Hardcoded sleep causes userspace hang

[Lucy Kueny <lucy.kueny@xxxxxxxxxx>]

I was surprised to find a hardcoded "msleep(3000);" in the 
__cifs_reconnect function.
When using a cifs automount on wifi, a dropped connection results in an 
unusable system even in soft mode. Repeated re-connection attempts cause 
file browsers to hang for minutes. Auto-completion also freezes the 
command line, especially with zsh.
Systemd will attempt to reconnect for every file access and fail, 
letting the userspace deal with it. This behavior seems sane to me but 
requires the remount to fail as quickly as possible. Currently, it waits 
for 3 seconds every time.
Should this delay be user-adjustable?
The use case is specifically for NAS users with laptops, where leaving 
the local network is a common occurrence and hanging GUIs are undesirable.