kfifo: add explicit error checking in all the examples

[net-next-2.6.git] / samples / kfifo / inttype-example.c

diff --git a/samples/kfifo/inttype-example.c b/samples/kfifo/inttype-example.c
index d6c5b7d9df64ada598c500bc2e1293200fffe006..71b2aabca96aa4d41af62d391a5b6f620fbd6d51 100644 (file)
--- a/samples/kfifo/inttype-example.c
+++ b/samples/kfifo/inttype-example.c
@@ -44,10 +44,17 @@ static DECLARE_KFIFO_PTR(test, int);
 static DEFINE_KFIFO(test, int, FIFO_SIZE);
 #endif
 
+static const int expected_result[FIFO_SIZE] = {
+        3,  4,  5,  6,  7,  8,  9,  0,
+        1, 20, 21, 22, 23, 24, 25, 26,
+       27, 28, 29, 30, 31, 32, 33, 34,
+       35, 36, 37, 38, 39, 40, 41, 42,
+};
+
 static int __init testfunc(void)
 {
        int             buf[6];
-       int             i;
+       int             i, j;
        unsigned int    ret;
 
        printk(KERN_INFO "int fifo test start\n");
@@ -66,8 +73,13 @@ static int __init testfunc(void)
        ret = kfifo_in(&test, buf, ret);
        printk(KERN_INFO "ret: %d\n", ret);
 
-       for (i = 20; i != 30; i++)
-               kfifo_put(&test, &i);
+       /* skip first element of the fifo */
+       printk(KERN_INFO "skip 1st element\n");
+       kfifo_skip(&test);
+
+       /* put values into the fifo until is full */
+       for (i = 20; kfifo_put(&test, &i); i++)
+               ;
 
        printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
 
@@ -75,10 +87,20 @@ static int __init testfunc(void)
        if (kfifo_peek(&test, &i))
                printk(KERN_INFO "%d\n", i);
 
-       /* print out all values in the fifo */
-       while (kfifo_get(&test, &i))
-               printk("%d ", i);
-       printk("\n");
+       /* check the correctness of all values in the fifo */
+       j = 0;
+       while (kfifo_get(&test, &i)) {
+               printk(KERN_INFO "item = %d\n", i);
+               if (i != expected_result[j++]) {
+                       printk(KERN_WARNING "value mismatch: test failed\n");
+                       return -EIO;
+               }
+       }
+       if (j != ARRAY_SIZE(expected_result)) {
+               printk(KERN_WARNING "size mismatch: test failed\n");
+               return -EIO;
+       }
+       printk(KERN_INFO "test passed\n");
 
        return 0;
 }
@@ -132,7 +154,12 @@ static int __init example_init(void)
                return ret;
        }
 #endif
-       testfunc();
+       if (testfunc() < 0) {
+#ifdef DYNAMIC
+               kfifo_free(&test);
+#endif
+               return -EIO;
+       }
 
        if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) {
 #ifdef DYNAMIC