File 0030-drbd-kref_put-path-when-kernel_accept-fail... of Package drbd

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File 0030-drbd-kref_put-path-when-kernel_accept-fails.patch of Package drbd

From 9fe2be655a793d2f9425b96e53a7e1e7feec067e Mon Sep 17 00:00:00 2001
From: Joel Colledge <joel.colledge@linbit.com>
Date: Wed, 18 Sep 2024 15:08:55 +0200
Subject: [PATCH 30/32] drbd: kref_put() path when kernel_accept() fails

We need to put the reference that dtt_wait_connect_cond() gets.

This is an unusual situation. The function dtt_wait_connect_cond() only
returns a path when pending_accepts is positive or there is a socket in
the path->sockets list. So if the code reaches the kernel_accept() call,
we expect it to succeed. However, it has been observed to fail, so we
need to handle that case cleanly.

Without the kref_put(), it is impossible to rmmod drbd.

For any error other than -EAGAIN, the error is be passed up and is
logged by conn_connect(). However, when -EAGAIN is returned,
dtt_connect() continues trying to connect and the error from
kernel_accept() leaves no traces in the logs.
---
 drbd/drbd_transport_tcp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drbd/drbd_transport_tcp.c b/drbd/drbd_transport_tcp.c
index df144fcb4522..d59f68d83c58 100644
--- a/drbd/drbd_transport_tcp.c
+++ b/drbd/drbd_transport_tcp.c
@@ -625,8 +625,10 @@ retry:
 
 		s_estab = NULL;
 		err = kernel_accept(listener->s_listen, &s_estab, O_NONBLOCK);
-		if (err < 0)
+		if (err < 0) {
+			kref_put(&path->path.kref, drbd_destroy_path);
 			return err;
+		}
 
 		/* The established socket inherits the sk_state_change callback
 		   from the listening socket. */
-- 
2.35.3

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File 0030-drbd-kref_put-path-when-kernel_accept-fails.patch of Package drbd

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