linux-kernel - [PATCH] libata: clean up ZPODD when a port is detached

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Message-Id: <1399384668-20394-1-git-send-email-levex@linux.com>
Date:	Tue,  6 May 2014 15:57:48 +0200
From:	Levente Kurusa <levex@...ux.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Linux ATA/IDE <linux-ide@...r.kernel.org>,
	Aaron Lu <aaron.lu@...el.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	Joe Thomas <Joe.Thomas@...hill.com>,
	Levente Kurusa <levex@...ux.com>
Subject: [PATCH] libata: clean up ZPODD when a port is detached

When a ZPODD device is unbound via sysfs, the ACPI notify handler
is not removed. This causes panics as observed in Bug #74601. The
panic only happens when the wake happens from outside the kernel
(i.e. inserting a media or pressing a button). Add a loop to
ata_port_detach which loops through the port's devices and checks
if zpodd is enabled, if so call zpodd_exit.

Cc: stable@...r.kernel.org
Reviewed-by: Aaron Lu <aaron.lu@...el.com>
Signed-off-by: Levente Kurusa <levex@...ux.com>
---
 drivers/ata/libata-core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index 943cc8b..ea83828 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6314,6 +6314,8 @@ int ata_host_activate(struct ata_host *host, int irq,
 static void ata_port_detach(struct ata_port *ap)
 {
 	unsigned long flags;
+	struct ata_link *link;
+	struct ata_device *dev;
 
 	if (!ap->ops->error_handler)
 		goto skip_eh;
@@ -6333,6 +6335,13 @@ static void ata_port_detach(struct ata_port *ap)
 	cancel_delayed_work_sync(&ap->hotplug_task);
 
  skip_eh:
+	/* clean up zpodd on port removal */
+	ata_for_each_link(link, ap, HOST_FIRST) {
+		ata_for_each_dev(dev, link, ALL) {
+			if (zpodd_dev_enabled(dev))
+				zpodd_exit(dev);
+		}
+	}
 	if (ap->pmp_link) {
 		int i;
 		for (i = 0; i < SATA_PMP_MAX_PORTS; i++)
-- 
1.8.3.1

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