When we call vsock_core_init to init VSOCK the second time,
vsock_device.minor still points to the old dynamically allocated minor
number. misc_register will allocate it for us successfully as if we were
asking for a static one. However, when other user call misc_register to
allocate a dynamic minor number, it will give the one used by
vsock_core_init(), causing this:
[ 405.470687] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xcc/0xf0()
[ 405.470689] Hardware name: OptiPlex 790
[ 405.470690] sysfs: cannot create duplicate filename '/dev/char/10:54'
Always set vsock_device.minor to MISC_DYNAMIC_MINOR before we
register.
Cc: "David S. Miller" <da...@davemloft.net>
Cc: Andy King <ack...@vmware.com>
Cc: Dmitry Torokhov <d...@vmware.com>
Cc: Reilly Grant <gra...@vmware.com>
Cc: net...@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Asias He <as...@redhat.com>
---
net/vmw_vsock/af_vsock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/vmw_vsock/af_vsock.c b/net/vmw_vsock/af_vsock.c
index 7f93e2a..4b4db18 100644
--- a/net/vmw_vsock/af_vsock.c
+++ b/net/vmw_vsock/af_vsock.c
@@ -1932,7 +1932,6 @@ static const struct file_operations vsock_device_ops = {
static struct miscdevice vsock_device = {
.name = "vsock",
- .minor = MISC_DYNAMIC_MINOR,
.fops = &vsock_device_ops,
};
@@ -1942,6 +1941,7 @@ static int __vsock_core_init(void)
vsock_init_tables();
+ vsock_device.minor = MISC_DYNAMIC_MINOR;
err = misc_register(&vsock_device);
if (err) {
pr_err("Failed to register misc device\n");
--
1.8.1.4
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