From: Nicolas Pitre Date: Wed, 9 Jan 2019 03:55:04 +0000 (-0500) Subject: vcs: fasync(): make it consistent with poll() X-Git-Tag: rel_imx_5.10.35_2.0.0-somdevices.0~5214^2~44 X-Git-Url: https://git.somdevices.com/?a=commitdiff_plain;h=fad08b205cf134759c28d182905bf27762017192;p=linux.git vcs: fasync(): make it consistent with poll() 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 Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/vt/vc_screen.c b/drivers/tty/vt/vc_screen.c index 1bbe2a30cdbe..1d887113ff49 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 = container_of(nb, struct vcs_poll_data, notifier); int currcons = poll->cons_num; - - if (code != VT_UPDATE && code != VT_DEALLOCATE) + int fa_band; + + switch (code) { + case VT_UPDATE: + fa_band = POLL_PRI; + break; + case VT_DEALLOCATE: + fa_band = POLL_HUP; + break; + default: return NOTIFY_DONE; + } if (currcons == 0) currcons = fg_console; @@ -106,7 +115,7 @@ vcs_notifier(struct notifier_block *nb, unsigned long code, void *_param) poll->event = code; wake_up_interruptible(&poll->waitq); - kill_fasync(&poll->fasync, SIGIO, POLL_IN); + kill_fasync(&poll->fasync, SIGIO, fa_band); return NOTIFY_OK; }