fd 0 is a valid fd number

Do not use 0 to indicate that the fd is uninitialized; use -1 instead.

1 files changed, 4 insertions, 4 deletions

diff --git a/bmm_lib.c b/bmm_lib.c
index 073b213..c4d56f6 100644
--- a/bmm_lib.c
+++ b/bmm_lib.c
@@ -29,12 +29,12 @@
   #define pr_debug(fmt, arg...) do { } while(0)
 #endif
 
-static int bmm_fd = 0;
+static int bmm_fd = -1;
 
 int bmm_init()
 {
         /* attempt to open the BMM driver */
-	if(bmm_fd <= 0)
+	if(bmm_fd < 0)
 		bmm_fd = open(BMM_DEVICE_FILE, O_RDWR);
 
 	/* if the open failed, try to mount the driver */
@@ -50,9 +50,9 @@ int bmm_init()
 
 void bmm_exit()
 {
-	if(bmm_fd > 0)
+	if(bmm_fd >= 0)
 		close(bmm_fd);
-	bmm_fd = 0;
+	bmm_fd = -1;
 }
 
 void *bmm_malloc(unsigned long size, int attr)