[PATCH] fsl_ucc_hdlc: add a check of the return value from hdlc_open

[Alexandra Diupina]

Process the result of hold_open() and return it from
uhdlc_open() in case of an error
It is necessary to pass the error code up the control flow,
similar to a possible error in request_irq()

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC")
Signed-off-by: Alexandra Diupina <adiup...@astralinux.ru>
---
 drivers/net/wan/fsl_ucc_hdlc.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wan/fsl_ucc_hdlc.c b/drivers/net/wan/fsl_ucc_hdlc.c
index 47c2ad7a3e42..cdd9489c712e 100644
--- a/drivers/net/wan/fsl_ucc_hdlc.c
+++ b/drivers/net/wan/fsl_ucc_hdlc.c
@@ -708,6 +708,7 @@ static int uhdlc_open(struct net_device *dev)
        hdlc_device *hdlc = dev_to_hdlc(dev);
        struct ucc_hdlc_private *priv = hdlc->priv;
        struct ucc_tdm *utdm = priv->utdm;
+       int rc = 0;
 
        if (priv->hdlc_busy != 1) {
                if (request_irq(priv->ut_info->uf_info.irq,
@@ -731,10 +732,12 @@ static int uhdlc_open(struct net_device *dev)
                napi_enable(&priv->napi);
                netdev_reset_queue(dev);
                netif_start_queue(dev);
-               hdlc_open(dev);
+               rc = hdlc_open(dev);
+               if (rc)
+                       return rc;
        }
 
-       return 0;
+       return rc;
 }
 
 static void uhdlc_memclean(struct ucc_hdlc_private *priv)
-- 
2.30.2