From: Tom Yan <tom.ty89@xxxxxxxxx>
Without this fix, the DRA bit of the caching mode page would not
be updated when the read look-ahead feature is toggled (e.g. with
`smartctl --set`), but will only be until, for example, the write
cache feature is touched.
Signed-off-by: Tom Yan <tom.ty89@xxxxxxxxx>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 6be7770..077daf0 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -5127,7 +5127,9 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
switch (qc->tf.command) {
case ATA_CMD_SET_FEATURES:
if (qc->tf.feature != SETFEATURES_WC_ON &&
- qc->tf.feature != SETFEATURES_WC_OFF)
+ qc->tf.feature != SETFEATURES_WC_OFF &&
+ qc->tf.feature != SETFEATURES_RA_ON &&
+ qc->tf.feature != SETFEATURES_RA_OFF)
break;
/* fall through */
case ATA_CMD_INIT_DEV_PARAMS: /* CHS translation changed */
diff --git a/include/linux/ata.h b/include/linux/ata.h
index 99346be..2d68793 100644
--- a/include/linux/ata.h
+++ b/include/linux/ata.h
@@ -409,6 +409,9 @@ enum {
SETFEATURES_WC_ON = 0x02, /* Enable write cache */
SETFEATURES_WC_OFF = 0x82, /* Disable write cache */
+ SETFEATURES_RA_ON = 0xaa, /* Enable read look-ahead */
+ SETFEATURES_RA_OFF = 0x55, /* Disable read look-ahead */
+
/* Enable/Disable Automatic Acoustic Management */
SETFEATURES_AAM_ON = 0x42,
SETFEATURES_AAM_OFF = 0xC2,
--
2.9.0
--
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