From a4304f2d5a3823deea894026ec95e43b33912357 Mon Sep 17 00:00:00 2001 From: Tilman Schmidt Date: Thu, 6 Aug 2009 20:33:33 -0700 Subject: [PATCH] tty: gigaset: really fix chars_in_buffer The tty_operation chars_in_buffer() is not allowed to return a negative value to signal an error. Corrects the problem flagged by commit 23198fda7182969b619613a555f8645fdc3dc334, "tty: fix chars_in_buffers". Signed-off-by: Tilman Schmidt Cc: "David S. Miller" Cc: stable Signed-off-by: Andrew Morton Signed-off-by: Greg Kroah-Hartman --- drivers/isdn/gigaset/interface.c | 19 +++++++------------ 1 file changed, 7 insertions(+), 12 deletions(-) diff --git a/drivers/isdn/gigaset/interface.c b/drivers/isdn/gigaset/interface.c index 8ff7e35c7069..f33ac27de643 100644 --- a/drivers/isdn/gigaset/interface.c +++ b/drivers/isdn/gigaset/interface.c @@ -408,33 +408,28 @@ static int if_write_room(struct tty_struct *tty) return retval; } -/* FIXME: This function does not have error returns */ - static int if_chars_in_buffer(struct tty_struct *tty) { struct cardstate *cs; - int retval = -ENODEV; + int retval = 0; cs = (struct cardstate *) tty->driver_data; if (!cs) { pr_err("%s: no cardstate\n", __func__); - return -ENODEV; + return 0; } gig_dbg(DEBUG_IF, "%u: %s()", cs->minor_index, __func__); - if (mutex_lock_interruptible(&cs->mutex)) - return -ERESTARTSYS; // FIXME -EINTR? + mutex_lock(&cs->mutex); - if (!cs->connected) { + if (!cs->connected) gig_dbg(DEBUG_IF, "not connected"); - retval = -ENODEV; - } else if (!cs->open_count) + else if (!cs->open_count) dev_warn(cs->dev, "%s: device not opened\n", __func__); - else if (cs->mstate != MS_LOCKED) { + else if (cs->mstate != MS_LOCKED) dev_warn(cs->dev, "can't write to unlocked device\n"); - retval = -EBUSY; - } else + else retval = cs->ops->chars_in_buffer(cs); mutex_unlock(&cs->mutex); -- 2.34.1