• David Brownell's avatar
    rtc: remove "RTC_ALM_SET mode" bugs · f8245c26
    David Brownell authored
    This fixes a common glitch in how RTC drivers handle two "set alarm" modes,
    by getting rid of the surprising/hidden one that was rarely implemented
    correctly (and which could expose nonportable hardware-specific behavior).
    
    The glitch comes from the /dev/rtcX logic implementing the legacy
    RTC_ALM_SET (limited to 24 hours, needing RTC_AIE_ON) ioctl on top of the
    RTC driver call providing access to the newer RTC_WKALM_SET (without those
    limitations) by initializing the day/month/year fields to be invalid ...
    that second mode.
    
    Now, since few RTC drivers check those fields, and most hardware misbehaves
    when faced with invalid date fields, many RTC drivers will set bogus alarm
    times on those RTC_ALM_SET code paths.  (Several in-tree drivers have that
    issue, and I also noticed it with code reviews on several new RTC drivers.)
    
    This patch ensures that RTC drivers never see such invalid alarm fields, by
    moving some logic out of rtc-omap into the RTC_ALM_SET code and adding an
    explicit check (which will prevent the issue on other code paths).
    Signed-off-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
    Cc: Scott Wood <scottwood@freescale.com>
    Cc: Alessandro Zummo <a.zummo@towertech.it>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    f8245c26
rtc.txt 15.1 KB