The dgnc_block_til_ready() is only used in dgnc_tty_open(). The unit data(struct un_t) was stored into tty->driver_data in dgnc_tty_open(). And also tty and un were tested about NULL so these variables doesn't need to check for NULL in dgnc_block_til_ready().
Signed-off-by: Daeseok Youn <daeseok.y...@gmail.com> --- RESEND: more explanation about this patch. origin patch : https://lkml.org/lkml/2016/5/4/12 drivers/staging/dgnc/dgnc_tty.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c index a505775..cff34d4 100644 --- a/drivers/staging/dgnc/dgnc_tty.c +++ b/drivers/staging/dgnc/dgnc_tty.c @@ -1172,17 +1172,12 @@ static int dgnc_block_til_ready(struct tty_struct *tty, struct channel_t *ch) { int retval = 0; - struct un_t *un = NULL; + struct un_t *un = tty->driver_data; unsigned long flags; uint old_flags = 0; int sleep_on_un_flags = 0; - if (!tty || tty->magic != TTY_MAGIC || !file || !ch || - ch->magic != DGNC_CHANNEL_MAGIC) - return -ENXIO; - - un = tty->driver_data; - if (!un || un->magic != DGNC_UNIT_MAGIC) + if (!file) return -ENXIO; spin_lock_irqsave(&ch->ch_lock, flags); -- 2.8.2
