1 files changed, 3 insertions, 1 deletions

diff --git a/drivers/macintosh/smu.c b/drivers/macintosh/smu.c
index 888448cf7f1f..c9da5c4c167d 100644
--- a/drivers/macintosh/smu.c
+++ b/drivers/macintosh/smu.c
@@ -1183,8 +1183,10 @@ static ssize_t smu_read_command(struct file *file, struct smu_private *pp,
                 return -EOVERFLOW;
         spin_lock_irqsave(&pp->lock, flags);
         if (pp->cmd.status == 1) {
-                if (file->f_flags & O_NONBLOCK)
+                if (file->f_flags & O_NONBLOCK) {
+                        spin_unlock_irqrestore(&pp->lock, flags);
                         return -EAGAIN;
+                }
                 add_wait_queue(&pp->wait, &wait);
                 for (;;) {
                         set_current_state(TASK_INTERRUPTIBLE);