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cfi_flash: precision and underflow problem in tout calculation

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With old configuration it could happen tout=0 if CONFIG_SYS_HZ<1000.

Signed-off-by: Renato Andreola <renato.andreola@imagos.it>
Signed-off-by: Alessandro Rubini <rubini@gnudd.com>
Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: Stefan Roese <sr@denx.de>
This commit is contained in:
Renato Andreola 2010-03-24 23:00:47 +08:00 committed by Stefan Roese
parent 7027d5622d
commit c40c94a3d2
1 changed files with 4 additions and 1 deletions
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5
drivers/mtd/cfi_flash.c
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@ -537,7 +537,10 @@ 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;
if ((ulong)CONFIG_SYS_HZ > 100000)
tout *= (ulong)CONFIG_SYS_HZ / 1000; /* for a big HZ, avoid overflow */
else
tout = DIV_ROUND_UP(tout * (ulong)CONFIG_SYS_HZ, 1000);
#endif
/* Wait for command completion */