read / write / close sync for device files

[Greg KH]

On Tue, Jul 05, 2011 at 12:37:26PM +0530, Amit Nagal wrote:
> so do the usb-core layers or VFS layers maintains some locks that take
> care that if read / write is in progress
> and application calls close() , corresponding release() method in usb
> driver will be called only upon completion
> of all read / writes ?

No, release will be called when all of the userspace file handles call
close(), and not before.

hope this helps,

greg k-h