libata: only ports >= 0 need to synchronize

[linux-2.6-omap-h63xx.git] / drivers / ata / libata-core.c

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 9ae583554c8b79791b42e544caf14648adbfddaf..71218d76d75e482df1a3f43237b936467fb04675 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2001,6 +2001,10 @@ unsigned int ata_pio_need_iordy(const struct ata_device *adev)
           as the caller should know this */
        if (adev->link->ap->flags & ATA_FLAG_NO_IORDY)
                return 0;
+       /* CF spec. r4.1 Table 22 says no iordy on PIO5 and PIO6.  */
+       if (ata_id_is_cfa(adev->id)
+           && (adev->pio_mode == XFER_PIO_5 || adev->pio_mode == XFER_PIO_6))
+               return 0;
        /* PIO3 and higher it is mandatory */
        if (adev->pio_mode > XFER_PIO_2)
                return 1;
@@ -4552,7 +4556,7 @@ void ata_sg_clean(struct ata_queued_cmd *qc)
        struct scatterlist *sg = qc->sg;
        int dir = qc->dma_dir;
 
-       WARN_ON(sg == NULL);
+       WARN_ON_ONCE(sg == NULL);
 
        VPRINTK("unmapping %u sg elements\n", qc->n_elem);
 
@@ -4772,7 +4776,7 @@ void ata_qc_free(struct ata_queued_cmd *qc)
        struct ata_port *ap = qc->ap;
        unsigned int tag;
 
-       WARN_ON(qc == NULL);    /* ata_qc_from_tag _might_ return NULL */
+       WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
 
        qc->flags = 0;
        tag = qc->tag;
@@ -4787,8 +4791,8 @@ void __ata_qc_complete(struct ata_queued_cmd *qc)
        struct ata_port *ap = qc->ap;
        struct ata_link *link = qc->dev->link;
 
-       WARN_ON(qc == NULL);    /* ata_qc_from_tag _might_ return NULL */
-       WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
+       WARN_ON_ONCE(qc == NULL); /* ata_qc_from_tag _might_ return NULL */
+       WARN_ON_ONCE(!(qc->flags & ATA_QCFLAG_ACTIVE));
 
        if (likely(qc->flags & ATA_QCFLAG_DMAMAP))
                ata_sg_clean(qc);
@@ -4874,7 +4878,7 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
                struct ata_device *dev = qc->dev;
                struct ata_eh_info *ehi = &dev->link->eh_info;
 
-               WARN_ON(ap->pflags & ATA_PFLAG_FROZEN);
+               WARN_ON_ONCE(ap->pflags & ATA_PFLAG_FROZEN);
 
                if (unlikely(qc->err_mask))
                        qc->flags |= ATA_QCFLAG_FAILED;
@@ -4996,16 +5000,16 @@ void ata_qc_issue(struct ata_queued_cmd *qc)
         * check is skipped for old EH because it reuses active qc to
         * request ATAPI sense.
         */
-       WARN_ON(ap->ops->error_handler && ata_tag_valid(link->active_tag));
+       WARN_ON_ONCE(ap->ops->error_handler && ata_tag_valid(link->active_tag));
 
        if (ata_is_ncq(prot)) {
-               WARN_ON(link->sactive & (1 << qc->tag));
+               WARN_ON_ONCE(link->sactive & (1 << qc->tag));
 
                if (!link->sactive)
                        ap->nr_active_links++;
                link->sactive |= 1 << qc->tag;
        } else {
-               WARN_ON(link->sactive);
+               WARN_ON_ONCE(link->sactive);
 
                ap->nr_active_links++;
                link->active_tag = qc->tag;
@@ -5916,6 +5920,17 @@ static void async_port_probe(void *data, async_cookie_t cookie)
 {
        int rc;
        struct ata_port *ap = data;
+
+       /*
+        * If we're not allowed to scan this host in parallel,
+        * we need to wait until all previous scans have completed
+        * before going further.
+        * Jeff Garzik says this is only within a controller, so we
+        * don't need to wait for port 0, only for later ports.
+        */
+       if (!(ap->host->flags & ATA_HOST_PARALLEL_SCAN) && ap->port_no != 0)
+               async_synchronize_cookie(cookie);
+
        /* probe */
        if (ap->ops->error_handler) {
                struct ata_eh_info *ehi = &ap->link.eh_info;