linux-kernel - [PATCH 8/9] Platform: OLPC: move global variables into priv struct

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Message-ID: <20120718212911.0ef38ad5@dev.queued.net>
Date:	Wed, 18 Jul 2012 21:29:11 -0700
From:	Andres Salomon <dilinger@...ued.net>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Paul Fox <pgf@...top.org>, Daniel Drake <dsd@...top.org>,
	"Richard A. Smith" <richard@...top.org>,
	linux-kernel@...r.kernel.org, libertas-dev@...ts.infradead.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	platform-driver-x86@...r.kernel.org, devel@...verdev.osuosl.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Matthew Garrett <mjg@...hat.com>,
	Anton Vorontsov <cbou@...l.ru>,
	David Woodhouse <dwmw2@...radead.org>,
	Chris Ball <cjb@...top.org>,
	Jon Nettleton <jon.nettleton@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH 8/9] Platform: OLPC: move global variables into priv struct

Populate olpc_ec_priv.

Signed-off-by: Andres Salomon <dilinger@...ued.net>
---
 drivers/platform/olpc/olpc-ec.c |   48
++++++++++++++++++++++---------------- 1 files changed, 28
insertions(+), 20 deletions(-)

diff --git a/drivers/platform/olpc/olpc-ec.c
b/drivers/platform/olpc/olpc-ec.c index 1a15a79..0f9f859 100644
--- a/drivers/platform/olpc/olpc-ec.c
+++ b/drivers/platform/olpc/olpc-ec.c
@@ -31,6 +31,12 @@ struct ec_cmd_desc {
 
 struct olpc_ec_priv {
 	struct olpc_ec_driver *drv;
+	struct work_struct worker;
+	struct mutex cmd_lock;
+
+	/* Pending EC commands */
+	struct list_head cmd_q;
+	spinlock_t cmd_q_lock;
 
 	struct dentry *dbgfs_dir;
 
@@ -46,16 +52,9 @@ struct olpc_ec_priv {
 	bool suspended;
 };
 
-static void olpc_ec_worker(struct work_struct *w);
-
-static DECLARE_WORK(ec_worker, olpc_ec_worker);
-static LIST_HEAD(ec_cmd_q);
-static DEFINE_SPINLOCK(ec_cmd_q_lock);
-
 static struct olpc_ec_driver *ec_driver;
 static struct olpc_ec_priv *ec_priv;
 static void *ec_cb_arg;
-static DEFINE_MUTEX(ec_cb_lock);
 
 void olpc_ec_driver_register(struct olpc_ec_driver *drv, void *arg)
 {
@@ -66,49 +65,51 @@ EXPORT_SYMBOL_GPL(olpc_ec_driver_register);
 
 static void olpc_ec_worker(struct work_struct *w)
 {
+	struct olpc_ec_priv *ec = container_of(w, struct olpc_ec_priv,
worker); struct ec_cmd_desc *desc = NULL;
 	unsigned long flags;
 
 	/* Grab the first pending command from the queue */
-	spin_lock_irqsave(&ec_cmd_q_lock, flags);
-	if (!list_empty(&ec_cmd_q)) {
-		desc = list_first_entry(&ec_cmd_q, struct ec_cmd_desc,
node);
+	spin_lock_irqsave(&ec->cmd_q_lock, flags);
+	if (!list_empty(&ec->cmd_q)) {
+		desc = list_first_entry(&ec->cmd_q, struct
ec_cmd_desc, node); list_del(&desc->node);
 	}
-	spin_unlock_irqrestore(&ec_cmd_q_lock, flags);
+	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);
 
 	/* Do we actually have anything to do? */
 	if (!desc)
 		return;
 
 	/* Protect the EC hw with a mutex; only run one cmd at a time
*/
-	mutex_lock(&ec_cb_lock);
+	mutex_lock(&ec->cmd_lock);
 	desc->err = ec_driver->ec_cmd(desc->cmd, desc->inbuf,
desc->inlen, desc->outbuf, desc->outlen, ec_cb_arg);
-	mutex_unlock(&ec_cb_lock);
+	mutex_unlock(&ec->cmd_lock);
 
 	/* Finished, wake up olpc_ec_cmd() */
 	complete(&desc->finished);
 
 	/* Run the worker thread again in case there are more cmds
pending */
-	schedule_work(&ec_worker);
+	schedule_work(&ec->worker);
 }
 
 /*
  * Throw a cmd descripter onto the list.  We now have SMP OLPC
machines, so
  * locking is pretty critical.
  */
-static void queue_ec_descriptor(struct ec_cmd_desc *desc)
+static void queue_ec_descriptor(struct ec_cmd_desc *desc,
+		struct olpc_ec_priv *ec)
 {
 	unsigned long flags;
 
 	INIT_LIST_HEAD(&desc->node);
 
-	spin_lock_irqsave(&ec_cmd_q_lock, flags);
-	list_add_tail(&desc->node, &ec_cmd_q);
-	spin_unlock_irqrestore(&ec_cmd_q_lock, flags);
+	spin_lock_irqsave(&ec->cmd_q_lock, flags);
+	list_add_tail(&desc->node, &ec->cmd_q);
+	spin_unlock_irqrestore(&ec->cmd_q_lock, flags);
 
-	schedule_work(&ec_worker);
+	schedule_work(&ec->worker);
 }
 
 int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t inlen, u8 *outbuf, size_t
outlen) @@ -137,7 +138,7 @@ int olpc_ec_cmd(u8 cmd, u8 *inbuf, size_t
inlen, u8 *outbuf, size_t outlen) desc.err = 0;
 	init_completion(&desc.finished);
 
-	queue_ec_descriptor(&desc);
+	queue_ec_descriptor(&desc, ec);
 
 	/* Timeouts must be handled in the platform-specific EC hook */
 	wait_for_completion(&desc.finished);
@@ -266,7 +267,14 @@ static int olpc_ec_probe(struct platform_device
*pdev) ec = kzalloc(sizeof(*ec), GFP_KERNEL);
 	if (!ec)
 		return -ENOMEM;
+
 	ec->drv = ec_driver;
+	INIT_WORK(&ec->worker, olpc_ec_worker);
+	mutex_init(&ec->cmd_lock);
+
+	INIT_LIST_HEAD(&ec->cmd_q);
+	spin_lock_init(&ec->cmd_q_lock);
+
 	ec_priv = ec;
 	platform_set_drvdata(pdev, ec);
 
-- 
1.7.2.5

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