um: deadlock in line_write_interrupt()

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

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/um/drivers/line.c b/arch/um/drivers/line.c
index 4a3c853689a3..4ab0d9c0911c 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;