ata: libata: remove deprecated EH callbacks

Exception and probe handling (EH)

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

::

    void (*eng_timeout) (struct ata_port *ap);

    void (*phy_reset) (struct ata_port *ap);

Deprecated. Use ``->error_handler()`` instead.

::

    void (*freeze) (struct ata_port *ap);

                       u32 val);

Read and write standard SATA phy registers. Currently only used if

``->phy_reset`` hook called the :c:func:`sata_phy_reset` helper function.

Read and write standard SATA phy registers.

sc_reg is one of SCR_STATUS, SCR_CONTROL, SCR_ERROR, or SCR_ACTIVE.

Init and shutdown

:c:func:`ata_scsi_error` is the current ``transportt->eh_strategy_handler()``

for libata. As discussed above, this will be entered in two cases -

timeout and ATAPI error completion. This function calls low level libata

driver's :c:func:`eng_timeout` callback, the standard callback for which is

:c:func:`ata_eng_timeout`. It checks if a qc is active and calls

:c:func:`ata_qc_timeout` on the qc if so. Actual error handling occurs in

:c:func:`ata_qc_timeout`.

timeout and ATAPI error completion. This function will check if a qc is active

and has not failed yet. Such a qc will be marked with AC_ERR_TIMEOUT such that

EH will know to handle it later. Then it calls low level libata driver's

:c:func:`error_handler` callback.

If EH is invoked for timeout, :c:func:`ata_qc_timeout` stops BMDMA and

When the :c:func:`error_handler` callback is invoked it stops BMDMA and

completes the qc. Note that as we're currently in EH, we cannot call

scsi_done. As described in SCSI EH doc, a recovered scmd should be

either retried with :c:func:`scsi_queue_insert` or finished with

 *	document.

 *

 *	This function is also called to turn off DMA when a timeout occurs

 *	during DMA operation. In both cases we need to reset the engine,

 *	so no actual eng_timeout handler is required.

 *	during DMA operation. In both cases we need to reset the engine.

 *

 *	We assume bmdma_stop is always called if bmdma_start as called. If

 *	not then we may need to wrap qc_issue.

	ssize_t (*transmit_led_message)(struct ata_port *ap, u32 state,

					ssize_t size);

	/*

	 * Obsolete

	 */

	void (*phy_reset)(struct ata_port *ap);

	void (*eng_timeout)(struct ata_port *ap);

	/*

	 * ->inherits must be the last field and all the preceding

	 * fields must be pointers.