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H A D | logic_pio.c | diff 06709e81c668f5f56c65b806895b278517bd44e0 Tue Jul 30 15:29:52 CEST 2019 John Garry <john.garry@huawei.com> lib: logic_pio: Fix RCU usage
The traversing of io_range_list with list_for_each_entry_rcu() is not properly protected by rcu_read_lock() and rcu_read_unlock(), so add them.
These functions mark the critical section scope where the list is protected for the reader, it cannot be "reclaimed". Any updater - in this case, the logical PIO registration functions - cannot update the list until the reader exits this critical section.
In addition, the list traversing used in logic_pio_register_range() does not need to use the rcu variant.
This is because we are already using io_range_mutex to guarantee mutual exclusion from mutating the list.
Cc: stable@vger.kernel.org Fixes: 031e3601869c ("lib: Add generic PIO mapping method") Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Wei Xu <xuwei5@hisilicon.com>
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