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SubjectRe: [PATCH] rtc/r9701: avoid second call to the rtc_valid_tm
On Thu, 21 Jun 2012 12:34:40 +0530
Devendra Naga <devendra.aaru@gmail.com> wrote:

> r9701_get_datetime will call the rtc_valid_tm and it returns the
> value returned by rtc_valid_tm, which anyway can be used in the if
>
> so calling rtc_valid_tm is not required.
>
> Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
> ---
>
>
> This change is compiled tested only using gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3 on x86_64 (intel core i3).
>
> drivers/rtc/rtc-r9701.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/rtc/rtc-r9701.c b/drivers/rtc/rtc-r9701.c
> index 33b6ba0..e6c34c0 100644
> --- a/drivers/rtc/rtc-r9701.c
> +++ b/drivers/rtc/rtc-r9701.c
> @@ -138,8 +138,7 @@ static int __devinit r9701_probe(struct spi_device *spi)
> * contain invalid values. If so, try to write a default date:
> * 2000/1/1 00:00:00
> */
> - r9701_get_datetime(&spi->dev, &dt);
> - if (rtc_valid_tm(&dt)) {
> + if (r9701_get_datetime(&spi->dev, &dt)) {
> dev_info(&spi->dev, "trying to repair invalid date/time\n");
> dt.tm_sec = 0;
> dt.tm_min = 0;

Looks OK.


I think the driver would be better if we were to do this:


From: Andrew Morton <akpm@linux-foundation.org>
Subject: drivers/rtc/rtc-r9701.c: check that r9701_set_datetime() succeeded

When the driver detects that the clock time is invalid, it attempts to
write a sane time into the hardware. We curently assume that everything
is OK is those writes succeeded. But it is better to re-read the time
from the hardware to ensure that the new settings got there OK.

Cc: Devendra Naga <devendra.aaru@gmail.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Anatolij Gustschin <agust@denx.de>
Cc: Andreas Dumberger <andreas.dumberger@tqs.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

drivers/rtc/rtc-r9701.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN drivers/rtc/rtc-r9701.c~a drivers/rtc/rtc-r9701.c
--- a/drivers/rtc/rtc-r9701.c~a
+++ a/drivers/rtc/rtc-r9701.c
@@ -147,7 +147,8 @@ static int __devinit r9701_probe(struct
dt.tm_mon = 0;
dt.tm_year = 100;

- if (r9701_set_datetime(&spi->dev, &dt)) {
+ if (r9701_set_datetime(&spi->dev, &dt) ||
+ r9701_get_datetime(&spi->dev, &dt)) {
dev_err(&spi->dev, "cannot repair RTC register\n");
return -ENODEV;
}
_

But I can't test this :(


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