libata/pdc_adma: make SFF EH handle non-bmdma SFF drivers and standardize pdc_adma ops

pdc_adma has interface similar to SFF but has its own DMA interface.
It currently implements noop bmdma ops to avoid crashing
ata_bmdma_error_handler() which BTW actually is EH for SFF drivers.

This patch makes ata_bmdma_error_handler() dereference bmdma ops iff
bmdma_addr is initialized as done in ata_bmdma_post_internal_cmd.
This change allows pdc_adma to standardize ops and use SFF
error_handler and post_internal_cmd.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Cc: Mark Lord <liml@rtr.ca>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

drivers/ata/libata-sff.c

@@ -2014,7 +2014,8 @@ void ata_bmdma_error_handler(struct ata_port *ap)
 
 	ap->hsm_task_state = HSM_ST_IDLE;
 
-	if (qc && (qc->tf.protocol == ATA_PROT_DMA ||
+	if (ap->ioaddr.bmdma_addr &&
+	    qc && (qc->tf.protocol == ATA_PROT_DMA ||
 		   qc->tf.protocol == ATAPI_PROT_DMA)) {
 		u8 host_stat;
 

drivers/ata/pdc_adma.c

@@ -136,8 +136,6 @@ static void adma_port_stop(struct ata_port *ap);
 static void adma_qc_prep(struct ata_queued_cmd *qc);
 static unsigned int adma_qc_issue(struct ata_queued_cmd *qc);
 static int adma_check_atapi_dma(struct ata_queued_cmd *qc);
-static void adma_bmdma_stop(struct ata_queued_cmd *qc);
-static u8 adma_bmdma_status(struct ata_port *ap);
 static void adma_freeze(struct ata_port *ap);
 static void adma_thaw(struct ata_port *ap);
 static int adma_prereset(struct ata_link *link, unsigned long deadline);
@@ -158,8 +156,6 @@ static struct ata_port_operations adma_ata_ops = {
 	.exec_command		= ata_exec_command,
 	.data_xfer		= ata_data_xfer,
 	.check_atapi_dma	= adma_check_atapi_dma,
-	.bmdma_stop		= adma_bmdma_stop,
-	.bmdma_status		= adma_bmdma_status,
 	.qc_prep		= adma_qc_prep,
 	.qc_issue		= adma_qc_issue,
 	.irq_on			= ata_irq_on,
@@ -168,6 +164,8 @@ static struct ata_port_operations adma_ata_ops = {
 	.thaw			= adma_thaw,
 	.prereset		= adma_prereset,
 	.softreset		= ata_std_softreset,
+	.error_handler		= ata_bmdma_error_handler,
+	.post_internal_cmd	= ata_bmdma_post_internal_cmd,
 
 	.port_start		= adma_port_start,
 	.port_stop		= adma_port_stop,
@@ -204,16 +202,6 @@ static int adma_check_atapi_dma(struct ata_queued_cmd *qc)
 	return 1;	/* ATAPI DMA not yet supported */
 }
 
-static void adma_bmdma_stop(struct ata_queued_cmd *qc)
-{
-	/* nothing */
-}
-
-static u8 adma_bmdma_status(struct ata_port *ap)
-{
-	return 0;
-}
-
 static void adma_reset_engine(struct ata_port *ap)
 {
 	void __iomem *chan = ADMA_PORT_REGS(ap);