Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
From:   Nicolas Pitre <nicolas.pitre@linaro.org>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Dave Mielke <Dave@mielke.cc>, linux-kernel@vger.kernel.org
Subject: [PATCH 6/6] vcs: fasync(): make it consistent with poll()
Date:   Tue,  8 Jan 2019 22:55:04 -0500
Message-Id: <20190109035504.8413-7-nicolas.pitre@linaro.org>
In-Reply-To: <20190109035504.8413-1-nicolas.pitre@linaro.org>
References: <20190109035504.8413-1-nicolas.pitre@linaro.org>
MIME-Version: 1.0
Content-Transfer-Encoding: quoted-printable
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

We use POLLPRI not POLLIN to wait for data with poll() as there is
never any incoming data stream per se. Let's use the same semantic
with fasync() for consistency, including the fact that a vt may go away.

No known user space ever relied on the SIGIO reason so far, let alone
FASYNC, so the risk of breakage is pretty much nonexistent.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
 drivers/tty/vt/vc_screen.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c
index 1bbe2a30cd..1d887113ff 100644
--- a/drivers/tty/vt/vc_screen.c
+++ b/drivers/tty/vt/vc_screen.c
@@ -93,9 +93,18 @@ vcs_notifier(struct notifier_block *nb, unsigned long =
code, void *_param)
 	struct vcs_poll_data *poll =3D
 		container_of(nb, struct vcs_poll_data, notifier);
 	int currcons =3D poll->cons_num;
-
-	if (code !=3D VT_UPDATE && code !=3D VT_DEALLOCATE)
+	int fa_band;
+
+	switch (code) {
+	case VT_UPDATE:
+		fa_band =3D POLL_PRI;
+		break;
+	case VT_DEALLOCATE:
+		fa_band =3D POLL_HUP;
+		break;
+	default:
 		return NOTIFY_DONE;
+	}
=20
 	if (currcons =3D=3D 0)
 		currcons =3D fg_console;
@@ -106,7 +115,7 @@ vcs_notifier(struct notifier_block *nb, unsigned long=
 code, void *_param)
=20
 	poll->event =3D code;
 	wake_up_interruptible(&poll->waitq);
-	kill_fasync(&poll->fasync, SIGIO, POLL_IN);
+	kill_fasync(&poll->fasync, SIGIO, fa_band);
 	return NOTIFY_OK;
 }
=20
--=20
2.20.1