ISDN: Add check for return value of pnp_activate_dev()

pnp_activate_dev() return value needs to be checked to make sure that
following calls calls to the PNP functions do work correctly.
Fix for report #44491 on bugzilla.kernel.org.

Signed-off-by: Karsten Keil <kkeil@linux-pingi.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/isdn/hisax/isurf.c b/drivers/isdn/hisax/isurf.c
index ea2717215296..c1530fe248c2 100644
--- a/drivers/isdn/hisax/isurf.c
+++ b/drivers/isdn/hisax/isurf.c
@@ -231,6 +231,11 @@ setup_isurf(struct IsdnCard *card)
                                 }
                                 pnp_disable_dev(pnp_d);
                                 err = pnp_activate_dev(pnp_d);
+                                if (err < 0) {
+                                        pr_warn("%s: pnp_activate_dev ret=%d\n",
+                                                __func__, err);
+                                        return 0;
+                                }
                                 cs->hw.isurf.reset = pnp_port_start(pnp_d, 0);
                                 cs->hw.isurf.phymem = pnp_mem_start(pnp_d, 1);
                                 cs->irq = pnp_irq(pnp_d, 0);