linux-kernel - [PATCH 3.12 103/123] usb: chipidea: debug: add runtime pm for register access

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Date:	Wed, 28 Oct 2015 14:53:34 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Li Jun <jun.li@...escale.com>,
	Oliver Neukum <ONeukum@...e.com>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 103/123] usb: chipidea: debug: add runtime pm for register access

From: Li Jun <jun.li@...escale.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit bc24937943d9f71a1e32b5dc4e2f0ef8fcc07b64 upstream.

Add runtime pm operations for registers access to avoid system hang.

Signed-off-by: Li Jun <jun.li@...escale.com>
Cc: Oliver Neukum <ONeukum@...e.com>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/chipidea/debug.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/usb/chipidea/debug.c b/drivers/usb/chipidea/debug.c
index 92f0cc442d46..eac6a3212de2 100644
--- a/drivers/usb/chipidea/debug.c
+++ b/drivers/usb/chipidea/debug.c
@@ -62,9 +62,11 @@ static int ci_port_test_show(struct seq_file *s, void *data)
 	unsigned long flags;
 	unsigned mode;
 
+	pm_runtime_get_sync(ci->dev);
 	spin_lock_irqsave(&ci->lock, flags);
 	mode = hw_port_test_get(ci);
 	spin_unlock_irqrestore(&ci->lock, flags);
+	pm_runtime_put_sync(ci->dev);
 
 	seq_printf(s, "mode = %u\n", mode);
 
@@ -94,9 +96,11 @@ static ssize_t ci_port_test_write(struct file *file, const char __user *ubuf,
 	if (sscanf(buf, "%u", &mode) != 1)
 		return -EINVAL;
 
+	pm_runtime_get_sync(ci->dev);
 	spin_lock_irqsave(&ci->lock, flags);
 	ret = hw_port_test_set(ci, mode);
 	spin_unlock_irqrestore(&ci->lock, flags);
+	pm_runtime_put_sync(ci->dev);
 
 	return ret ? ret : count;
 }
@@ -238,8 +242,10 @@ static ssize_t ci_role_write(struct file *file, const char __user *ubuf,
 	if (role == CI_ROLE_END || role == ci->role)
 		return -EINVAL;
 
+	pm_runtime_get_sync(ci->dev);
 	ci_role_stop(ci);
 	ret = ci_role_start(ci, role);
+	pm_runtime_put_sync(ci->dev);
 
 	return ret ? ret : count;
 }
-- 
2.6.2

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