diff options
Diffstat (limited to 'samples/kfifo/bytestream-example.c')
| -rw-r--r-- | samples/kfifo/bytestream-example.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/samples/kfifo/bytestream-example.c b/samples/kfifo/bytestream-example.c index 642eef3f6336..178061e87ffe 100644 --- a/samples/kfifo/bytestream-example.c +++ b/samples/kfifo/bytestream-example.c @@ -44,10 +44,17 @@ static struct kfifo test; static DECLARE_KFIFO(test, unsigned char, FIFO_SIZE); #endif +static const unsigned char 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) { unsigned char buf[6]; - unsigned char i; + unsigned char i, j; unsigned int ret; printk(KERN_INFO "byte stream fifo test start\n"); @@ -73,16 +80,34 @@ static int __init testfunc(void) ret = kfifo_in(&test, buf, ret); printk(KERN_INFO "ret: %d\n", ret); + /* 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)); - /* print out all values in the fifo */ - while (kfifo_get(&test, &i)) - printk("%d ", i); - printk("\n"); + /* show the first value without removing from the fifo */ + if (kfifo_peek(&test, &i)) + printk(KERN_INFO "%d\n", i); + + /* 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; } @@ -138,7 +163,12 @@ static int __init example_init(void) #else INIT_KFIFO(test); #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 |