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From: Pavel Begunkov <[email protected]>
To: [email protected]
Cc: Jens Axboe <[email protected]>,
	[email protected], [email protected]
Subject: [PATCH v2 11/13] io_uring/rsrc: add lockdep sanity checks
Date: Tue,  4 Apr 2023 13:39:55 +0100	[thread overview]
Message-ID: <b50d5f156ac41450029796738c1dfd22a521df7a.1680576071.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

We should hold ->uring_lock while putting nodes with io_put_rsrc_node(),
add a lockdep check for that.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 io_uring/io_uring.c | 4 ++--
 io_uring/rsrc.c     | 2 +-
 io_uring/rsrc.h     | 6 ++++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index 419d6f42935f..da36fa1eeac9 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -1002,7 +1002,7 @@ static void __io_req_complete_post(struct io_kiocb *req, unsigned issue_flags)
 
 	if (rsrc_node) {
 		io_ring_submit_lock(ctx, issue_flags);
-		io_put_rsrc_node(rsrc_node);
+		io_put_rsrc_node(ctx, rsrc_node);
 		io_ring_submit_unlock(ctx, issue_flags);
 	}
 }
@@ -1123,7 +1123,7 @@ static __cold void io_free_req_tw(struct io_kiocb *req, struct io_tw_state *ts)
 
 	if (req->rsrc_node) {
 		io_tw_lock(ctx, ts);
-		io_put_rsrc_node(req->rsrc_node);
+		io_put_rsrc_node(ctx, req->rsrc_node);
 	}
 	io_dismantle_req(req);
 	io_put_task_remote(req->task, 1);
diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c
index cbf563fcb053..95edc5f73204 100644
--- a/io_uring/rsrc.c
+++ b/io_uring/rsrc.c
@@ -236,7 +236,7 @@ void io_rsrc_node_switch(struct io_ring_ctx *ctx,
 
 		atomic_inc(&data_to_kill->refs);
 		/* put master ref */
-		io_put_rsrc_node(rsrc_node);
+		io_put_rsrc_node(ctx, rsrc_node);
 		ctx->rsrc_node = NULL;
 	}
 
diff --git a/io_uring/rsrc.h b/io_uring/rsrc.h
index 3b9f4c57c47c..cf24c3fd701f 100644
--- a/io_uring/rsrc.h
+++ b/io_uring/rsrc.h
@@ -119,8 +119,10 @@ int io_register_rsrc_update(struct io_ring_ctx *ctx, void __user *arg,
 int io_register_rsrc(struct io_ring_ctx *ctx, void __user *arg,
 			unsigned int size, unsigned int type);
 
-static inline void io_put_rsrc_node(struct io_rsrc_node *node)
+static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
 {
+	lockdep_assert_held(&ctx->uring_lock);
+
 	if (node && !--node->refs)
 		io_rsrc_node_ref_zero(node);
 }
@@ -128,7 +130,7 @@ static inline void io_put_rsrc_node(struct io_rsrc_node *node)
 static inline void io_req_put_rsrc_locked(struct io_kiocb *req,
 					  struct io_ring_ctx *ctx)
 {
-	io_put_rsrc_node(req->rsrc_node);
+	io_put_rsrc_node(ctx, req->rsrc_node);
 }
 
 static inline void io_charge_rsrc_node(struct io_ring_ctx *ctx,
-- 
2.39.1


  parent reply	other threads:[~2023-04-04 12:41 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-04-04 12:39 [PATCH v2 00/13] optimise registered buffer/file updates Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 01/13] io_uring/rsrc: use non-pcpu refcounts for nodes Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 02/13] io_uring/rsrc: keep cached refs per node Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 03/13] io_uring: don't put nodes under spinlocks Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 04/13] io_uring: io_free_req() via tw Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 05/13] io_uring/rsrc: protect node refs with uring_lock Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 06/13] io_uring/rsrc: kill rsrc_ref_lock Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 07/13] io_uring/rsrc: rename rsrc_list Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 08/13] io_uring/rsrc: optimise io_rsrc_put allocation Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 09/13] io_uring/rsrc: don't offload node free Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 10/13] io_uring/rsrc: cache struct io_rsrc_node Pavel Begunkov
2023-04-04 12:39 ` Pavel Begunkov [this message]
2023-04-04 12:39 ` [PATCH v2 12/13] io_uring/rsrc: optimise io_rsrc_data refcounting Pavel Begunkov
2023-04-04 12:39 ` [PATCH v2 13/13] io_uring/rsrc: add custom limit for node caching Pavel Begunkov
2023-04-04 15:30 ` [PATCH v2 00/13] optimise registered buffer/file updates Jens Axboe
2023-04-04 15:33 ` Jens Axboe

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