I have tested 2.1.10, same behaviour asking for a password for the subkey.
------Original Message------
From: Werner Koch via BTS
To: Mr Pratish Surendra Neerputh
To: wk@gnupg.org
ReplyTo: GnuPG's BTS
ReplyTo: GnuPG's BTS
Subject: [issue1848] gpg 2.1.2 with pinentry-curses prompts for passphrase when adding subkeys
Sent: Jan 18, 2016 09:46

I have tried version 2.1.9 as I couldn't get the latest version. It still prompts for a password when adding a subkey, I have also seen this behaviour with a windows binary. It does not seem to affect signing or encryption as signing still just requires the passphrase for the master key.
------Original Message------
From: Werner Koch via BTS
To: Mr Pratish Surendra Neerputh
To: wk@gnupg.org
ReplyTo: GnuPG's BTS
ReplyTo: GnuPG's BTS
Subject: [issue1848] gpg 2.1.2 with pinentry-curses prompts for passphrase when adding subkeys
Sent: Jan 18, 2016 09:46

My original problem was that when generating one signing key with gnupg stable aka 2.0.29 and adding a seperate encryption subkey it only asked for my passphase to unlock the master secret key.

I could attach some screen shots if that may be of any help.

In the last non modern version (i downgraded) after the 2.1.2 problem, 2.0.27,
when i generated a new subkey, the only passphrase asked was to unlock the private
key, it never prompted me for another passphrase for the subkey.

Yes it asks for the passphrase to unlock the keyring, nut when i want to generate
a key, it asks me for the passphrase to unlock the keyring which i provide, then
it follows up with a "enter a new passphrase" dialog. If i cancel said dialog then
it does not allow me to generate and add the key.