• Ben Zhang's avatar
    pstore/ram: Strip ramoops header for correct decompression · a28726b4
    Ben Zhang authored
    
    
    pstore compression/decompression was added during 3.12.
    The ramoops driver prepends a "====timestamp.timestamp-C|D\n"
    header to the compressed record before handing it over to pstore
    driver which doesn't know about the header. In pstore_decompress(),
    the pstore driver reads the first "==" as a zlib header, so the
    decompression always fails. For example, this causes the driver
    to write /dev/pstore/dmesg-ramoops-0.enc.z instead of
    /dev/pstore/dmesg-ramoops-0.
    
    This patch makes the ramoops driver remove the header before
    pstore decompression.
    Signed-off-by: default avatarBen Zhang <benzh@chromium.org>
    Acked-by: default avatarKees Cook <keescook@chromium.org>
    Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
    a28726b4