• T
    libata: improve AC_ERR_DEV handling for ->post_internal_cmd · a51d644a
    Tejun Heo 提交于
    ->post_internal_cmd is simplified EH for internal commands.  Its
    primary mission is to stop the controller such that no rogue memory
    access or other activities occur after the internal command is
    released.  It may provide error diagnostics by setting qc->err_mask
    but this hasn't been a requirement.
    
    To ignore SETXFER failure for CFA devices, libata needs to know
    whether a command was failed by the device or for any other reason.
    ie. internal command needs to get AC_ERR_DEV right.
    
    This patch makes the following changes to AC_ERR_DEV handling and
    ->post_internal_cmd semantics to accomodate this need and simplify
    callback implementation.
    
    1. As long as the correct bits in the result TF registers are set,
       there is no need to set AC_ERR_DEV explicitly.  libata EH core
       takes care of that for both normal and internal commands.
    
    2. The only requirement for ->post_internal_cmd() is to put the
       controller into quiescent state.  It needs not to set any err_mask.
    
    3. ata_exec_internal_sg() performs minimal error analysis such that
       AC_ERR_DEV is automatically set as long as result_tf is filled
       correctly.
    Signed-off-by: NTejun Heo <htejun@gmail.com>
    Signed-off-by: NJeff Garzik <jeff@garzik.org>
    a51d644a
sata_inic162x.c 19.2 KB