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d1aae06630
Let's use a wrapper struct for the auxiliary_device made in
jh7110_reset_controller_register() so that we can stop casting iomem
pointers. The casts trip up tools like sparse, and make for some awkward
casts that are largely unnecessary. While we're here, change the
allocation from devm and actually free the auxiliary_device memory in
the release function. This avoids any use after free problems where the
parent device driver is unbound from the device but the
auxiliuary_device is still in use accessing devm freed memory.
Cc: Tommaso Merciai <tomm.merciai@gmail.com>
Cc: Emil Renner Berthing <emil.renner.berthing@canonical.com>
Cc: Hal Feng <hal.feng@starfivetech.com>
Cc: Conor Dooley <conor.dooley@microchip.com>
Cc: Xingyu Wu <xingyu.wu@starfivetech.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Fixes: edab7204af ("clk: starfive: Add StarFive JH7110 system clock driver")
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20230413205528.4044216-1-sboyd@kernel.org
73 lines
1.9 KiB
C
73 lines
1.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Reset driver for the StarFive JH7110 SoC
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*
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* Copyright (C) 2022 StarFive Technology Co., Ltd.
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*/
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#include <linux/auxiliary_bus.h>
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#include <soc/starfive/reset-starfive-jh71x0.h>
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#include "reset-starfive-jh71x0.h"
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#include <dt-bindings/reset/starfive,jh7110-crg.h>
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struct jh7110_reset_info {
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unsigned int nr_resets;
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unsigned int assert_offset;
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unsigned int status_offset;
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};
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static const struct jh7110_reset_info jh7110_sys_info = {
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.nr_resets = JH7110_SYSRST_END,
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.assert_offset = 0x2F8,
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.status_offset = 0x308,
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};
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static const struct jh7110_reset_info jh7110_aon_info = {
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.nr_resets = JH7110_AONRST_END,
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.assert_offset = 0x38,
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.status_offset = 0x3C,
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};
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static int jh7110_reset_probe(struct auxiliary_device *adev,
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const struct auxiliary_device_id *id)
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{
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struct jh7110_reset_info *info = (struct jh7110_reset_info *)(id->driver_data);
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struct jh71x0_reset_adev *rdev = to_jh71x0_reset_adev(adev);
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void __iomem *base = rdev->base;
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if (!info || !base)
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return -ENODEV;
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return reset_starfive_jh71x0_register(&adev->dev, adev->dev.parent->of_node,
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base + info->assert_offset,
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base + info->status_offset,
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NULL,
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info->nr_resets,
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NULL);
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}
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static const struct auxiliary_device_id jh7110_reset_ids[] = {
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{
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.name = "clk_starfive_jh7110_sys.rst-sys",
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.driver_data = (kernel_ulong_t)&jh7110_sys_info,
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},
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{
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.name = "clk_starfive_jh7110_sys.rst-aon",
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.driver_data = (kernel_ulong_t)&jh7110_aon_info,
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},
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{ /* sentinel */ }
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};
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MODULE_DEVICE_TABLE(auxiliary, jh7110_reset_ids);
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static struct auxiliary_driver jh7110_reset_driver = {
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.probe = jh7110_reset_probe,
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.id_table = jh7110_reset_ids,
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};
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module_auxiliary_driver(jh7110_reset_driver);
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MODULE_AUTHOR("Hal Feng <hal.feng@starfivetech.com>");
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MODULE_DESCRIPTION("StarFive JH7110 reset driver");
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MODULE_LICENSE("GPL");
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