From b884e2de2afc68ce30f7093747378ef972dde253 Mon Sep 17 00:00:00 2001 From: John Garry Date: Tue, 30 Jul 2019 21:29:54 +0800 Subject: [PATCH] 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: John Garry Signed-off-by: Wei Xu --- include/linux/logic_pio.h | 1 + lib/logic_pio.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+) diff --git a/include/linux/logic_pio.h b/include/linux/logic_pio.h index cbd9d8495690..88e1e6304a71 100644 --- a/include/linux/logic_pio.h +++ b/include/linux/logic_pio.h @@ -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); diff --git a/lib/logic_pio.c b/lib/logic_pio.c index d0165c88f705..905027574e5d 100644 --- a/lib/logic_pio.c +++ b/lib/logic_pio.c @@ -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