rtc: rtc-isl1208: reject invalid dates
This patch for the rtc-isl1208 driver makes it reject invalid dates. Signed-off-by: Chris Elston <celston@katalix.com> [a.zummo@towertech.it: added comment explaining the check] Signed-off-by: Alessandro Zummo <a.zummo@towertech.it> Cc: Hebert Valerio Riedel <hvr@gnu.org> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -328,6 +328,13 @@ isl1208_i2c_set_time(struct i2c_client *client, struct rtc_time const *tm)
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int sr;
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u8 regs[ISL1208_RTC_SECTION_LEN] = { 0, };
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/* The clock has an 8 bit wide bcd-coded register (they never learn)
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* for the year. tm_year is an offset from 1900 and we are interested
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* in the 2000-2099 range, so any value less than 100 is invalid.
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*/
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if (tm->tm_year < 100)
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return -EINVAL;
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regs[ISL1208_REG_SC] = bin2bcd(tm->tm_sec);
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regs[ISL1208_REG_MN] = bin2bcd(tm->tm_min);
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regs[ISL1208_REG_HR] = bin2bcd(tm->tm_hour) | ISL1208_REG_HR_MIL;
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