[U-Boot] PATCH mtd CFI flash: timeout calculation underflow if imprecise 1kHz timer: fix

Renato Andreola
2009-04-10T12:28:59Z

From 6cc63851e5e4c16012d9afad70cedb41b7340de7 Mon Sep 17 00:00:00 2001
From: Renato Andreola <renato.andreola@imagos.it>
Date: Fri, 10 Apr 2009 12:52:55 +0200
Subject: drivers/mtd/cfi_flash: precision and underflow problem in tout
calculation

With old configuration it could happen tout=0 if CONFIG_SYS_HZ<1000
solved using an unsigned long long
---
drivers/mtd/cfi_flash.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
index 175d82a..0aa42a2 100644
--- a/drivers/mtd/cfi_flash.c
+++ b/drivers/mtd/cfi_flash.c
@@ -660,7 +660,9 @@ static int flash_status_check (flash_info_t * info,
flash_sect_t sector,
ulong start;

#if CONFIG_SYS_HZ != 1000
- tout *= CONFIG_SYS_HZ/1000;
+ unsigned long long ull;
+ ull = tout*CONFIG_SYS_HZ + CONFIG_SYS_HZ/2;
+ tout = ull/1000; /* Compute: tout *= CONFIG_SYS_HZ/1000; */
#endif

/* Wait for command completion */
--
1.5.5