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Subject[PATCH 2/6] ide: add ->cur_port to struct ide_host and use it for serialized hosts
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Subject: [PATCH] ide: add ->cur_port to struct ide_host and use it for serialized hosts

* Pass 'ide_hwif_t *' instead of 'ide_hwgroup_t *' to unexpected_intr().

* Cache pointer to the port currently being serviced in ->cur_port
and use it instead of hwif->hwgroup on serialized hosts.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
---
drivers/ide/ide-io.c | 25 +++++++++++++++----------
include/linux/ide.h | 1 +
2 files changed, 16 insertions(+), 10 deletions(-)
Index: b/drivers/ide/ide-io.c
===================================================================
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -726,7 +726,7 @@ void do_ide_request(struct request_queue
if (!ide_lock_hwgroup(hwgroup)) {
ide_hwif_t *prev_port;
repeat:
- prev_port = hwgroup->hwif;
+ prev_port = hwif->host->cur_port;
hwgroup->rq = NULL;

if (drive->dev_flags & IDE_DFLAG_SLEEPING) {
@@ -736,15 +736,17 @@ repeat:
}
}

- if (hwif != prev_port) {
+ if ((hwif->host->host_flags & IDE_HFLAG_SERIALIZE) &&
+ hwif != prev_port) {
/*
* set nIEN for previous port, drives in the
* quirk_list may not like intr setups/cleanups
*/
- if (hwgroup->drive->quirk_list == 0)
+ if (prev_port && hwgroup->drive->quirk_list == 0)
prev_port->tp_ops->set_irq(prev_port, 0);
+
+ hwif->host->cur_port = hwif;
}
- hwgroup->hwif = hwif;
hwgroup->drive = drive;
drive->dev_flags &= ~(IDE_DFLAG_SLEEPING | IDE_DFLAG_PARKED);

@@ -976,7 +978,7 @@ void ide_timer_expiry (unsigned long dat
/**
* unexpected_intr - handle an unexpected IDE interrupt
* @irq: interrupt line
- * @hwgroup: hwgroup being processed
+ * @hwif: port being processed
*
* There's nothing really useful we can do with an unexpected interrupt,
* other than reading the status register (to clear it), and logging it.
@@ -1005,11 +1007,11 @@ void ide_timer_expiry (unsigned long dat
* is doing the current command, but we don't know which hwif burped
* mysteriously.
*/
-
-static void unexpected_intr (int irq, ide_hwgroup_t *hwgroup)
+
+static void unexpected_intr(int irq, ide_hwif_t *hwif)
{
+ ide_hwgroup_t *hwgroup = hwif->hwgroup;
u8 stat;
- ide_hwif_t *hwif = hwgroup->hwif;

/*
* handle the unexpected interrupt
@@ -1044,7 +1046,7 @@ static void unexpected_intr (int irq, id
* not need to override it. If you do be aware it is subtle in
* places
*
- * hwgroup->hwif is the interface in the group currently performing
+ * hwif is the interface in the group currently performing
* a command. hwgroup->drive is the drive and hwgroup->handler is
* the IRQ handler to call. As we issue a command the handlers
* step through multiple states, reassigning the handler to the
@@ -1070,6 +1072,9 @@ irqreturn_t ide_intr (int irq, void *dev
irqreturn_t irq_ret = IRQ_NONE;
int plug_device = 0;

+ if (hwif->host->host_flags & IDE_HFLAG_SERIALIZE)
+ hwif = hwif->host->cur_port;
+
spin_lock_irqsave(&hwgroup->lock, flags);

if (!ide_ack_intr(hwif))
@@ -1099,7 +1104,7 @@ irqreturn_t ide_intr (int irq, void *dev
* Probably not a shared PCI interrupt,
* so we can safely try to do something about it:
*/
- unexpected_intr(irq, hwgroup);
+ unexpected_intr(irq, hwif);
#ifdef CONFIG_BLK_DEV_IDEPCI
} else {
/*
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -852,6 +852,7 @@ struct ide_host {
unsigned int (*init_chipset)(struct pci_dev *);
unsigned long host_flags;
void *host_priv;
+ ide_hwif_t *cur_port; /* for hosts requiring serialization */
};

/*

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