Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide

Pull IDE updates from David Miller:
 "Primarily IRQ disabling avoidance changes from Sebastian Andrzej
  Siewior"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide:
  ide: don't enable/disable interrupts in force threaded-IRQ mode
  ide: don't disable interrupts during kmap_atomic()
  ide: Handle irq disabling consistently
  alim15x3: move irq-restore before pci_dev_put()

5 files changed, 14 insertions, 16 deletions

diff --git a/drivers/ide/alim15x3.c b/drivers/ide/alim15x3.c
index 36f76e28a0bf..3265970aee34 100644
--- a/drivers/ide/alim15x3.c
+++ b/drivers/ide/alim15x3.c
@@ -323,9 +323,9 @@ out:
 
 		pci_write_config_byte(dev, 0x53, tmpbyte);
 	}
+	local_irq_restore(flags);
 	pci_dev_put(north);
 	pci_dev_put(isa_dev);
-	local_irq_restore(flags);
 	return 0;
 }
 
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c
index 6f25da56a169..a444bad7a2aa 100644
--- a/drivers/ide/ide-io.c
+++ b/drivers/ide/ide-io.c
@@ -659,8 +659,7 @@ void ide_timer_expiry (struct timer_list *t)
 		spin_unlock(&hwif->lock);
 		/* disable_irq_nosync ?? */
 		disable_irq(hwif->irq);
-		/* local CPU only, as if we were handling an interrupt */
-		local_irq_disable();
+
 		if (hwif->polling) {
 			startstop = handler(drive);
 		} else if (drive_is_ready(drive)) {
@@ -679,6 +678,7 @@ void ide_timer_expiry (struct timer_list *t)
 				startstop = ide_error(drive, "irq timeout",
 					hwif->tp_ops->read_status(hwif));
 		}
+		/* Disable interrupts again, `handler' might have enabled it */
 		spin_lock_irq(&hwif->lock);
 		enable_irq(hwif->irq);
 		if (startstop == ide_stopped && hwif->polling == 0) {
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 210a0887dd29..d55e9ebd5628 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -108,6 +108,7 @@ int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 	ide_hwif_t *hwif = drive->hwif;
 	const struct ide_tp_ops *tp_ops = hwif->tp_ops;
 	unsigned long flags;
+	bool irqs_threaded = force_irqthreads;
 	int i;
 	u8 stat;
 
@@ -115,8 +116,10 @@ int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 	stat = tp_ops->read_status(hwif);
 
 	if (stat & ATA_BUSY) {
-		local_save_flags(flags);
-		local_irq_enable_in_hardirq();
+		if (!irqs_threaded) {
+			local_save_flags(flags);
+			local_irq_enable_in_hardirq();
+		}
 		timeout += jiffies;
 		while ((stat = tp_ops->read_status(hwif)) & ATA_BUSY) {
 			if (time_after(jiffies, timeout)) {
@@ -129,12 +132,14 @@ int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 				if ((stat & ATA_BUSY) == 0)
 					break;
 
-				local_irq_restore(flags);
+				if (!irqs_threaded)
+					local_irq_restore(flags);
 				*rstat = stat;
 				return -EBUSY;
 			}
 		}
-		local_irq_restore(flags);
+		if (!irqs_threaded)
+			local_irq_restore(flags);
 	}
 	/*
 	 * Allow status to settle, then read it again.
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index c034cd965831..89b29028d315 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -237,7 +237,6 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 
 	while (len) {
 		unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
-		int page_is_high;
 
 		page = sg_page(cursg);
 		offset = cursg->offset + cmd->cursg_ofs;
@@ -248,10 +247,6 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 
 		nr_bytes = min_t(unsigned, nr_bytes, (PAGE_SIZE - offset));
 
-		page_is_high = PageHighMem(page);
-		if (page_is_high)
-			local_irq_save(flags);
-
 		buf = kmap_atomic(page) + offset;
 
 		cmd->nleft -= nr_bytes;
@@ -270,9 +265,6 @@ void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
 
 		kunmap_atomic(buf);
 
-		if (page_is_high)
-			local_irq_restore(flags);
-
 		len -= nr_bytes;
 	}
 }
@@ -413,7 +405,7 @@ static ide_startstop_t pre_task_out_intr(ide_drive_t *drive,
 		return startstop;
 	}
 
-	if ((drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
+	if (!force_irqthreads && (drive->dev_flags & IDE_DFLAG_UNMASK) == 0)
 		local_irq_disable();
 
 	ide_set_handler(drive, &task_pio_intr, WAIT_WORSTCASE);
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index e3336d904f64..4c2ef8084e32 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -24,6 +24,7 @@
 
 #ifdef CONFIG_IRQ_FORCED_THREADING
 __read_mostly bool force_irqthreads;
+EXPORT_SYMBOL_GPL(force_irqthreads);
 
 static int __init setup_forced_irqthreads(char *arg)
 {