User: Password:
Subscribe / Log in / New account

[68/93] [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c

From:  Greg KH <>
Subject:  [68/93] [libata] Call flush_dcache_page after PIO data transfers in libata-sff.c
Date:  Fri, 19 Feb 2010 08:30:01 -0800
Cc:,,,, Catalin Marinas <>, Jeff Garzik <>
Archive-link:  Article, Thread

2.6.32-stable review patch.  If anyone has any objections, please let us know.


From: Catalin Marinas <>

commit 2d68b7fe55d9e19a8a868224ed0dfd6526568521 upstream.

flush_dcache_page() must be called after (!ATA_TFLAG_WRITE) the
data copying to avoid D-cache aliasing with user space or I-D cache
coherency issues (when reading data from an ATA device using PIO,
the kernel dirties the D-cache but there is no flush_dcache_page()
required on Harvard architectures).

Signed-off-by: Catalin Marinas <>
Signed-off-by: Jeff Garzik <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/ata/libata-sff.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/ata/libata-sff.c
+++ b/drivers/ata/libata-sff.c
@@ -893,6 +893,9 @@ static void ata_pio_sector(struct ata_qu
+	if (!do_write)
+		flush_dcache_page(page);
 	qc->curbytes += qc->sect_size;
 	qc->cursg_ofs += qc->sect_size;

(Log in to post comments)

Copyright © 2010, Eklektix, Inc.
Comments and public postings are copyrighted by their creators.
Linux is a registered trademark of Linus Torvalds