[PATCH/RFC 7/9] libata: pdc_freeze() semantic change

[Albert Lee <albertcc@tw.ibm.com>]

Patch 7/9:

 After checking the current implementations of freeze()/thaw(), it seems only pdc_freeze()
do more than simple irq masking. Remove the DMA disable code from pdc_freeze().

The question is the design/semantic of freeze()/thaw().
Maybe we should limit them to simple irq on/off?

Signed-off-by: Albert Lee <albertcc@tw.ibm.com>
---

diff -Nrup 06_add_freeze_thaw_to_lldd/drivers/ata/sata_promise.c 07_sata_promise_freeze/drivers/ata/sata_promise.c
--- 06_add_freeze_thaw_to_lldd/drivers/ata/sata_promise.c	2007-06-11 17:23:47.000000000 +0800
+++ 07_sata_promise_freeze/drivers/ata/sata_promise.c	2007-06-13 13:39:33.000000000 +0800
@@ -581,7 +581,6 @@ static void pdc_freeze(struct ata_port *
 
 	tmp = readl(mmio + PDC_CTLSTAT);
 	tmp |= PDC_IRQ_DISABLE;
-	tmp &= ~PDC_DMA_ENABLE;
 	writel(tmp, mmio + PDC_CTLSTAT);
 	readl(mmio + PDC_CTLSTAT); /* flush */
 }