[PATCH] selftests/android/ion: fix heap_type may be uninitialized

[Anders Roxell]

gcc warns that 'heap_type' is not initialized if we don't come through
any of the two 'case' statesments before:

ionapp_export.c:91:2: warning: ‘heap_type’ may be used uninitialized in
this function [-Wmaybe-uninitialized]
  printf("heap_type: %ld, heap_size: %ld\n", heap_type, heap_size);
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

In the current code, we initialize the heap_type to -1 before the 'case'
statements. We also change the print_usage function to state that
heap_type and heap_size isn't optional, they are mandatory.

Fixes: 47a18c42d992 ("android/ion: userspace test utility for ion buffer 
sharing")
Signed-off-by: Anders Roxell <anders.rox...@linaro.org>
---
 .../testing/selftests/android/ion/ionapp_export.c  | 23 +++++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/android/ion/ionapp_export.c 
b/tools/testing/selftests/android/ion/ionapp_export.c
index a944e72621a9..b42f803e9d2a 100644
--- a/tools/testing/selftests/android/ion/ionapp_export.c
+++ b/tools/testing/selftests/android/ion/ionapp_export.c
@@ -31,16 +31,24 @@
 
 void print_usage(int argc, char *argv[])
 {
-       printf("Usage: %s [-h <help>] [-i <heap id>] [-s <size in bytes>]\n",
+       printf("Usage: %s [-h <help>] -i <heap id> -s <size in bytes>\n",
                argv[0]);
 }
 
+void heap_type_error_text(void)
+{
+       printf("heap_type must be specified\n");
+       printf("  need to specify -i <heap_type>\n");
+       printf("  supported heap types 0 or 1\n");
+}
+
 int main(int argc, char *argv[])
 {
        int opt, ret, status, heapid;
        int sockfd, client_fd, shared_fd;
        unsigned char *map_buf;
-       unsigned long map_len, heap_type, heap_size, flags;
+       unsigned long map_len, heap_size, flags;
+       long heap_type;
        struct ion_buffer_info info;
        struct socket_info skinfo;
 
@@ -50,6 +58,7 @@ int main(int argc, char *argv[])
        }
 
        heap_size = 0;
+       heap_type = -1;
        flags = 0;
 
        while ((opt = getopt(argc, argv, "hi:s:")) != -1) {
@@ -68,7 +77,8 @@ int main(int argc, char *argv[])
                                heap_type = ION_HEAP_TYPE_SYSTEM_CONTIG;
                                break;
                        default:
-                               printf("ERROR: heap type not supported\n");
+                               heap_type_error_text();
+                               print_usage(argc, argv);
                                exit(1);
                        }
                        break;
@@ -82,8 +92,15 @@ int main(int argc, char *argv[])
                }
        }
 
+       if (heap_type < 0) {
+               heap_type_error_text();
+               print_usage(argc, argv);
+               exit(1);
+       }
+
        if (heap_size <= 0) {
                printf("heap_size cannot be 0\n");
+               printf("  need to specify -s <heap_size>\n");
                print_usage(argc, argv);
                exit(1);
        }
-- 
2.11.0