3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vincent Pelletier <plr.vinc...@gmail.com>
commit 966fbe193f47c68e70a80ec9991098e88e7959cb upstream.
Some device require DMADIR to be enabled, but are not detected as such
by atapi_id_dmadir. One such example is "Asus Serillel 2"
SATA-host-to-PATA-device bridge: the bridge itself requires DMADIR,
even if the bridged device does not.
As atapi_dmadir module parameter can cause problems with some devices
(as per Tejun Heo's memory), enabling it globally may not be possible
depending on the hardware.
This patch adds atapi_dmadir in the form of a "force" horkage value,
allowing global, per-bus and per-device control.
Signed-off-by: Vincent Pelletier <plr.vinc...@gmail.com>
Signed-off-by: Tejun Heo <t...@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
Documentation/kernel-parameters.txt | 2 ++
drivers/ata/libata-core.c | 3 ++-
include/linux/libata.h | 1 +
3 files changed, 5 insertions(+), 1 deletion(-)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1456,6 +1456,8 @@ bytes respectively. Such letter suffixes
* dump_id: dump IDENTIFY data.
+ * atapi_dmadir: Enable ATAPI DMADIR bridge support
+
If there are multiple matching configurations changing
the same attribute, the last one is used.
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2401,7 +2401,7 @@ int ata_dev_configure(struct ata_device
cdb_intr_string = ", CDB intr";
}
- if (atapi_dmadir || atapi_id_dmadir(dev->id)) {
+ if (atapi_dmadir || (dev->horkage & ATA_HORKAGE_ATAPI_DMADIR)
|| atapi_id_dmadir(dev->id)) {
dev->flags |= ATA_DFLAG_DMADIR;
dma_dir_string = ", DMADIR";
}
@@ -6506,6 +6506,7 @@ static int __init ata_parse_force_one(ch
{ "nosrst", .lflags = ATA_LFLAG_NO_SRST },
{ "norst", .lflags = ATA_LFLAG_NO_HRST |
ATA_LFLAG_NO_SRST },
{ "rstonce", .lflags = ATA_LFLAG_RST_ONCE },
+ { "atapi_dmadir", .horkage_on = ATA_HORKAGE_ATAPI_DMADIR },
};
char *start = *cur, *p = *cur;
char *id, *val, *endp;
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -399,6 +399,7 @@ enum {
ATA_HORKAGE_BROKEN_FPDMA_AA = (1 << 15), /* skip AA */
ATA_HORKAGE_DUMP_ID = (1 << 16), /* dump IDENTIFY data */
ATA_HORKAGE_MAX_SEC_LBA48 = (1 << 17), /* Set max sects to 65535 */
+ ATA_HORKAGE_ATAPI_DMADIR = (1 << 18), /* device requires dmadir */
/* DMA mask for user DMA control: User visible values; DO NOT
renumber */
--
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