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| author | Andrea Righi <arighi@develer.com> | 2010-08-19 14:13:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-20 09:34:54 -0700 |
| commit | 2aaf2092c168fc02df0645415f524b357ee7ec2e (patch) | |
| tree | 998b8c3f82abb46a5a1c297a20ea0d5c4a7c0408 /samples | |
| parent | 5ddf83912c8b49a24ab0841f6d77f33781dcf10f (diff) | |
| download | lwn-2aaf2092c168fc02df0645415f524b357ee7ec2e.tar.gz lwn-2aaf2092c168fc02df0645415f524b357ee7ec2e.zip | |
kfifo: add explicit error checking in byte stream example
Provide a static array of expected items that kfifo should contain at the
end of the test to validate it.
Signed-off-by: Andrea Righi <arighi@develer.com>
Cc: Stefani Seibold <stefani@seibold.net>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'samples')
| -rw-r--r-- | samples/kfifo/bytestream-example.c | 33 |
1 files changed, 27 insertions, 6 deletions
diff --git a/samples/kfifo/bytestream-example.c b/samples/kfifo/bytestream-example.c index 2e3a7a8128a2..a94e6948b30d 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 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"); @@ -83,10 +90,19 @@ static int __init testfunc(void) 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"); + /* check the correctness of all values in the fifo */ + j = 0; + while (kfifo_get(&test, &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; } @@ -142,7 +158,12 @@ 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 |