linux-ext4 - [PATCH 2/2] printk: Debug patch 2

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Date:	Fri, 10 Oct 2014 16:23:48 +0200
From:	Jan Kara <jack@...e.cz>
To:	linux-fsdevel@...r.kernel.org
Cc:	linux-ext4@...r.kernel.org, Dave Chinner <david@...morbit.com>,
	xfs@....sgi.com, cluster-devel@...hat.com,
	Steven Whitehouse <swhiteho@...hat.com>,
	Mark Fasheh <mfasheh@...e.com>,
	Joel Becker <jlbec@...lplan.org>, ocfs2-devel@....oracle.com,
	reiserfs-devel@...r.kernel.org, Jeff Mahoney <jeffm@...e.de>,
	Dave Kleikamp <shaggy@...nel.org>,
	jfs-discussion@...ts.sourceforge.net, tytso@....edu,
	viro@...iv.linux.org.uk, Jan Kara <jack@...e.cz>
Subject: [PATCH 2/2] printk: Debug patch 2

Signed-off-by: Jan Kara <jack@...e.cz>
---
 kernel/printk/printk.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index a39f4129f848..00a9ad5c2708 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -1718,17 +1718,19 @@ asmlinkage int vprintk_emit(int facility, int level,
 
 	logbuf_cpu = UINT_MAX;
 	raw_spin_unlock(&logbuf_lock);
-	local_irq_restore(flags);
-
-	/* If called from the scheduler, we can not call up(). */
-	if (in_sched)
-		return printed_len;
-
 	/*
 	 * Disable preemption to avoid being preempted while holding
 	 * console_sem which would prevent anyone from printing to console
 	 */
 	preempt_disable();
+	local_irq_restore(flags);
+
+	/* If called from the scheduler, we can not call up(). */
+	if (in_sched) {
+		preempt_enable();
+		return printed_len;
+	}
+
 	/*
 	 * Try to acquire and then immediately release the console semaphore.
 	 * The release will print out buffers and wake up /dev/kmsg and syslog()
-- 
1.8.1.4

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