2.6.29 acpi regression: acpi_ex_extract_from_field -- div by zero

[Jiri Slaby]

Hi,

sometimes, when booting up/resuming from disk, I get an oops[1].

obj_desc->common_field.access_bit_width is zero, but even after the 
loop. Division before the loop is apparently OK.

This is the case:
        /* Mask off any extra bits in the last datum */

        buffer_tail_bits = obj_desc->common_field.bit_length %
            obj_desc->common_field.access_bit_width;

.L39:
        xorl    %edx, %edx      #
        movzbl  37(%rbx), %esi  # 
<variable>.common_field.access_bit_width, 
<variable>.common_field.access_bit_width
        movl    24(%rbx), %eax  # <variable>.common_field.bit_length, 
<variable>.common_field.bit_length
--------------- here:
        divl    %esi    # <variable>.common_field.access_bit_width
        movl    %edx, %ecx      #, tmp121
        testl   %edx, %edx      # tmp121
        je      .L41    #,

[1] http://www.fi.muni.cz/~xslaby/sklad/panics/acpi_oops.png
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