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authorSebastian Andrzej Siewior <bigeasy@linutronix.de>2018-05-04 16:24:44 +0200
committerDavid S. Miller <davem@davemloft.net>2018-06-05 16:26:46 -0400
commit56f0ddadcea9dc264f1c8eed6cc984071b141554 (patch)
tree2da35ce3b963091950a542f30ce4c54a463aa1d5 /drivers/ide
parent820ec411e67c8dab645fb7e180875d619b6ab7e7 (diff)
downloadlinux-stericsson-56f0ddadcea9dc264f1c8eed6cc984071b141554.tar.gz
ide: Handle irq disabling consistently
ide_timer_expiry() disables interrupt at function entry when acquiring hwif->lock. Before disabling the device interrupt it unlocks hwif->lock, but interrupts stay disabled. After the call to disable_irq() interrupts are disabled again, which is a pointless exercise. After the device irq handler has been invoked with interrupts disabled, hwif->lock is acquired again with spin_lock_irq() because the device irq handler might have reenabled interrupts. This is not documented and confusing for the casual reader. Remove the redundant local_irq_disable() and add a comment which explains why hwif->lock has to be reacquired with spin_lock_irq(). Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: David S. Miller <davem@davemloft.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-io.c4
1 files changed, 2 insertions, 2 deletions
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) {