[PATCH 4.9 74/75] n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD)

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Linus Torvalds commit 966031f340185eddd05affcf72b740549f056348 upstream. We added support for EXTPROC back in 2010 in commit 26df6d13406d ("tty: Add EXTPROC

[PATCH 4.9 74/75] n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD)

4.9-stable review patch. If anyone has any objections, please let me know. -- From: Linus Torvalds commit 966031f340185eddd05affcf72b740549f056348 upstream. We added support for EXTPROC back in 2010 in commit 26df6d13406d ("tty: Add EXTPROC support for LINEMODE") and the