From: Al Viro <viro@zeniv.linux.org.uk>
Date: Sat, 11 Feb 2012 08:05:32 +0000 (-0500)
Subject: um: deadlock in line_write_interrupt()
X-Git-Tag: v3.4-rc1~81^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=199eebbae45791af0f37184dd495f16a6cf5c34a;p=platform%2Fkernel%2Flinux-exynos.git

um: deadlock in line_write_interrupt()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 4a3c853..4ab0d9c 100644
--- a/arch/um/drivers/line.c
+++ b/arch/um/drivers/line.c
@@ -344,6 +344,7 @@ static irqreturn_t line_write_interrupt(int irq, void *data)
 	spin_lock(&line->lock);
 	err = flush_buffer(line);
 	if (err == 0) {
+		spin_unlock(&line->lock);
 		return IRQ_NONE;
 	} else if (err < 0) {
 		line->head = line->buffer;