From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daeseok Youn Date: Tue, 10 May 2016 06:44:50 +0000 Subject: [PATCH 1/2 RESEND] staging: dgnc: remove redundant NULL checks in Message-Id: <20160510064450.GA25522@certreview.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: lidza.louina@gmail.com Cc: markh@compro.net, gregkh@linuxfoundation.org, driverdev-devel@linuxdriverproject.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org 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 --- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751063AbcEJGpm (ORCPT ); Tue, 10 May 2016 02:45:42 -0400 Received: from mail-pa0-f50.google.com ([209.85.220.50]:36425 "EHLO mail-pa0-f50.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750741AbcEJGpk (ORCPT ); Tue, 10 May 2016 02:45:40 -0400 Date: Tue, 10 May 2016 15:44:50 +0900 From: Daeseok Youn To: lidza.louina@gmail.com Cc: markh@compro.net, gregkh@linuxfoundation.org, driverdev-devel@linuxdriverproject.org, devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH 1/2 RESEND] staging: dgnc: remove redundant NULL checks in Message-ID: <20160510064450.GA25522@certreview.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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 --- 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