08:00 • committed by Greg Kroah-Hartman
commit c4616a9b3d
1 changed files with 15 additions and 0 deletions
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14
lib/logic_pio.c
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@ -98,6 +98,20 @@ end_register:
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