[PATCH] mtd: pxa3xx_nand: cleanup wait_for_completion handling

From: Nicholas Mc Guire
Date: Sun Feb 01 2015 - 12:01:03 EST


return type of wait_for_completion_timeout is unsigned long not int, this
patch uses the return value of wait_for_completion_timeout in the condition
directly rather than assigning it to an incorrect type variable.

The timeout declaration cleanup is just for readability

Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
---

The variable used for handling the return of wait_for_cmpletion_timeout
was int but should be unsigned long, where it was not in use for anything
else and the return value in case of completion (>0) is not used it was
removed and wait_for_completion_timeout() used directly in the if condition.

To make the timeout values a bit simpler to read and also handle all of
the corner cases correctly the declarations are moved to msecs_to_jiffies().

This patch was only compile tested for pxa3xx_defconfig
(implies CONFIG_MTD_NAND_PXA3xx=y)

Patch is against 3.0.19-rc6 -next-20150130

drivers/mtd/nand/pxa3xx_nand.c | 24 ++++++++++--------------
1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 96b0b1d..ef6545b 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -38,8 +38,8 @@

#include <linux/platform_data/mtd-nand-pxa3xx.h>

-#define CHIP_DELAY_TIMEOUT (2 * HZ/10)
-#define NAND_STOP_DELAY (2 * HZ/50)
+#define CHIP_DELAY_TIMEOUT msecs_to_jiffies(200)
+#define NAND_STOP_DELAY msecs_to_jiffies(40)
#define PAGE_CHUNK_SIZE (2048)

/*
@@ -915,7 +915,7 @@ static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
- int ret, exec_cmd;
+ int exec_cmd;

/*
* if this is a x16 device ,then convert the input
@@ -947,9 +947,8 @@ static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
info->need_wait = 1;
pxa3xx_nand_start(info);

- ret = wait_for_completion_timeout(&info->cmd_complete,
- CHIP_DELAY_TIMEOUT);
- if (!ret) {
+ if (!wait_for_completion_timeout(&info->cmd_complete,
+ CHIP_DELAY_TIMEOUT)) {
dev_err(&info->pdev->dev, "Wait time out!!!\n");
/* Stop State Machine for next command cycle */
pxa3xx_nand_stop(info);
@@ -964,7 +963,7 @@ static void nand_cmdfunc_extended(struct mtd_info *mtd,
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
- int ret, exec_cmd, ext_cmd_type;
+ int exec_cmd, ext_cmd_type;

/*
* if this is a x16 device then convert the input
@@ -1027,9 +1026,8 @@ static void nand_cmdfunc_extended(struct mtd_info *mtd,
init_completion(&info->cmd_complete);
pxa3xx_nand_start(info);

- ret = wait_for_completion_timeout(&info->cmd_complete,
- CHIP_DELAY_TIMEOUT);
- if (!ret) {
+ if (!wait_for_completion_timeout(&info->cmd_complete,
+ CHIP_DELAY_TIMEOUT)) {
dev_err(&info->pdev->dev, "Wait time out!!!\n");
/* Stop State Machine for next command cycle */
pxa3xx_nand_stop(info);
@@ -1162,13 +1160,11 @@ static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
{
struct pxa3xx_nand_host *host = mtd->priv;
struct pxa3xx_nand_info *info = host->info_data;
- int ret;

if (info->need_wait) {
- ret = wait_for_completion_timeout(&info->dev_ready,
- CHIP_DELAY_TIMEOUT);
info->need_wait = 0;
- if (!ret) {
+ if (!wait_for_completion_timeout(&info->dev_ready,
+ CHIP_DELAY_TIMEOUT)) {
dev_err(&info->pdev->dev, "Ready time out!!!\n");
return NAND_STATUS_FAIL;
}
--
1.7.10.4

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