From: Md Haris Iqbal haris.iqbal@ionos.com
stable inclusion from stable-v6.6.7 commit 5aafdb5e9324c240941c805be36f2a8aa932c2c6 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8SSQ4
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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[ Upstream commit c4d32e77fc1006f99eeb78417efc3d81a384072a ]
Destroying path files may lead to the freeing of rdma_stats. This creates the following race.
An IO is in-flight, or has just passed the session state check in process_read/process_write. The close_work gets triggered and the function rtrs_srv_close_work() starts and does destroy path which frees the rdma_stats. After this the function process_read/process_write resumes and tries to update the stats through the function rtrs_srv_update_rdma_stats
This commit solves the problem by moving the destroy path function to a later point. This point makes sure any inflights are completed. This is done by qp drain, and waiting for all in-flights through ops_id.
Fixes: 9cb837480424 ("RDMA/rtrs: server: main functionality") Signed-off-by: Md Haris Iqbal haris.iqbal@ionos.com Signed-off-by: Santosh Kumar Pradhan santosh.pradhan@ionos.com Signed-off-by: Grzegorz Prajsner grzegorz.prajsner@ionos.com Link: https://lore.kernel.org/r/20231120154146.920486-6-haris.iqbal@ionos.com Signed-off-by: Leon Romanovsky leon@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com --- drivers/infiniband/ulp/rtrs/rtrs-srv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-srv.c b/drivers/infiniband/ulp/rtrs/rtrs-srv.c index 925b71481c62..1d33efb8fb03 100644 --- a/drivers/infiniband/ulp/rtrs/rtrs-srv.c +++ b/drivers/infiniband/ulp/rtrs/rtrs-srv.c @@ -1532,7 +1532,6 @@ static void rtrs_srv_close_work(struct work_struct *work)
srv_path = container_of(work, typeof(*srv_path), close_work);
- rtrs_srv_destroy_path_files(srv_path); rtrs_srv_stop_hb(srv_path);
for (i = 0; i < srv_path->s.con_num; i++) { @@ -1552,6 +1551,8 @@ static void rtrs_srv_close_work(struct work_struct *work) /* Wait for all completion */ wait_for_completion(&srv_path->complete_done);
+ rtrs_srv_destroy_path_files(srv_path); + /* Notify upper layer if we are the last path */ rtrs_srv_path_down(srv_path);