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authorAndrea Righi <arighi@develer.com>2010-08-19 17:13:30 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-08-20 12:34:54 -0400
commita25effa4d265eb5028c7d4a92a0ddd9267c3c43d (patch)
tree207c392483a80d7b21fdb92289c5c1b3e49c961a
parentd83a71c4219191a9a881318ae5ca9b39aa1d0540 (diff)
kfifo: add explicit error checking in all the examples
Provide a check in all the kfifo examples to validate the correct execution of each testcase. Signed-off-by: Andrea Righi <arighi@develer.com> Acked-by: Stefani Seibold <stefani@seibold.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat
-rw-r--r--samples/kfifo/bytestream-example.c7
-rw-r--r--samples/kfifo/dma-example.c106
-rw-r--r--samples/kfifo/inttype-example.c43
-rw-r--r--samples/kfifo/record-example.c39
4 files changed, 144 insertions, 51 deletions
diff --git a/samples/kfifo/bytestream-example.c b/samples/kfifo/bytestream-example.c
index a94e6948b30d..178061e87ffe 100644
--- a/samples/kfifo/bytestream-example.c
+++ b/samples/kfifo/bytestream-example.c
@@ -44,7 +44,7 @@ static struct kfifo test;
44static DECLARE_KFIFO(test, unsigned char, FIFO_SIZE); 44static DECLARE_KFIFO(test, unsigned char, FIFO_SIZE);
45#endif 45#endif
46 46
47static unsigned char expected_result[FIFO_SIZE] = { 47static const unsigned char expected_result[FIFO_SIZE] = {
48 3, 4, 5, 6, 7, 8, 9, 0, 48 3, 4, 5, 6, 7, 8, 9, 0,
49 1, 20, 21, 22, 23, 24, 25, 26, 49 1, 20, 21, 22, 23, 24, 25, 26,
50 27, 28, 29, 30, 31, 32, 33, 34, 50 27, 28, 29, 30, 31, 32, 33, 34,
@@ -90,9 +90,14 @@ static int __init testfunc(void)
90 90
91 printk(KERN_INFO "queue len: %u\n", kfifo_len(&test)); 91 printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
92 92
93 /* show the first value without removing from the fifo */
94 if (kfifo_peek(&test, &i))
95 printk(KERN_INFO "%d\n", i);
96
93 /* check the correctness of all values in the fifo */ 97 /* check the correctness of all values in the fifo */
94 j = 0; 98 j = 0;
95 while (kfifo_get(&test, &i)) { 99 while (kfifo_get(&test, &i)) {
100 printk(KERN_INFO "item = %d\n", i);
96 if (i != expected_result[j++]) { 101 if (i != expected_result[j++]) {
97 printk(KERN_WARNING "value mismatch: test failed\n"); 102 printk(KERN_WARNING "value mismatch: test failed\n");
98 return -EIO; 103 return -EIO;
diff --git a/samples/kfifo/dma-example.c b/samples/kfifo/dma-example.c
index 3682278785f7..ee03a4f0b64f 100644
--- a/samples/kfifo/dma-example.c
+++ b/samples/kfifo/dma-example.c
@@ -29,8 +29,8 @@ static int __init example_init(void)
29 printk(KERN_INFO "DMA fifo test start\n"); 29 printk(KERN_INFO "DMA fifo test start\n");
30 30
31 if (kfifo_alloc(&fifo, FIFO_SIZE, GFP_KERNEL)) { 31 if (kfifo_alloc(&fifo, FIFO_SIZE, GFP_KERNEL)) {
32 printk(KERN_ERR "error kfifo_alloc\n"); 32 printk(KERN_WARNING "error kfifo_alloc\n");
33 return 1; 33 return -ENOMEM;
34 } 34 }
35 35
36 printk(KERN_INFO "queue size: %u\n", kfifo_size(&fifo)); 36 printk(KERN_INFO "queue size: %u\n", kfifo_size(&fifo));
@@ -41,65 +41,93 @@ static int __init example_init(void)
41 kfifo_put(&fifo, &i); 41 kfifo_put(&fifo, &i);
42 42
43 /* kick away first byte */ 43 /* kick away first byte */
44 ret = kfifo_get(&fifo, &i); 44 kfifo_skip(&fifo);
45 45
46 printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo)); 46 printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo));
47 47
48 /*
49 * Configure the kfifo buffer to receive data from DMA input.
50 *
51 * .--------------------------------------.
52 * | 0 | 1 | 2 | ... | 12 | 13 | ... | 31 |
53 * |---|------------------|---------------|
54 * \_/ \________________/ \_____________/
55 * \ \ \
56 * \ \_allocated data \
57 * \_*free space* \_*free space*
58 *
59 * We need two different SG entries: one for the free space area at the
60 * end of the kfifo buffer (19 bytes) and another for the first free
61 * byte at the beginning, after the kfifo_skip().
62 */
48 sg_init_table(sg, ARRAY_SIZE(sg)); 63 sg_init_table(sg, ARRAY_SIZE(sg));
49 ret = kfifo_dma_in_prepare(&fifo, sg, ARRAY_SIZE(sg), FIFO_SIZE); 64 ret = kfifo_dma_in_prepare(&fifo, sg, ARRAY_SIZE(sg), FIFO_SIZE);
50 printk(KERN_INFO "DMA sgl entries: %d\n", ret); 65 printk(KERN_INFO "DMA sgl entries: %d\n", ret);
66 if (!ret) {
67 /* fifo is full and no sgl was created */
68 printk(KERN_WARNING "error kfifo_dma_in_prepare\n");
69 return -EIO;
70 }
51 71
52 /* if 0 was returned, fifo is full and no sgl was created */ 72 /* receive data */
53 if (ret) { 73 printk(KERN_INFO "scatterlist for receive:\n");
54 printk(KERN_INFO "scatterlist for receive:\n"); 74 for (i = 0; i < ARRAY_SIZE(sg); i++) {
55 for (i = 0; i < ARRAY_SIZE(sg); i++) { 75 printk(KERN_INFO
56 printk(KERN_INFO 76 "sg[%d] -> "
57 "sg[%d] -> " 77 "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n",
58 "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n", 78 i, sg[i].page_link, sg[i].offset, sg[i].length);
59 i, sg[i].page_link, sg[i].offset, sg[i].length);
60 79
61 if (sg_is_last(&sg[i])) 80 if (sg_is_last(&sg[i]))
62 break; 81 break;
63 } 82 }
64 83
65 /* but here your code to setup and exectute the dma operation */ 84 /* put here your code to setup and exectute the dma operation */
66 /* ... */ 85 /* ... */
67 86
68 /* example: zero bytes received */ 87 /* example: zero bytes received */
69 ret = 0; 88 ret = 0;
70 89
71 /* finish the dma operation and update the received data */ 90 /* finish the dma operation and update the received data */
72 kfifo_dma_in_finish(&fifo, ret); 91 kfifo_dma_in_finish(&fifo, ret);
73 }
74 92
93 /* Prepare to transmit data, example: 8 bytes */
75 ret = kfifo_dma_out_prepare(&fifo, sg, ARRAY_SIZE(sg), 8); 94 ret = kfifo_dma_out_prepare(&fifo, sg, ARRAY_SIZE(sg), 8);
76 printk(KERN_INFO "DMA sgl entries: %d\n", ret); 95 printk(KERN_INFO "DMA sgl entries: %d\n", ret);
96 if (!ret) {
97 /* no data was available and no sgl was created */
98 printk(KERN_WARNING "error kfifo_dma_out_prepare\n");
99 return -EIO;
100 }
77 101
78 /* if 0 was returned, no data was available and no sgl was created */ 102 printk(KERN_INFO "scatterlist for transmit:\n");
79 if (ret) { 103 for (i = 0; i < ARRAY_SIZE(sg); i++) {
80 printk(KERN_INFO "scatterlist for transmit:\n"); 104 printk(KERN_INFO
81 for (i = 0; i < ARRAY_SIZE(sg); i++) { 105 "sg[%d] -> "
82 printk(KERN_INFO 106 "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n",
83 "sg[%d] -> " 107 i, sg[i].page_link, sg[i].offset, sg[i].length);
84 "page_link 0x%.8lx offset 0x%.8x length 0x%.8x\n",
85 i, sg[i].page_link, sg[i].offset, sg[i].length);
86 108
87 if (sg_is_last(&sg[i])) 109 if (sg_is_last(&sg[i]))
88 break; 110 break;
89 } 111 }
90 112
91 /* but here your code to setup and exectute the dma operation */ 113 /* put here your code to setup and exectute the dma operation */
92 /* ... */ 114 /* ... */
93 115
94 /* example: 5 bytes transmitted */ 116 /* example: 5 bytes transmitted */
95 ret = 5; 117 ret = 5;
96 118
97 /* finish the dma operation and update the transmitted data */ 119 /* finish the dma operation and update the transmitted data */
98 kfifo_dma_out_finish(&fifo, ret); 120 kfifo_dma_out_finish(&fifo, ret);
99 }
100 121
122 ret = kfifo_len(&fifo);
101 printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo)); 123 printk(KERN_INFO "queue len: %u\n", kfifo_len(&fifo));
102 124
125 if (ret != 7) {
126 printk(KERN_WARNING "size mismatch: test failed");
127 return -EIO;
128 }
129 printk(KERN_INFO "test passed\n");
130
103 return 0; 131 return 0;
104} 132}
105 133
diff --git a/samples/kfifo/inttype-example.c b/samples/kfifo/inttype-example.c
index d6c5b7d9df64..71b2aabca96a 100644
--- a/samples/kfifo/inttype-example.c
+++ b/samples/kfifo/inttype-example.c
@@ -44,10 +44,17 @@ static DECLARE_KFIFO_PTR(test, int);
44static DEFINE_KFIFO(test, int, FIFO_SIZE); 44static DEFINE_KFIFO(test, int, FIFO_SIZE);
45#endif 45#endif
46 46
47static const int expected_result[FIFO_SIZE] = {
48 3, 4, 5, 6, 7, 8, 9, 0,
49 1, 20, 21, 22, 23, 24, 25, 26,
50 27, 28, 29, 30, 31, 32, 33, 34,
51 35, 36, 37, 38, 39, 40, 41, 42,
52};
53
47static int __init testfunc(void) 54static int __init testfunc(void)
48{ 55{
49 int buf[6]; 56 int buf[6];
50 int i; 57 int i, j;
51 unsigned int ret; 58 unsigned int ret;
52 59
53 printk(KERN_INFO "int fifo test start\n"); 60 printk(KERN_INFO "int fifo test start\n");
@@ -66,8 +73,13 @@ static int __init testfunc(void)
66 ret = kfifo_in(&test, buf, ret); 73 ret = kfifo_in(&test, buf, ret);
67 printk(KERN_INFO "ret: %d\n", ret); 74 printk(KERN_INFO "ret: %d\n", ret);
68 75
69 for (i = 20; i != 30; i++) 76 /* skip first element of the fifo */
70 kfifo_put(&test, &i); 77 printk(KERN_INFO "skip 1st element\n");
78 kfifo_skip(&test);
79
80 /* put values into the fifo until is full */
81 for (i = 20; kfifo_put(&test, &i); i++)
82 ;
71 83
72 printk(KERN_INFO "queue len: %u\n", kfifo_len(&test)); 84 printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
73 85
@@ -75,10 +87,20 @@ static int __init testfunc(void)
75 if (kfifo_peek(&test, &i)) 87 if (kfifo_peek(&test, &i))
76 printk(KERN_INFO "%d\n", i); 88 printk(KERN_INFO "%d\n", i);
77 89
78 /* print out all values in the fifo */ 90 /* check the correctness of all values in the fifo */
79 while (kfifo_get(&test, &i)) 91 j = 0;
80 printk("%d ", i); 92 while (kfifo_get(&test, &i)) {
81 printk("\n"); 93 printk(KERN_INFO "item = %d\n", i);
94 if (i != expected_result[j++]) {
95 printk(KERN_WARNING "value mismatch: test failed\n");
96 return -EIO;
97 }
98 }
99 if (j != ARRAY_SIZE(expected_result)) {
100 printk(KERN_WARNING "size mismatch: test failed\n");
101 return -EIO;
102 }
103 printk(KERN_INFO "test passed\n");
82 104
83 return 0; 105 return 0;
84} 106}
@@ -132,7 +154,12 @@ static int __init example_init(void)
132 return ret; 154 return ret;
133 } 155 }
134#endif 156#endif
135 testfunc(); 157 if (testfunc() < 0) {
158#ifdef DYNAMIC
159 kfifo_free(&test);
160#endif
161 return -EIO;
162 }
136 163
137 if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) { 164 if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) {
138#ifdef DYNAMIC 165#ifdef DYNAMIC
diff --git a/samples/kfifo/record-example.c b/samples/kfifo/record-example.c
index 32c6e0bda744..e68bd16a5da4 100644
--- a/samples/kfifo/record-example.c
+++ b/samples/kfifo/record-example.c
@@ -55,6 +55,19 @@ typedef STRUCT_KFIFO_REC_1(FIFO_SIZE) mytest;
55static mytest test; 55static mytest test;
56#endif 56#endif
57 57
58static const char *expected_result[] = {
59 "a",
60 "bb",
61 "ccc",
62 "dddd",
63 "eeeee",
64 "ffffff",
65 "ggggggg",
66 "hhhhhhhh",
67 "iiiiiiiii",
68 "jjjjjjjjjj",
69};
70
58static int __init testfunc(void) 71static int __init testfunc(void)
59{ 72{
60 char buf[100]; 73 char buf[100];
@@ -75,6 +88,10 @@ static int __init testfunc(void)
75 kfifo_in(&test, buf, i + 1); 88 kfifo_in(&test, buf, i + 1);
76 } 89 }
77 90
91 /* skip first element of the fifo */
92 printk(KERN_INFO "skip 1st element\n");
93 kfifo_skip(&test);
94
78 printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test)); 95 printk(KERN_INFO "fifo len: %u\n", kfifo_len(&test));
79 96
80 /* show the first record without removing from the fifo */ 97 /* show the first record without removing from the fifo */
@@ -82,11 +99,22 @@ static int __init testfunc(void)
82 if (ret) 99 if (ret)
83 printk(KERN_INFO "%.*s\n", ret, buf); 100 printk(KERN_INFO "%.*s\n", ret, buf);
84 101
85 /* print out all records in the fifo */ 102 /* check the correctness of all values in the fifo */
103 i = 0;
86 while (!kfifo_is_empty(&test)) { 104 while (!kfifo_is_empty(&test)) {
87 ret = kfifo_out(&test, buf, sizeof(buf)); 105 ret = kfifo_out(&test, buf, sizeof(buf));
88 printk(KERN_INFO "%.*s\n", ret, buf); 106 buf[ret] = '\0';
107 printk(KERN_INFO "item = %.*s\n", ret, buf);
108 if (strcmp(buf, expected_result[i++])) {
109 printk(KERN_WARNING "value mismatch: test failed\n");
110 return -EIO;
111 }
112 }
113 if (i != ARRAY_SIZE(expected_result)) {
114 printk(KERN_WARNING "size mismatch: test failed\n");
115 return -EIO;
89 } 116 }
117 printk(KERN_INFO "test passed\n");
90 118
91 return 0; 119 return 0;
92} 120}
@@ -142,7 +170,12 @@ static int __init example_init(void)
142#else 170#else
143 INIT_KFIFO(test); 171 INIT_KFIFO(test);
144#endif 172#endif
145 testfunc(); 173 if (testfunc() < 0) {
174#ifdef DYNAMIC
175 kfifo_free(&test);
176#endif
177 return -EIO;
178 }
146 179
147 if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) { 180 if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) {
148#ifdef DYNAMIC 181#ifdef DYNAMIC
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