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Date: Wed, 24 Apr 2013 08:38:18 -0700 From: Dmitry Torokhov <dtor@...are.com> To: Asias He <asias@...hat.com> Cc: netdev@...r.kernel.org, "David S. Miller" <davem@...emloft.net>, Andy King <acking@...are.com>, Reilly Grant <grantr@...are.com>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] VSOCK: Fix misc device registration On Wed, Apr 24, 2013 at 02:33:52PM +0800, Asias He wrote: > 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@...emloft.net> > Cc: Andy King <acking@...are.com> > Cc: Dmitry Torokhov <dtor@...are.com> > Cc: Reilly Grant <grantr@...are.com> > Cc: netdev@...r.kernel.org > Cc: linux-kernel@...r.kernel.org > Signed-off-by: Asias He <asias@...hat.com> Well spotted. Acked-by: Dmitry Torokhov <dtor@...are.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 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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