pstore: Convert "records_list" locking to mutex
The pstorefs internal list lock doesn't need to be a spinlock and will create problems when trying to access the list in the subsequent patch that will walk the pstorefs records during pstore_unregister(). Change this to a mutex to avoid may_sleep() warnings when unregistering devices. Link: https://lore.kernel.org/lkml/20200506152114.50375-6-keescook@chromium.org/Signed-off-by:Kees Cook <keescook@chromium.org>
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