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Date: Sun, 13 Jul 2008 01:27:36 +0200
From: "Jakub W. Jozwicki" <jozwicki@...er.pl>
To: linux-kernel@...r.kernel.org
Subject: [PATCH 2.6.25.10 1/2] libata: fix locking for kmap_atomic
Change locking surrounding kmap_atomic from local_irqsave to
local_irqsave_nort. This fixes issues with PREEMPT_RT.
Signed-off-by: Jakub Jozwicki <jozwicki@...er.pl>
--- linux-2.6.25.10/drivers/ata/libata-core.c 2008-07-03 05:46:47.000000000
+0200
+++ linux-2.6.25.10-rt7/drivers/ata/libata-core.c 2008-07-12
23:59:33.132140258 +0200
@@ -5157,14 +5157,14 @@
unsigned long flags;
/* FIXME: use a bounce buffer */
- local_irq_save(flags);
+ local_irq_save_nort(flags);
buf = kmap_atomic(page, KM_IRQ0);
/* do the actual data transfer */
ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
kunmap_atomic(buf, KM_IRQ0);
- local_irq_restore(flags);
+ local_irq_restore_nort(flags);
} else {
buf = page_address(page);
ap->ops->data_xfer(qc->dev, buf + offset, qc->sect_size, do_write);
@@ -5294,14 +5294,14 @@
unsigned long flags;
/* FIXME: use bounce buffer */
- local_irq_save(flags);
+ local_irq_save_nort(flags);
buf = kmap_atomic(page, KM_IRQ0);
/* do the actual data transfer */
consumed = ap->ops->data_xfer(dev, buf + offset, count, rw);
kunmap_atomic(buf, KM_IRQ0);
- local_irq_restore(flags);
+ local_irq_restore_nort(flags);
} else {
buf = page_address(page);
consumed = ap->ops->data_xfer(dev, buf + offset, count, rw);
--
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