From 5cd907853d5b777c11ecbc8de4482ea5f51663bc Mon Sep 17 00:00:00 2001 From: Matias Bjørling Date: Thu, 7 Jul 2016 09:54:17 +0200 Subject: lightnvm: remove nested lock conflict with mm MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit If a media manager tries to initialize it targets upon media manager initialization, the media manager will need to know which target types are available in LightNVM. The lists of which managers and target types are available shares the same lock. Therefore, on initialization, the nvm_lock is taken by LightNVM core, which later leads to a deadlock when target types are enumerated by the media manager. Add an exclusive lock for target types to resolve this conflict. Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/core.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) (limited to 'drivers/lightnvm') diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c index 8afb04cc4d5a..04469e0c84ce 100644 --- a/drivers/lightnvm/core.c +++ b/drivers/lightnvm/core.c @@ -28,6 +28,7 @@ #include static LIST_HEAD(nvm_tgt_types); +static DECLARE_RWSEM(nvm_tgtt_lock); static LIST_HEAD(nvm_mgrs); static LIST_HEAD(nvm_devices); static DECLARE_RWSEM(nvm_lock); @@ -37,7 +38,7 @@ struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock) struct nvm_tgt_type *tmp, *tt = NULL; if (lock) - down_write(&nvm_lock); + down_write(&nvm_tgtt_lock); list_for_each_entry(tmp, &nvm_tgt_types, list) if (!strcmp(name, tmp->name)) { @@ -46,7 +47,7 @@ struct nvm_tgt_type *nvm_find_target_type(const char *name, int lock) } if (lock) - up_write(&nvm_lock); + up_write(&nvm_tgtt_lock); return tt; } EXPORT_SYMBOL(nvm_find_target_type); @@ -55,12 +56,12 @@ int nvm_register_tgt_type(struct nvm_tgt_type *tt) { int ret = 0; - down_write(&nvm_lock); + down_write(&nvm_tgtt_lock); if (nvm_find_target_type(tt->name, 0)) ret = -EEXIST; else list_add(&tt->list, &nvm_tgt_types); - up_write(&nvm_lock); + up_write(&nvm_tgtt_lock); return ret; } -- cgit v1.2.3-59-g8ed1b