libata: Add helper to determine when PHY events should be ignored

commit 8393b811f38acdf7fd8da2028708edad3e68ce1f upstream.

This is a preparation commit that will allow to add other criteria
according to which PHY events should be dropped.

Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index de2802c..d23aeb9 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1668,8 +1668,7 @@ static void ahci_port_intr(struct ata_port *ap)
        if (unlikely(resetting))
                status &= ~PORT_IRQ_BAD_PMP;
 
-       /* if LPM is enabled, PHYRDY doesn't mean anything */
-       if (ap->link.lpm_policy > ATA_LPM_MAX_POWER) {
+       if (sata_lpm_ignore_phy_events(&ap->link)) {
                status &= ~PORT_IRQ_PHYRDY;
                ahci_scr_write(&ap->link, SCR_ERROR, SERR_PHYRDY_CHG);
        }

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 5d8fc3d..2c02208 100644 (file)
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6615,6 +6615,25 @@ u32 ata_wait_register(struct ata_port *ap, void __iomem *reg, u32 mask, u32 val,
        return tmp;
 }
 
+/**
+ *     sata_lpm_ignore_phy_events - test if PHY event should be ignored
+ *     @link: Link receiving the event
+ *
+ *     Test whether the received PHY event has to be ignored or not.
+ *
+ *     LOCKING:
+ *     None:
+ *
+ *     RETURNS:
+ *     True if the event has to be ignored.
+ */
+bool sata_lpm_ignore_phy_events(struct ata_link *link)
+{
+       /* if LPM is enabled, PHYRDY doesn't mean anything */
+       return !!(link->lpm_policy > ATA_LPM_MAX_POWER);
+}
+EXPORT_SYMBOL_GPL(sata_lpm_ignore_phy_events);
+
 /*
  * Dummy port_ops
  */

diff --git a/include/linux/libata.h b/include/linux/libata.h
index 42ac6ad..be928ca 100644 (file)
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1064,6 +1064,7 @@ extern struct ata_device *ata_dev_pair(struct ata_device *adev);
 extern int ata_do_set_mode(struct ata_link *link, struct ata_device **r_failed_dev);
 extern void ata_scsi_port_error_handler(struct Scsi_Host *host, struct ata_port *ap);
 extern void ata_scsi_cmd_error_handler(struct Scsi_Host *host, struct ata_port *ap, struct list_head *eh_q);
+extern bool sata_lpm_ignore_phy_events(struct ata_link *link);
 
 extern int ata_cable_40wire(struct ata_port *ap);
 extern int ata_cable_80wire(struct ata_port *ap);