linux-kernel - Re: [PATCH] iommu: remove the iommu_callback

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Date:	Wed, 23 Mar 2016 22:26:15 +0000
From:	Wei Yang <richard.weiyang@...il.com>
To:	Wei Yang <richard.weiyang@...il.com>
Cc:	treding@...dia.com, alex.williamson@...hat.com, joro@...tes.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iommu: remove the iommu_callback_data

Obsolete this one, V2 is sent.

On Sun, Mar 20, 2016 at 01:57:52AM +0000, Wei Yang wrote:
>According to the code path, iommu_callback_data is passed in
>iommu_bus_init() and  just used in {add/remove}_iommu_group, by when the
>bus->iommu_ops is already set up properly.
>
>This patch removes the iommu_callback_data by retrieving iommu_ops from
>bus->iommu_ops directly.
>
>Signed-off-by: Wei Yang <richard.weiyang@...il.com>
>---
> drivers/iommu/iommu.c | 21 ++++++---------------
> 1 file changed, 6 insertions(+), 15 deletions(-)
>
>diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
>index 0e3b009..2696a38 100644
>--- a/drivers/iommu/iommu.c
>+++ b/drivers/iommu/iommu.c
>@@ -37,10 +37,6 @@ static struct kset *iommu_group_kset;
> static struct ida iommu_group_ida;
> static struct mutex iommu_group_mutex;
> 
>-struct iommu_callback_data {
>-	const struct iommu_ops *ops;
>-};
>-
> struct iommu_group {
> 	struct kobject kobj;
> 	struct kobject *devices_kobj;
>@@ -867,8 +863,7 @@ struct iommu_domain *iommu_group_default_domain(struct iommu_group *group)
> 
> static int add_iommu_group(struct device *dev, void *data)
> {
>-	struct iommu_callback_data *cb = data;
>-	const struct iommu_ops *ops = cb->ops;
>+	const struct iommu_ops *ops = dev->bus->iommu_ops;
> 	int ret;
> 
> 	if (!ops->add_device)
>@@ -891,8 +886,7 @@ static int add_iommu_group(struct device *dev, void *data)
> 
> static int remove_iommu_group(struct device *dev, void *data)
> {
>-	struct iommu_callback_data *cb = data;
>-	const struct iommu_ops *ops = cb->ops;
>+	const struct iommu_ops *ops = dev->bus->iommu_ops;
> 
> 	if (ops->remove_device && dev->iommu_group)
> 		ops->remove_device(dev);
>@@ -953,13 +947,10 @@ static int iommu_bus_notifier(struct notifier_block *nb,
> 	return 0;
> }
> 
>-static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
>+static int iommu_bus_init(struct bus_type *bus)
> {
> 	int err;
> 	struct notifier_block *nb;
>-	struct iommu_callback_data cb = {
>-		.ops = ops,
>-	};
> 
> 	nb = kzalloc(sizeof(struct notifier_block), GFP_KERNEL);
> 	if (!nb)
>@@ -971,7 +962,7 @@ static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
> 	if (err)
> 		goto out_free;
> 
>-	err = bus_for_each_dev(bus, NULL, &cb, add_iommu_group);
>+	err = bus_for_each_dev(bus, NULL, NULL, add_iommu_group);
> 	if (err)
> 		goto out_err;
> 
>@@ -980,7 +971,7 @@ static int iommu_bus_init(struct bus_type *bus, const struct iommu_ops *ops)
> 
> out_err:
> 	/* Clean up */
>-	bus_for_each_dev(bus, NULL, &cb, remove_iommu_group);
>+	bus_for_each_dev(bus, NULL, NULL, remove_iommu_group);
> 	bus_unregister_notifier(bus, nb);
> 
> out_free:
>@@ -1012,7 +1003,7 @@ int bus_set_iommu(struct bus_type *bus, const struct iommu_ops *ops)
> 	bus->iommu_ops = ops;
> 
> 	/* Do IOMMU specific setup for this bus-type */
>-	err = iommu_bus_init(bus, ops);
>+	err = iommu_bus_init(bus);
> 	if (err)
> 		bus->iommu_ops = NULL;
> 
>-- 
>2.5.0

-- 
Wei Yang
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