drivers/tty/tty_io.c

655 	 * We don't want to have driver/ldisc interactions beyond the ones
657 	 * from the ldisc side, which is now guaranteed.
840  * Iterate on the ldisc ->read() function until we've gotten all
841  * the data the ldisc has for us.
843  * The "cookie" is something that the ldisc read function can fill
846  * We promise to continue to call the ldisc until it stops returning
848  * ldisc maintains state for and needs to free.
888 		 * call if we had a cookie to let the ldisc clear up.
1365 		if (!tty->ldisc)
1442 	 * Structures all installed ... call the ldisc open routines.
1463 	tty_info_ratelimited(tty, "ldisc open failed (%d), clearing slot %d\n",
2198  * Locking: locks called line discipline but ldisc poll method may be
2449  * Retrieves the line discipline id directly from the ldisc.
2451  * Locking: waits for ldisc reference (in case the line discipline is changing
2785 		/* flush tty buffer and allow ldisc to process ioctl */