linux-kernel - [PATCH 1/2] pstore: Enable compression on normal path (again)

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Date:	Wed, 18 May 2016 21:00:05 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Anton Vorontsov <anton@...msg.org>,
	Colin Cross <ccross@...roid.com>,
	Kees Cook <keescook@...omium.org>,
	Tony Luck <tony.luck@...el.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/2] pstore: Enable compression on normal path (again)

The commit f0e2efcfd2717 ("pstore: do not use message compression
without lock") added a check to 'is_locked' to avoid breakage in
concurrent accesses.  But it has a side-effect of disabling compression
on normal path since 'is_locked' variable is not set.  As normal path
always takes the lock, it should be initialized to 1.

This also makes the unlock code a bit simpler.

Signed-off-by: Namhyung Kim <namhyung@...nel.org>
---
 fs/pstore/platform.c | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 588461bb2dd4..04a0164a2066 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -284,7 +284,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
 	u64		id;
 	unsigned int	part = 1;
 	unsigned long	flags = 0;
-	int		is_locked = 0;
+	int		is_locked = 1;
 	int		ret;
 
 	why = get_reason_str(reason);
@@ -350,10 +350,7 @@ static void pstore_dump(struct kmsg_dumper *dumper,
 		total += total_len;
 		part++;
 	}
-	if (pstore_cannot_block_path(reason)) {
-		if (is_locked)
-			spin_unlock_irqrestore(&psinfo->buf_lock, flags);
-	} else
+	if (is_locked)
 		spin_unlock_irqrestore(&psinfo->buf_lock, flags);
 }
 
-- 
2.8.0