n_hdlc: remove unused backup_tty
It's only set to NULL and never properly used. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20200219084118.26491-10-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -125,7 +125,6 @@ struct n_hdlc_buf_list {
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* struct n_hdlc - per device instance data structure
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* @magic - magic value for structure
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* @tty - ptr to TTY structure
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* @backup_tty - TTY to use if tty gets closed
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* @tbusy - reentrancy flag for tx wakeup code
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* @woke_up - FIXME: describe this field
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* @tx_buf_list - list of pending transmit frame buffers
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@ -136,7 +135,6 @@ struct n_hdlc_buf_list {
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struct n_hdlc {
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int magic;
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struct tty_struct *tty;
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struct tty_struct *backup_tty;
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int tbusy;
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int woke_up;
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struct n_hdlc_buf_list tx_buf_list;
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@ -267,15 +265,9 @@ static void n_hdlc_tty_close(struct tty_struct *tty)
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clear_bit(TTY_NO_WRITE_SPLIT,&tty->flags);
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#endif
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tty->disc_data = NULL;
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if (tty == n_hdlc->backup_tty)
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n_hdlc->backup_tty = NULL;
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if (tty != n_hdlc->tty)
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return;
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if (n_hdlc->backup_tty) {
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n_hdlc->tty = n_hdlc->backup_tty;
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} else {
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n_hdlc_release (n_hdlc);
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}
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n_hdlc_release (n_hdlc);
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} /* end of n_hdlc_tty_close() */
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/**
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