diff --git a/kernel-src/io/acpi/dev.c b/kernel-src/io/acpi/dev.c
index d83edb68..73e604fc 100644
--- a/kernel-src/io/acpi/dev.c
+++ b/kernel-src/io/acpi/dev.c
@@ -112,5 +112,6 @@ static devops_t acpiops = {
 void acpi_initdevice(void) {
 	__assert(devfs_register(&acpiops, "acpi", V_TYPE_CHDEV, DEV_MAJOR_ACPI, 0, 0600, NULL) == 0);
 	__assert(ringbuffer_init(&ringbuffer, 64) == 0);
+	MUTEX_INIT(&mutex);
 	POLL_INITHEADER(&pollheader);
 }
diff --git a/kernel-src/io/tty.c b/kernel-src/io/tty.c
index 01825c64..870125c3 100644
--- a/kernel-src/io/tty.c
+++ b/kernel-src/io/tty.c
@@ -256,14 +256,15 @@ static int read(int minor, iovec_iterator_t *iovec_iterator, size_t size, uintma
 		}
 
 		error = poll_dowait(&desc, effectivetimeout);
+
+		poll_leave(&desc);
+		poll_destroydesc(&desc);
+
 		if (error == 0 && (desc.event == NULL || (desc.event && desc.event->revents == 0))) {
 			// timed out!
 			break;
 		}
 
-		poll_leave(&desc);
-		poll_destroydesc(&desc);
-
 		if (error)
 			goto leave;
 	}