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    • Scott Valentine's avatar
      rtc: v3020: fix v3020_mmio_read_bit() · bcb3a167
      Scott Valentine authored
      
      v3020_mmio_read_bit() always returns 0 when left_shift > 7.
      
      v3020_mmio_read_bit()'s return type is (unsigned char).  The code returns
      a value masked by (1 << left_shift) that is casted to the return type.  If
      left_shift is larger than 7, the cast will always result in a 0 return
      value.  The problem was discovered with left_shift = 16, and the included
      patch corrects the problem.
      
      The bug was introduced in the last (Apr 3 2009) commit of the file, kernel
      versions 2.6.30 and later.
      
      Cc: Alessandro Zummo <a.zummo@towertech.it>
      Cc: Paul Gortmaker <p_gortmaker@yahoo.com>
      Cc: Raphael Assenat <raph@8d.com>
      Cc: <stable@kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      bcb3a167
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