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Index: linux-3.18-rc7/drivers/ata/libata-core.c
===================================================================
--- linux-3.18-rc7.orig/drivers/ata/libata-core.c
+++ linux-3.18-rc7/drivers/ata/libata-core.c
@@ -1568,6 +1568,14 @@ unsigned ata_exec_internal_sg(struct ata
return AC_ERR_SYSTEM;
}
+ if (ap->ops->acquire_hw && !ap->ops->acquire_hw(ap, 0, 0)) {
+ spin_unlock_irqrestore(ap->lock, flags);
+ if (!ap->ops->acquire_hw(ap, 1, (2*HZ))) {
+ return AC_ERR_TIMEOUT;
+ }
+ spin_lock_irqsave(ap->lock, flags);
+ }
+
/* initialize internal qc */
/* XXX: Tag 0 is used for drivers with legacy EH as some
@@ -4739,6 +4747,9 @@ static struct ata_queued_cmd *ata_qc_new
if (unlikely(ap->pflags & ATA_PFLAG_FROZEN))
return NULL;
+ if (ap->ops->qc_new && ap->ops->qc_new(ap))
+ return NULL;
+
for (i = 0, tag = ap->last_tag + 1; i < max_queue; i++, tag++) {
tag = tag < max_queue ? tag : 0;
@@ -4805,6 +4816,8 @@ void ata_qc_free(struct ata_queued_cmd *
if (likely(ata_tag_valid(tag))) {
qc->tag = ATA_TAG_POISON;
clear_bit(tag, &ap->qc_allocated);
+ if (ap->ops->qc_free)
+ ap->ops->qc_free(qc);
}
}
Index: linux-3.18-rc7/include/linux/libata.h
===================================================================
--- linux-3.18-rc7.orig/include/linux/libata.h
+++ linux-3.18-rc7/include/linux/libata.h
@@ -884,6 +884,8 @@ struct ata_port_operations {
void (*qc_prep)(struct ata_queued_cmd *qc);
unsigned int (*qc_issue)(struct ata_queued_cmd *qc);
bool (*qc_fill_rtf)(struct ata_queued_cmd *qc);
+ int (*qc_new)(struct ata_port *ap);
+ void (*qc_free)(struct ata_queued_cmd *qc);
/*
* Configuration and exception handling
@@ -974,6 +976,9 @@ struct ata_port_operations {
void (*phy_reset)(struct ata_port *ap);
void (*eng_timeout)(struct ata_port *ap);
+ int (*acquire_hw)(struct ata_port *ap, int may_sleep,
+ int timeout_jiffies);
+
/*
* ->inherits must be the last field and all the preceding
* fields must be pointers.
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