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 (file)
--- 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;