linux-kernel - [PATCH v2 4/4] net/p9: load default transports

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Date:   Wed,  3 Nov 2021 20:38:23 +0100
From:   Thomas Weißschuh <linux@...ssschuh.net>
To:     v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org
Cc:     Thomas Weißschuh <linux@...ssschuh.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Stefano Stabellini <stefano@...reto.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 4/4] net/p9: load default transports

Now that all transports are split into modules it may happen that no
transports are registered when v9fs_get_default_trans() is called.
When that is the case try to load more transports from modules.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 net/9p/mod.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/9p/mod.c b/net/9p/mod.c
index 8f1d067b272e..7bb875cd279f 100644
--- a/net/9p/mod.c
+++ b/net/9p/mod.c
@@ -128,6 +128,10 @@ struct p9_trans_module *v9fs_get_trans_by_name(const char *s)
 }
 EXPORT_SYMBOL(v9fs_get_trans_by_name);
 
+static const char * const v9fs_default_transports[] = {
+	"virtio", "tcp", "fd", "unix", "xen", "rdma",
+};
+
 /**
  * v9fs_get_default_trans - get the default transport
  *
@@ -136,6 +140,7 @@ EXPORT_SYMBOL(v9fs_get_trans_by_name);
 struct p9_trans_module *v9fs_get_default_trans(void)
 {
 	struct p9_trans_module *t, *found = NULL;
+	int i;
 
 	spin_lock(&v9fs_trans_lock);
 
@@ -153,6 +158,10 @@ struct p9_trans_module *v9fs_get_default_trans(void)
 			}
 
 	spin_unlock(&v9fs_trans_lock);
+
+	for (i = 0; !found && i < ARRAY_SIZE(v9fs_default_transports); i++)
+		found = v9fs_get_trans_by_name(v9fs_default_transports[i]);
+
 	return found;
 }
 EXPORT_SYMBOL(v9fs_get_default_trans);
-- 
2.33.1