[PATCH 2/5] ide: add cpu cache flushes after kmapping and modifying a page

[Tejun Heo <htejun@gmail.com>]

Add calls to flush_kernel_dcache_page() after CPU has kmapped and
modified a page.  This fixes PIO cache coherency bugs on architectures
with aliased caches.

Signed-off-by: Tejun Heo <htejun@gmail.com>

---

 drivers/ide/ide-floppy.c   |    1 +
 drivers/ide/ide-taskfile.c |    2 ++
 2 files changed, 3 insertions(+), 0 deletions(-)

861367f65bbbbc5c9f5d3a27aab91c587a3a9049
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index a53e3ce..5be22c2 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -618,6 +618,7 @@ static void idefloppy_input_buffers (ide
 
 			data = bvec_kmap_irq(bvec, &flags);
 			drive->hwif->atapi_input_bytes(drive, data, count);
+			flush_kernel_dcache_page(kmap_atomic_to_page(data));
 			bvec_kunmap_irq(data, &flags);
 
 			bcount -= count;
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c
index 9233b81..c183c07 100644
--- a/drivers/ide/ide-taskfile.c
+++ b/drivers/ide/ide-taskfile.c
@@ -294,6 +294,8 @@ #endif
 	else
 		taskfile_input_data(drive, buf, SECTOR_WORDS);
 
+	if (!write)
+		flush_kernel_dcache_page(kmap_atomic_to_page(buf));
 	kunmap_atomic(buf, KM_BIO_SRC_IRQ);
 #ifdef CONFIG_HIGHMEM
 	local_irq_restore(flags);
-- 
1.3.2