[PATCH 4/4] ide: don't enable/disable interrupts in force threaded-IRQ mode

[Sebastian Andrzej Siewior]

The interrupts are enabled/disabled so the interrupt handler can run
with enabled interrupts while serving the interrupt and not lose other
interrupts especially the timer tick.
If the system runs with force-threaded interrupts then there is no need
to enable the interrupts.

Signed-off-by: Sebastian Andrzej Siewior <bige...@linutronix.de>
---
 drivers/ide/ide-iops.c     | 13 +++++++++----
 drivers/ide/ide-taskfile.c |  2 +-
 kernel/irq/manage.c        |  1 +
 3 files changed, 11 insertions(+), 5 deletions(-)

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 49f9b4739779..d42feeaebd36 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -405,7 +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)
 {
-- 
2.17.0