dma: rcar-audmapp: Fix for no corresponding slave ID

In case of no corresponding slave ID, the audmapp_set_slave() returns
-ENXIO same as sh_dmae_set_slave() of shdmac.c.
DMAEngine might return wrong channel without this patch

Signed-off-by: Ryo Kataoka <ryo.kataoka.wt@renesas.com>
Signed-off-by: Jun Watanabe <jun.watanabe.ue@renesas.com>,
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/dma/sh/rcar-audmapp.c b/drivers/dma/sh/rcar-audmapp.c
index dabbf0aba2e9..80fd2aeb4870 100644
--- a/drivers/dma/sh/rcar-audmapp.c
+++ b/drivers/dma/sh/rcar-audmapp.c
@@ -117,7 +117,7 @@ static void audmapp_start_xfer(struct shdma_chan *schan,
         audmapp_write(auchan, chcr,     PDMACHCR);
 }
 
-static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
+static int audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
                               u32 *chcr, dma_addr_t *dst)
 {
         struct audmapp_device *audev = to_dev(auchan);
@@ -131,20 +131,22 @@ static void audmapp_get_config(struct audmapp_chan *auchan, int slave_id,
         if (!pdata) { /* DT */
                 *chcr = ((u32)slave_id) << 16;
                 auchan->shdma_chan.slave_id = (slave_id) >> 8;
-                return;
+                return 0;
         }
 
         /* non-DT */
 
         if (slave_id >= AUDMAPP_SLAVE_NUMBER)
-                return;
+                return -ENXIO;
 
         for (i = 0, cfg = pdata->slave; i < pdata->slave_num; i++, cfg++)
                 if (cfg->slave_id == slave_id) {
                         *chcr   = cfg->chcr;
                         *dst    = cfg->dst;
-                        break;
+                        return 0;
                 }
+
+        return -ENXIO;
 }
 
 static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
@@ -153,8 +155,11 @@ static int audmapp_set_slave(struct shdma_chan *schan, int slave_id,
         struct audmapp_chan *auchan = to_chan(schan);
         u32 chcr;
         dma_addr_t dst;
+        int ret;
 
-        audmapp_get_config(auchan, slave_id, &chcr, &dst);
+        ret = audmapp_get_config(auchan, slave_id, &chcr, &dst);
+        if (ret < 0)
+                return ret;
 
         if (try)
                 return 0;