r8169: don't request firmware when there's no userspace.
The firmware is cached during the first successfull call to open() and released once the network device is unregistered. The driver uses the cached firmware between open() and unregister_netdev(). So far the firmware is optional : a failure to load the firmware does not prevent open() to success. It is thus necessary to 1) unregister all 816x / 810[23] devices and 2) force a driver probe to issue a new firmware load. Signed-off-by: NFrancois Romieu <romieu@fr.zoreil.com> Fixed-by: NCiprian Docan <docan@eden.rutgers.edu> Cc: Realtek linux nic maintainers <nic_swsd@realtek.com>
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