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authorAndrea Righi <arighi@develer.com>2010-08-19 14:13:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-20 09:34:54 -0700
commit2aaf2092c168fc02df0645415f524b357ee7ec2e (patch)
tree998b8c3f82abb46a5a1c297a20ea0d5c4a7c0408 /samples
parent5ddf83912c8b49a24ab0841f6d77f33781dcf10f (diff)
downloadlinux-2aaf2092c168fc02df0645415f524b357ee7ec2e.tar.gz
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.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/samples/kfifo/bytestream-example.c b/samples/kfifo/bytestream-example.c
index 2e3a7a8128a..a94e6948b30 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