mirror of
https://github.com/RGBCube/serenity
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af31253a16
The function `KString::must_create()` can only be enforced during early boot (that is, when `g_in_early_boot` is true), hence the use of this function during runtime causes a `VERIFY` to assert, leading to a Kernel Panic. We should instead use `TRY()` along with `try_create()` to prevent this from crashing whenever a USB device is inserted into the system, and we don't have enough memory to allocate the device's KString.
65 lines
2 KiB
C++
65 lines
2 KiB
C++
/*
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* Copyright (c) 2021, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/Bus/USB/USBDevice.h>
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#include <Kernel/FileSystem/SysFS.h>
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#include <Kernel/KBufferBuilder.h>
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#include <Kernel/Locking/Mutex.h>
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namespace Kernel::USB {
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class SysFSUSBDeviceInformation : public SysFSComponent {
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friend class SysFSUSBBusDirectory;
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public:
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virtual ~SysFSUSBDeviceInformation() override;
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static ErrorOr<NonnullRefPtr<SysFSUSBDeviceInformation>> create(USB::Device&);
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virtual StringView name() const override { return m_device_name->view(); }
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RefPtr<USB::Device> device() const { return m_device; }
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protected:
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SysFSUSBDeviceInformation(NonnullOwnPtr<KString> device_name, USB::Device& device);
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virtual ErrorOr<size_t> read_bytes(off_t offset, size_t count, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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IntrusiveListNode<SysFSUSBDeviceInformation, RefPtr<SysFSUSBDeviceInformation>> m_list_node;
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NonnullRefPtr<USB::Device> m_device;
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private:
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ErrorOr<void> try_generate(KBufferBuilder&);
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virtual ErrorOr<void> refresh_data(OpenFileDescription& description) const override;
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mutable Mutex m_lock { "SysFSUSBDeviceInformation" };
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NonnullOwnPtr<KString> m_device_name;
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};
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class SysFSUSBBusDirectory final : public SysFSDirectory {
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public:
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static void initialize();
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static SysFSUSBBusDirectory& the();
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virtual StringView name() const override { return "usb"sv; }
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void plug(USB::Device&);
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void unplug(USB::Device&);
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virtual ErrorOr<void> traverse_as_directory(FileSystemID, Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual RefPtr<SysFSComponent> lookup(StringView name) override;
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private:
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explicit SysFSUSBBusDirectory(SysFSBusDirectory&);
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RefPtr<SysFSUSBDeviceInformation> device_node_for(USB::Device& device);
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IntrusiveList<&SysFSUSBDeviceInformation::m_list_node> m_device_nodes;
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mutable Spinlock m_lock;
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};
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}
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