linux-kernel - [PATCH 01/15 RESEND] staging: dgnc: remove redundant NULL checks in

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Date:	Wed, 6 Jul 2016 15:11:13 +0900
From:	Daeseok Youn <daeseok.youn@...il.com>
To:	lidza.louina@...il.com
Cc:	markh@...pro.net, gregkh@...uxfoundation.org,
	driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 01/15 RESEND] staging: dgnc: remove redundant NULL checks in

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.youn@...il.com>
---
RESEND: This patch was not merged for a long time, if there is any reason
why this patch could NOT be merged into staging tree, let me know.
There were no comment for this patch.
I cannot understand why this patch have to wait long time to merge.
And I also sent emails to mailing-lists for reminding this patch...
please let me know, what is the problem to merge this patch into staging tree.

 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 4eeecc9..6758859 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);
-- 
1.9.1