[PATCH 2/2] mtd: remove extra retlen assignment
Artem Bityutskiy
dedekind1 at gmail.com
Thu Dec 29 10:47:33 EST 2011
From: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
MTD functions always assign the 'retlen' argument to 0 at the very
beginning - the callers do not have to do this.
I used the following semantic patch to find these places:
@@
identifier retlen;
expression a, b, c, d, e;
constant C;
type T;
@@
(
- retlen = C;
|
T
-retlen = C
+ retlen
;
)
... when != retlen
when exists
(
mtd_read(a, b, c, &retlen, d)
|
mtd_write(a, b, c, &retlen, d)
|
mtd_panic_write(a, b, c, &retlen, d)
|
mtd_doint(a, b, c, &retlen, d, e)
|
mtd_read_fact_prot_reg(a, b, c, &retlen, d)
|
mtd_write_user_prot_reg(a, b, c, &retlen, d)
)
I ran it twice, because there were cases of double zero assigments
in mtd tests. Then I went through the patch to verify that spatch
did not find any false positives.
Signed-off-by: Artem Bityutskiy <artem.bityutskiy at linux.intel.com>
---
drivers/mtd/mtdchar.c | 2 +-
drivers/mtd/tests/mtd_pagetest.c | 17 +++++------------
drivers/mtd/tests/mtd_readtest.c | 2 +-
drivers/mtd/tests/mtd_speedtest.c | 12 ++++++------
drivers/mtd/tests/mtd_stresstest.c | 4 ++--
drivers/mtd/tests/mtd_subpagetest.c | 14 +++++---------
drivers/mtd/tests/mtd_torturetest.c | 4 ++--
7 files changed, 22 insertions(+), 33 deletions(-)
diff --git a/drivers/mtd/mtdchar.c b/drivers/mtd/mtdchar.c
index 0a8bf82..e373e67 100644
--- a/drivers/mtd/mtdchar.c
+++ b/drivers/mtd/mtdchar.c
@@ -189,7 +189,7 @@ static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
{
struct mtd_file_info *mfi = file->private_data;
struct mtd_info *mtd = mfi->mtd;
- size_t retlen=0;
+ size_t retlen;
size_t total_retlen=0;
int ret=0;
int len;
diff --git a/drivers/mtd/tests/mtd_pagetest.c b/drivers/mtd/tests/mtd_pagetest.c
index 8024eaf..252ddb0 100644
--- a/drivers/mtd/tests/mtd_pagetest.c
+++ b/drivers/mtd/tests/mtd_pagetest.c
@@ -95,7 +95,7 @@ static int erase_eraseblock(int ebnum)
static int write_eraseblock(int ebnum)
{
int err = 0;
- size_t written = 0;
+ size_t written;
loff_t addr = ebnum * mtd->erasesize;
set_random_data(writebuf, mtd->erasesize);
@@ -111,7 +111,7 @@ static int write_eraseblock(int ebnum)
static int verify_eraseblock(int ebnum)
{
uint32_t j;
- size_t read = 0;
+ size_t read;
int err = 0, i;
loff_t addr0, addrn;
loff_t addr = ebnum * mtd->erasesize;
@@ -144,7 +144,6 @@ static int verify_eraseblock(int ebnum)
return err;
}
memset(twopages, 0, bufsize);
- read = 0;
err = mtd_read(mtd, addr, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
@@ -180,7 +179,6 @@ static int verify_eraseblock(int ebnum)
return err;
}
memset(twopages, 0, bufsize);
- read = 0;
err = mtd_read(mtd, addr, bufsize, &read, twopages);
if (mtd_is_bitflip(err))
err = 0;
@@ -203,7 +201,7 @@ static int verify_eraseblock(int ebnum)
static int crosstest(void)
{
- size_t read = 0;
+ size_t read;
int err = 0, i;
loff_t addr, addr0, addrn;
unsigned char *pp1, *pp2, *pp3, *pp4;
@@ -228,7 +226,6 @@ static int crosstest(void)
addrn -= mtd->erasesize;
/* Read 2nd-to-last page to pp1 */
- read = 0;
addr = addrn - pgsize - pgsize;
err = mtd_read(mtd, addr, pgsize, &read, pp1);
if (mtd_is_bitflip(err))
@@ -241,7 +238,6 @@ static int crosstest(void)
}
/* Read 3rd-to-last page to pp1 */
- read = 0;
addr = addrn - pgsize - pgsize - pgsize;
err = mtd_read(mtd, addr, pgsize, &read, pp1);
if (mtd_is_bitflip(err))
@@ -254,7 +250,6 @@ static int crosstest(void)
}
/* Read first page to pp2 */
- read = 0;
addr = addr0;
printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp2);
@@ -268,7 +263,6 @@ static int crosstest(void)
}
/* Read last page to pp3 */
- read = 0;
addr = addrn - pgsize;
printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp3);
@@ -282,7 +276,6 @@ static int crosstest(void)
}
/* Read first page again to pp4 */
- read = 0;
addr = addr0;
printk(PRINT_PREF "reading page at %#llx\n", (long long)addr);
err = mtd_read(mtd, addr, pgsize, &read, pp4);
@@ -309,7 +302,7 @@ static int crosstest(void)
static int erasecrosstest(void)
{
- size_t read = 0, written = 0;
+ size_t read, written;
int err = 0, i, ebnum, ebnum2;
loff_t addr0;
char *readbuf = twopages;
@@ -405,7 +398,7 @@ static int erasecrosstest(void)
static int erasetest(void)
{
- size_t read = 0, written = 0;
+ size_t read, written;
int err = 0, i, ebnum, ok = 1;
loff_t addr0;
diff --git a/drivers/mtd/tests/mtd_readtest.c b/drivers/mtd/tests/mtd_readtest.c
index ad5fd0d..4228eb4 100644
--- a/drivers/mtd/tests/mtd_readtest.c
+++ b/drivers/mtd/tests/mtd_readtest.c
@@ -44,7 +44,7 @@ static int pgcnt;
static int read_eraseblock_by_page(int ebnum)
{
- size_t read = 0;
+ size_t read;
int i, ret, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
diff --git a/drivers/mtd/tests/mtd_speedtest.c b/drivers/mtd/tests/mtd_speedtest.c
index ecb2878..4d2ed5c 100644
--- a/drivers/mtd/tests/mtd_speedtest.c
+++ b/drivers/mtd/tests/mtd_speedtest.c
@@ -139,7 +139,7 @@ static int erase_whole_device(void)
static int write_eraseblock(int ebnum)
{
- size_t written = 0;
+ size_t written;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
@@ -155,7 +155,7 @@ static int write_eraseblock(int ebnum)
static int write_eraseblock_by_page(int ebnum)
{
- size_t written = 0;
+ size_t written;
int i, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
@@ -178,7 +178,7 @@ static int write_eraseblock_by_page(int ebnum)
static int write_eraseblock_by_2pages(int ebnum)
{
- size_t written = 0, sz = pgsize * 2;
+ size_t written, sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
@@ -210,7 +210,7 @@ static int write_eraseblock_by_2pages(int ebnum)
static int read_eraseblock(int ebnum)
{
- size_t read = 0;
+ size_t read;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
@@ -229,7 +229,7 @@ static int read_eraseblock(int ebnum)
static int read_eraseblock_by_page(int ebnum)
{
- size_t read = 0;
+ size_t read;
int i, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
@@ -255,7 +255,7 @@ static int read_eraseblock_by_page(int ebnum)
static int read_eraseblock_by_2pages(int ebnum)
{
- size_t read = 0, sz = pgsize * 2;
+ size_t read, sz = pgsize * 2;
int i, n = pgcnt / 2, err = 0;
loff_t addr = ebnum * mtd->erasesize;
void *buf = iobuf;
diff --git a/drivers/mtd/tests/mtd_stresstest.c b/drivers/mtd/tests/mtd_stresstest.c
index 4789c0e..399aa2b 100644
--- a/drivers/mtd/tests/mtd_stresstest.c
+++ b/drivers/mtd/tests/mtd_stresstest.c
@@ -140,7 +140,7 @@ static int is_block_bad(int ebnum)
static int do_read(void)
{
- size_t read = 0;
+ size_t read;
int eb = rand_eb();
int offs = rand_offs();
int len = rand_len(offs), err;
@@ -169,7 +169,7 @@ static int do_read(void)
static int do_write(void)
{
int eb = rand_eb(), offs, err, len;
- size_t written = 0;
+ size_t written;
loff_t addr;
offs = offsets[eb];
diff --git a/drivers/mtd/tests/mtd_subpagetest.c b/drivers/mtd/tests/mtd_subpagetest.c
index 4b873d4..9667bf5 100644
--- a/drivers/mtd/tests/mtd_subpagetest.c
+++ b/drivers/mtd/tests/mtd_subpagetest.c
@@ -115,7 +115,7 @@ static int erase_whole_device(void)
static int write_eraseblock(int ebnum)
{
- size_t written = 0;
+ size_t written;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
@@ -150,7 +150,7 @@ static int write_eraseblock(int ebnum)
static int write_eraseblock2(int ebnum)
{
- size_t written = 0;
+ size_t written;
int err = 0, k;
loff_t addr = ebnum * mtd->erasesize;
@@ -189,13 +189,12 @@ static void print_subpage(unsigned char *p)
static int verify_eraseblock(int ebnum)
{
- size_t read = 0;
+ size_t read;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
set_random_data(writebuf, subpgsize);
clear_data(readbuf, subpgsize);
- read = 0;
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
if (unlikely(err || read != subpgsize)) {
if (mtd_is_bitflip(err) && read == subpgsize) {
@@ -223,7 +222,6 @@ static int verify_eraseblock(int ebnum)
set_random_data(writebuf, subpgsize);
clear_data(readbuf, subpgsize);
- read = 0;
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
if (unlikely(err || read != subpgsize)) {
if (mtd_is_bitflip(err) && read == subpgsize) {
@@ -252,7 +250,7 @@ static int verify_eraseblock(int ebnum)
static int verify_eraseblock2(int ebnum)
{
- size_t read = 0;
+ size_t read;
int err = 0, k;
loff_t addr = ebnum * mtd->erasesize;
@@ -261,7 +259,6 @@ static int verify_eraseblock2(int ebnum)
break;
set_random_data(writebuf, subpgsize * k);
clear_data(readbuf, subpgsize * k);
- read = 0;
err = mtd_read(mtd, addr, subpgsize * k, &read, readbuf);
if (unlikely(err || read != subpgsize * k)) {
if (mtd_is_bitflip(err) && read == subpgsize * k) {
@@ -288,14 +285,13 @@ static int verify_eraseblock2(int ebnum)
static int verify_eraseblock_ff(int ebnum)
{
uint32_t j;
- size_t read = 0;
+ size_t read;
int err = 0;
loff_t addr = ebnum * mtd->erasesize;
memset(writebuf, 0xff, subpgsize);
for (j = 0; j < mtd->erasesize / subpgsize; ++j) {
clear_data(readbuf, subpgsize);
- read = 0;
err = mtd_read(mtd, addr, subpgsize, &read, readbuf);
if (unlikely(err || read != subpgsize)) {
if (mtd_is_bitflip(err) && read == subpgsize) {
diff --git a/drivers/mtd/tests/mtd_torturetest.c b/drivers/mtd/tests/mtd_torturetest.c
index 30c4ed9..557105f 100644
--- a/drivers/mtd/tests/mtd_torturetest.c
+++ b/drivers/mtd/tests/mtd_torturetest.c
@@ -127,7 +127,7 @@ static inline int erase_eraseblock(int ebnum)
static inline int check_eraseblock(int ebnum, unsigned char *buf)
{
int err, retries = 0;
- size_t read = 0;
+ size_t read;
loff_t addr = ebnum * mtd->erasesize;
size_t len = mtd->erasesize;
@@ -181,7 +181,7 @@ retry:
static inline int write_pattern(int ebnum, void *buf)
{
int err;
- size_t written = 0;
+ size_t written;
loff_t addr = ebnum * mtd->erasesize;
size_t len = mtd->erasesize;
--
1.7.7.3
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