altos/stm: use 0xff for dma mutex value for allocated mutexes

[fw/altos] / src / stm / ao_dma_stm.c

diff --git a/src/stm/ao_dma_stm.c b/src/stm/ao_dma_stm.c
index 298a15b5ce58bdd4d67fbe69293c96d22e4dcbc3..93b7fb47e1da815545d843cc2ae4838e65759264 100644 (file)
--- a/src/stm/ao_dma_stm.c
+++ b/src/stm/ao_dma_stm.c
@@ -64,7 +64,7 @@ ao_dma_set_transfer(uint8_t           index,
        if (ao_dma_allocated[index]) {
                if (ao_dma_mutex[index])
                        ao_panic(AO_PANIC_DMA);
-               ao_dma_mutex[index] = 1;
+               ao_dma_mutex[index] = 0xff;
        } else
                ao_mutex_get(&ao_dma_mutex[index]);
        ao_arch_critical(