linux-kernel - [PATCH 3.2 052/164] libata: Add helper to determine when PHY events should be ignored

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Message-ID: <lsq.1438473757.688113496@decadent.org.uk>
Date:	Sun, 02 Aug 2015 01:02:37 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Tejun Heo" <tj@...nel.org>,
	"Gabriele Mazzotta" <gabriele.mzt@...il.com>
Subject: [PATCH 3.2 052/164] libata: Add helper to determine when PHY
 events should be ignored

3.2.70-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Gabriele Mazzotta <gabriele.mzt@...il.com>

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@...il.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/ata/libahci.c     |  3 +--
 drivers/ata/libata-core.c | 19 +++++++++++++++++++
 include/linux/libata.h    |  1 +
 3 files changed, 21 insertions(+), 2 deletions(-)

--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1668,8 +1668,7 @@ static void ahci_port_intr(struct ata_po
 	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);
 	}
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6615,6 +6615,25 @@ u32 ata_wait_register(struct ata_port *a
 	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
  */
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -1064,6 +1064,7 @@ extern struct ata_device *ata_dev_pair(s
 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);

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