linux-kernel - [PATCH v2] Staging: dgnc: release the lock before testing for nullity

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Date:	Wed, 18 Mar 2015 14:21:08 +0100
From:	Quentin Lambert <lambert.quentin@...il.com>
To:	Lidza Louina <lidza.louina@...il.com>
Cc:	Mark Hounschell <markh@...pro.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	driverdev-devel@...uxdriverproject.org, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
	Quentin Lambert <lambert.quentin@...il.com>
Subject: [PATCH v2] Staging: dgnc: release the lock before testing for nullity

The refactoring intrduced in
c84a083b995b ("Staging: dgnc: Use goto for spinlock release before return")
inverts the order in which the lock is released and ld is tested for nullity.

This patch restores the execution flow.

Fixes: c84a083b995b ("Staging: dgnc: Use goto for spinlock release before return")
Signed-off-by: Quentin Lambert <lambert.quentin@...il.com>
---
Changes since v1:
 - the commit message details the point of the patch
 - remove a blank line between the Fixes line and the signed-off line.

 drivers/staging/dgnc/dgnc_tty.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/dgnc/dgnc_tty.c b/drivers/staging/dgnc/dgnc_tty.c
index 8445f84ddaa3..f1c4d07a0aaa 100644
--- a/drivers/staging/dgnc/dgnc_tty.c
+++ b/drivers/staging/dgnc/dgnc_tty.c
@@ -656,9 +656,9 @@ void dgnc_input(struct channel_t *ch)
 	return;
 
 exit_unlock:
+	spin_unlock_irqrestore(&ch->ch_lock, flags);
 	if (ld)
 		tty_ldisc_deref(ld);
-	spin_unlock_irqrestore(&ch->ch_lock, flags);
 }
 
 
-- 
2.3.2.223.g7a9409c

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