ifpps: Reorder buffer allocation and file opening in stats_proc_interrupts

We don't need the file open to allocate the buffer so open it just
before it's used for the first time.

Signed-off-by: Tobias Klauser <tklauser@distanz.ch>

1 files changed, 4 insertions, 4 deletions

diff --git a/ifpps.c b/ifpps.c
index 6c0387b..6f50bed 100644
--- a/ifpps.c
+++ b/ifpps.c
@@ -273,13 +273,13 @@ static int stats_proc_interrupts(char *ifname, struct ifstat *stats)
 	struct ethtool_drvinfo drvinf;
 	FILE *fp;
 
-	fp = fopen("/proc/interrupts", "r");
-	if (!fp)
-		panic("Cannot open /proc/interrupts!\n");
-
 	cpus = get_number_cpus();
 	buff_len = cpus * 128;
 	buff = xmalloc(buff_len);
+
+	fp = fopen("/proc/interrupts", "r");
+	if (!fp)
+		panic("Cannot open /proc/interrupts!\n");
 retry:
 	fseek(fp, 0, SEEK_SET);
 	memset(buff, 0, buff_len);