From 5f33141d2fc05a2d2134ba0e7b47ce4aa88340f0 Mon Sep 17 00:00:00 2001 From: Gerd Rausch Date: Tue, 16 Jul 2019 15:29:02 -0700 Subject: net/rds: Wait for the FRMR_IS_FREE (or FRMR_IS_STALE) transition after posting IB_WR_LOCAL_INV In order to: 1) avoid a silly bouncing between "clean_list" and "drop_list" triggered by function "rds_ib_reg_frmr" as it is releases frmr regions whose state is not "FRMR_IS_FREE" right away. 2) prevent an invalid access error in a race from a pending "IB_WR_LOCAL_INV" operation with a teardown ("dma_unmap_sg", "put_page") and de-registration ("ib_dereg_mr") of the corresponding memory region. Signed-off-by: Gerd Rausch Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller --- net/rds/ib_mr.h | 2 ++ 1 file changed, 2 insertions(+) (limited to 'net/rds/ib_mr.h') diff --git a/net/rds/ib_mr.h b/net/rds/ib_mr.h index ab26c20ed66f..9045a8c0edff 100644 --- a/net/rds/ib_mr.h +++ b/net/rds/ib_mr.h @@ -58,6 +58,8 @@ struct rds_ib_frmr { enum rds_ib_fr_state fr_state; bool fr_inv; wait_queue_head_t fr_inv_done; + bool fr_reg; + wait_queue_head_t fr_reg_done; struct ib_send_wr fr_wr; unsigned int dma_npages; unsigned int sg_byte_len; -- cgit v1.2.3