[PATCH] add hwif->hold flag

Add hwif->hold flag for hotswap interfaces.
Initialize founded hwif in ide_register_hw().

Original patch by Benjamin Herrenschmidt.

drivers/ide/ide.c

@@ -913,6 +913,8 @@ int ide_register_hw (hw_regs_t *hw, ide_hwif_t **hwifp)
 		}
 		for (index = 0; index < MAX_HWIFS; ++index) {
 			hwif = &ide_hwifs[index];
+			if (hwif->hold)
+				continue;
 			if ((!hwif->present && !hwif->mate && !initializing) ||
 			    (!hwif->hw.io_ports[IDE_DATA_OFFSET] && initializing))
 				goto found;
@@ -924,6 +926,8 @@ int ide_register_hw (hw_regs_t *hw, ide_hwif_t **hwifp)
 found:
 	if (hwif->present)
 		ide_unregister(index);
+	else if (!hwif->hold)
+		init_hwif_data(index);
 	if (hwif->present)
 		return -1;
 	memcpy(&hwif->hw, hw, sizeof(*hw));

include/linux/ide.h

@@ -1001,6 +1001,7 @@ typedef struct hwif_s {
 
 	unsigned	noprobe    : 1;	/* don't probe for this interface */
 	unsigned	present    : 1;	/* this interface exists */
+	unsigned	hold       : 1; /* this interface is always present */
 	unsigned	serialized : 1;	/* serialized all channel operation */
 	unsigned	sharing_irq: 1;	/* 1 = sharing irq with another hwif */
 	unsigned	reset      : 1;	/* reset after probe */