Commit 6ad0b2f7 authored Apr 23, 2013 by Asias He Committed by David S. Miller Apr 25, 2013

VSOCK: Fix misc device registration



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" <davem@davemloft.net>
Cc: Andy King <acking@vmware.com>
Cc: Dmitry Torokhov <dtor@vmware.com>
Cc: Reilly Grant <grantr@vmware.com>
Cc: netdev@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Asias He <asias@redhat.com>
Acked-by: Dmitry Torokhov <dtor@vmware.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c6cdcf6d

net/vmw_vsock/af_vsock.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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");