[PATCH 4/5] globalvar: Allow NULL pointers to be returned by dev_add_param()

[Christian Eggers]

The following commit will change the return value of dev_add_param()
from -ENOSYS to NULL if CONFIG_PARAMETER is disabled. After that,
building without CONFIG_PARAMETER will return a NULL pointer to
__nvvar_add() instead of an error.

Signed-off-by: Christian Eggers <cegg...@arri.de>
---
 common/globalvar.c | 19 +++++++++++--------
 1 file changed, 11 insertions(+), 8 deletions(-)

diff --git a/common/globalvar.c b/common/globalvar.c
index cec0a9cc4..8dcbc04bd 100644
--- a/common/globalvar.c
+++ b/common/globalvar.c
@@ -166,21 +166,24 @@ static int nvvar_device_dispatch(const char *name, struct 
device_d **dev,
        return 1;
 }
 
-static int nv_set(struct device_d *dev, struct param_d *p, const char *val)
+static int nv_set(struct device_d *dev, struct param_d *p, const char *name, 
const char *val)
 {
        int ret;
 
        if (!val) {
-               free(p->value);
+               if (p)
+                       free(p->value);
                return 0;
        }
 
-       ret = dev_set_param(&global_device, p->name, val);
+       ret = dev_set_param(&global_device, name, val);
        if (ret)
                return ret;
 
-       free(p->value);
-       p->value = xstrdup(val);
+       if (p) {
+               free(p->value);
+               p->value = xstrdup(val);
+       }
 
        return 0;
 }
@@ -194,7 +197,7 @@ static int nv_param_set(struct device_d *dev, struct 
param_d *p, const char *val
 {
        int ret;
 
-       ret = nv_set(dev, p, val);
+       ret = nv_set(dev, p, p->name, val);
        if (ret)
                return ret;
 
@@ -225,7 +228,7 @@ static int __nvvar_add(const char *name, const char *value)
                return ret;
 
        if (value)
-               return nv_set(&nv_device, p, value);
+               return nv_set(&nv_device, p, name, value);
 
        ret = nvvar_device_dispatch(name, &dev, &pname);
        if (ret > 0)
@@ -233,7 +236,7 @@ static int __nvvar_add(const char *name, const char *value)
        else
                value = dev_get_param(&global_device, name);
 
-       if (value) {
+       if (value && p) {
                free(p->value);
                p->value = xstrdup(value);
        }
-- 
Christian Eggers
Embedded software developer

Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: 
HRA 57918
Persoenlich haftender Gesellschafter: Arnold & Richter Cine Technik GmbH
Sitz: Muenchen - Registergericht: Amtsgericht Muenchen - Handelsregisternummer: 
HRB 54477
Geschaeftsfuehrer: Dr. Michael Neuhaeuser; Stephan Schenk; Walter Trauninger; 
Markus Zeiler


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