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

Stefan Roese
2009-08-25T15:39:56Z

On Monday 24 August 2009 10:32:17 Renato Andreola wrote:
> From 21d84ab72266f118794233176bd356d8b1cfdf35 Mon Sep 17 00:00:00 2001
> From: Renato Andreola <renato.andreola@imagos.it>
> Date: Fri, 21 Aug 2009 18:05:51 +0200
> Subject: [PATCH] drivers/mtd/cfi_flash: precision and underflow problem in
> tout calculation
>
> With old configuration it could happen tout=0 if CONFIG_SYS_HZ<1000.
>
> Signed-off-by: Alessandro Rubini <rubini@gnudd.com> Renato Andreola
> <renato.andreola@imagos.it>

A few mostly formal comments about this patch:

- Patch doesn't apply:

[stefan at stefan-desktop u-boot-cfi-flash (master)]$ git am -s patches_misc/\[U-
Boot\]\ PATCH\ mtd\ CFI\ flash\:\ timeout\ calculation\ underflow\ if\
imprecise\ 1kHz\ timer\:\ fix.mbox
Applying: PATCH mtd CFI flash: timeout calculation underflow if imprecise 1kHz
timer: fix
/home/stefan/git/u-boot/u-boot-cfi-flash/.git/rebase-apply/patch:20: trailing
whitespace.
#endif
error: patch failed: drivers/mtd/cfi_flash.c:660
error: drivers/mtd/cfi_flash.c: patch does not apply

Please fix by using "git format-patch" and "git send-email".

- Patch subject is mangled:

Applying your patch (if possible) would lead to this commit text/subject:
"PATCH mtd CFI flash: timeout calculation underflow if imprecise 1kHz timer:
fix". This is because your email subject is incorrect (e.g. PATCH should be
[PATCH]). And the subject it too long as well. Please use a shorter line here.

- Minor coding style problem (see below)

> ---
> drivers/mtd/cfi_flash.c | 8 +++++---
> 1 files changed, 5 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mtd/cfi_flash.c b/drivers/mtd/cfi_flash.c
> index 81ac5d3..0d8fc54 100644
> --- a/drivers/mtd/cfi_flash.c
> +++ b/drivers/mtd/cfi_flash.c
> @@ -660,9 +660,11 @@ 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;
> -#endif
> -
> + if ((ulong)CONFIG_SYS_HZ > 100000)
> + tout *= (ulong)CONFIG_SYS_HZ/1000; /* for a big HZ, avoid
overflow */

Please insert spaces before and after the "/" above.

> + else
> + tout = DIV_ROUND_UP(tout*(ulong)CONFIG_SYS_HZ, 1000);
> +#endif
> /* Wait for command completion */
> start = get_timer (0);
> while (flash_is_busy (info, sector)) {

Thanks.

Cheers,
Stefan

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