Dear Andrew,
On 08/23/2014 05:42 AM, Andrew Morton wrote:
> On Tue, 12 Aug 2014 11:01:07 +0900 y@xxxxxxxxxxx wrote:
>
>> This patch define s3c_rtc structure including necessary variables for S3C RTC
>> device instead of global variables. This patch improves the readability by
>> removing global variables.
>
> Below is the v1->v2 delta.
>
> Why were all those tests of info->base added? Can it really be zero?
> I don't see how.
If some functions (e.g., s3c_rtc_settime) accesses the rtc register
by using info->base before the initialization of info->base in s3c_rtc_probe,
I thought that null pointer error would happen.
But, I missed one point which info->base might have the garbate data instead of NULL.
I'll add the initialization code for info->base.
info->base = NULL;
If you don't agree it, I'll drop this code checking the state of info->base on next patchset(v3).
Best Regads,
Chanwoo Choi
>
> --- a/drivers/rtc/rtc-s3c.c~rtc-s3c-define-s3c_rtc-structure-to-remove-global-variables-v2
> +++ a/drivers/rtc/rtc-s3c.c
> @@ -121,6 +121,9 @@ static int s3c_rtc_setaie(struct device
> struct s3c_rtc *info = dev_get_drvdata(dev);
> unsigned int tmp;
>
> + if (!info->base)
> + return -EINVAL;
> +
> dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
>
> clk_enable(info->rtc_clk);
> @@ -180,6 +183,9 @@ static int s3c_rtc_gettime(struct device
> struct s3c_rtc *info = dev_get_drvdata(dev);
> unsigned int have_retried = 0;
>
> + if (!info->base)
> + return -EINVAL;
> +
> clk_enable(info->rtc_clk);
> retry_get_time:
> rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
> @@ -224,6 +230,9 @@ static int s3c_rtc_settime(struct device
> struct s3c_rtc *info = dev_get_drvdata(dev);
> int year = tm->tm_year - 100;
>
> + if (!info->base)
> + return -EINVAL;
> +
> dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
> 1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
> tm->tm_hour, tm->tm_min, tm->tm_sec);
> @@ -255,6 +264,9 @@ static int s3c_rtc_getalarm(struct devic
> struct rtc_time *alm_tm = &alrm->time;
> unsigned int alm_en;
>
> + if (!info->base)
> + return -EINVAL;
> +
> clk_enable(info->rtc_clk);
> alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
> alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
> @@ -317,6 +329,9 @@ static int s3c_rtc_setalarm(struct devic
> struct rtc_time *tm = &alrm->time;
> unsigned int alrm_en;
>
> + if (!info->base)
> + return -EINVAL;
> +
> clk_enable(info->rtc_clk);
> dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
> alrm->enabled,
> @@ -357,6 +372,9 @@ static int s3c_rtc_proc(struct device *d
> struct s3c_rtc *info = dev_get_drvdata(dev);
> unsigned int ticnt;
>
> + if (!info->base)
> + return -EINVAL;
> +
> clk_enable(info->rtc_clk);
> if (info->cpu_type == TYPE_S3C64XX) {
> ticnt = readw(info->base + S3C2410_RTCCON);
> @@ -548,7 +566,7 @@ static int s3c_rtc_probe(struct platform
> rtc_tm.tm_min = 0;
> rtc_tm.tm_sec = 0;
>
> - s3c_rtc_settime(NULL, &rtc_tm);
> + s3c_rtc_settime(&pdev->dev, &rtc_tm);
>
> dev_warn(&pdev->dev, "warning: invalid RTC value so initializing it\n");
> }
> _
>
>
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