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Diffstat (limited to 'drivers/thunderbolt/dma_port.c')
-rw-r--r--drivers/thunderbolt/dma_port.c28
1 files changed, 13 insertions, 15 deletions
diff --git a/drivers/thunderbolt/dma_port.c b/drivers/thunderbolt/dma_port.c
index af6dde347bee..f2701194f810 100644
--- a/drivers/thunderbolt/dma_port.c
+++ b/drivers/thunderbolt/dma_port.c
@@ -170,24 +170,22 @@ static int dma_port_write(struct tb_ctl *ctl, const void *buffer, u64 route,
static int dma_find_port(struct tb_switch *sw)
{
- int port, ret;
- u32 type;
+ static const int ports[] = { 3, 5, 7 };
+ int i;
/*
- * The DMA (NHI) port is either 3 or 5 depending on the
- * controller. Try both starting from 5 which is more common.
+ * The DMA (NHI) port is either 3, 5 or 7 depending on the
+ * controller. Try all of them.
*/
- port = 5;
- ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1,
- DMA_PORT_TIMEOUT);
- if (!ret && (type & 0xffffff) == TB_TYPE_NHI)
- return port;
-
- port = 3;
- ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), port, 2, 1,
- DMA_PORT_TIMEOUT);
- if (!ret && (type & 0xffffff) == TB_TYPE_NHI)
- return port;
+ for (i = 0; i < ARRAY_SIZE(ports); i++) {
+ u32 type;
+ int ret;
+
+ ret = dma_port_read(sw->tb->ctl, &type, tb_route(sw), ports[i],
+ 2, 1, DMA_PORT_TIMEOUT);
+ if (!ret && (type & 0xffffff) == TB_TYPE_NHI)
+ return ports[i];
+ }
return -ENODEV;
}