mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-25 13:43:55 +08:00
e9a2310fb6
There is a potential execution path in which function
platform_get_resource() returns NULL. If this happens,
we will end up having a NULL pointer dereference.
Fix this by replacing devm_ioremap with devm_ioremap_resource,
which has the NULL check and the memory region request.
This code was detected with the help of Coccinelle.
Cc: stable@vger.kernel.org
Fixes: 97b7129cd2 ("reset: hisilicon: change the definition of hisi_reset_init")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
133 lines
3.5 KiB
C
133 lines
3.5 KiB
C
/*
|
|
* Hisilicon Reset Controller Driver
|
|
*
|
|
* Copyright (c) 2015-2016 HiSilicon Technologies Co., Ltd.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <linux/io.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/reset-controller.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/spinlock.h>
|
|
#include "reset.h"
|
|
|
|
#define HISI_RESET_BIT_MASK 0x1f
|
|
#define HISI_RESET_OFFSET_SHIFT 8
|
|
#define HISI_RESET_OFFSET_MASK 0xffff00
|
|
|
|
struct hisi_reset_controller {
|
|
spinlock_t lock;
|
|
void __iomem *membase;
|
|
struct reset_controller_dev rcdev;
|
|
};
|
|
|
|
|
|
#define to_hisi_reset_controller(rcdev) \
|
|
container_of(rcdev, struct hisi_reset_controller, rcdev)
|
|
|
|
static int hisi_reset_of_xlate(struct reset_controller_dev *rcdev,
|
|
const struct of_phandle_args *reset_spec)
|
|
{
|
|
u32 offset;
|
|
u8 bit;
|
|
|
|
offset = (reset_spec->args[0] << HISI_RESET_OFFSET_SHIFT)
|
|
& HISI_RESET_OFFSET_MASK;
|
|
bit = reset_spec->args[1] & HISI_RESET_BIT_MASK;
|
|
|
|
return (offset | bit);
|
|
}
|
|
|
|
static int hisi_reset_assert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct hisi_reset_controller *rstc = to_hisi_reset_controller(rcdev);
|
|
unsigned long flags;
|
|
u32 offset, reg;
|
|
u8 bit;
|
|
|
|
offset = (id & HISI_RESET_OFFSET_MASK) >> HISI_RESET_OFFSET_SHIFT;
|
|
bit = id & HISI_RESET_BIT_MASK;
|
|
|
|
spin_lock_irqsave(&rstc->lock, flags);
|
|
|
|
reg = readl(rstc->membase + offset);
|
|
writel(reg | BIT(bit), rstc->membase + offset);
|
|
|
|
spin_unlock_irqrestore(&rstc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hisi_reset_deassert(struct reset_controller_dev *rcdev,
|
|
unsigned long id)
|
|
{
|
|
struct hisi_reset_controller *rstc = to_hisi_reset_controller(rcdev);
|
|
unsigned long flags;
|
|
u32 offset, reg;
|
|
u8 bit;
|
|
|
|
offset = (id & HISI_RESET_OFFSET_MASK) >> HISI_RESET_OFFSET_SHIFT;
|
|
bit = id & HISI_RESET_BIT_MASK;
|
|
|
|
spin_lock_irqsave(&rstc->lock, flags);
|
|
|
|
reg = readl(rstc->membase + offset);
|
|
writel(reg & ~BIT(bit), rstc->membase + offset);
|
|
|
|
spin_unlock_irqrestore(&rstc->lock, flags);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct reset_control_ops hisi_reset_ops = {
|
|
.assert = hisi_reset_assert,
|
|
.deassert = hisi_reset_deassert,
|
|
};
|
|
|
|
struct hisi_reset_controller *hisi_reset_init(struct platform_device *pdev)
|
|
{
|
|
struct hisi_reset_controller *rstc;
|
|
struct resource *res;
|
|
|
|
rstc = devm_kmalloc(&pdev->dev, sizeof(*rstc), GFP_KERNEL);
|
|
if (!rstc)
|
|
return NULL;
|
|
|
|
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
|
|
rstc->membase = devm_ioremap_resource(&pdev->dev, res);
|
|
if (IS_ERR(rstc->membase))
|
|
return NULL;
|
|
|
|
spin_lock_init(&rstc->lock);
|
|
rstc->rcdev.owner = THIS_MODULE;
|
|
rstc->rcdev.ops = &hisi_reset_ops;
|
|
rstc->rcdev.of_node = pdev->dev.of_node;
|
|
rstc->rcdev.of_reset_n_cells = 2;
|
|
rstc->rcdev.of_xlate = hisi_reset_of_xlate;
|
|
reset_controller_register(&rstc->rcdev);
|
|
|
|
return rstc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(hisi_reset_init);
|
|
|
|
void hisi_reset_exit(struct hisi_reset_controller *rstc)
|
|
{
|
|
reset_controller_unregister(&rstc->rcdev);
|
|
}
|
|
EXPORT_SYMBOL_GPL(hisi_reset_exit);
|