mtd: mtd_nandecctest: add no corruption test

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=ccaa67956cfef80776d72d134467235f0055c863
Commit:     ccaa67956cfef80776d72d134467235f0055c863
Parent:     6060fb42a0bf93015d05c1a857b94894936f40ee
Author:     Akinobu Mita <akinobu.mita at gmail.com>
AuthorDate: Sat Sep 8 01:48:08 2012 +0900
Committer:  David Woodhouse <David.Woodhouse at intel.com>
CommitDate: Sat Sep 29 15:47:45 2012 +0100

    mtd: mtd_nandecctest: add no corruption test
    
    This adds no corruptin test case listed below:
    
    Prepare data block and ECC data with no corruption, and verify that
    the data block is preserved by __nand_correct_data()
    
    Signed-off-by: Akinobu Mita <akinobu.mita at gmail.com>
    Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
    Signed-off-by: David Woodhouse <David.Woodhouse at intel.com>
---
 drivers/mtd/tests/mtd_nandecctest.c |   26 ++++++++++++++++++++++++++
 1 files changed, 26 insertions(+), 0 deletions(-)

diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index 204f796ed..ff97b10 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -48,6 +48,27 @@ static void single_bit_error_data(void *error_data, void *correct_data,
 	__change_bit_le(offset, error_data);
 }
 
+static void no_bit_error(void *error_data, void *error_ecc,
+		void *correct_data, void *correct_ecc, const size_t size)
+{
+	memcpy(error_data, correct_data, size);
+	memcpy(error_ecc, correct_ecc, 3);
+}
+
+static int no_bit_error_verify(void *error_data, void *error_ecc,
+				void *correct_data, const size_t size)
+{
+	unsigned char calc_ecc[3];
+	int ret;
+
+	__nand_calculate_ecc(error_data, size, calc_ecc);
+	ret = __nand_correct_data(error_data, error_ecc, calc_ecc, size);
+	if (ret == 0 && !memcmp(correct_data, error_data, size))
+		return 0;
+
+	return -EINVAL;
+}
+
 static void single_bit_error_in_data(void *error_data, void *error_ecc,
 		void *correct_data, void *correct_ecc, const size_t size)
 {
@@ -71,6 +92,11 @@ static int single_bit_error_correct(void *error_data, void *error_ecc,
 
 static const struct nand_ecc_test nand_ecc_test[] = {
 	{
+		.name = "no-bit-error",
+		.prepare = no_bit_error,
+		.verify = no_bit_error_verify,
+	},
+	{
 		.name = "single-bit-error-in-data-correct",
 		.prepare = single_bit_error_in_data,
 		.verify = single_bit_error_correct,