5.4-stable review patch. If anyone has any objections, please let me know.
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From: Fabian Vogt fvogt@suse.de
commit cfd956dcb101aa3d25bac321fae923323a47c607 upstream.
After hvc_write completes, call hvc_kick also in the case the output buffer has been drained, to ensure tty_wakeup gets called.
This fixes that functions which wait for a drained buffer got stuck occasionally.
Cc: stable stable@kernel.org Closes: https://bugzilla.opensuse.org/show_bug.cgi?id=1230062 Signed-off-by: Fabian Vogt fvogt@suse.de Link: https://lore.kernel.org/r/2011735.PYKUYFuaPT@fvogt-thinkpad Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/tty/hvc/hvc_console.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/tty/hvc/hvc_console.c +++ b/drivers/tty/hvc/hvc_console.c @@ -543,10 +543,10 @@ static int hvc_write(struct tty_struct * }
/* - * Racy, but harmless, kick thread if there is still pending data. + * Kick thread to flush if there's still pending data + * or to wakeup the write queue. */ - if (hp->n_outbuf) - hvc_kick(); + hvc_kick();
return written; }