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Kernel/USB: Use allocate_kernel_region in Transfer buffer allocations

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Previously it would create a contiguous AVMO manually and pass it to
MM. This uses supervisor pages that quickly run out as they never get
returned and crash the system.

Instead, use allocate_kernel_region as we're only allocating a page so
it will be contiguous and will be returned when destroyed.

A potentially better solution would be to use a pool of transfers to
avoid all the allocations. This just prevents the system from crashing
within ~5 seconds from the continuous hub polling.
This commit is contained in:
Luke 2021-08-11 22:59:32 +01:00 • committed by Andreas Kling
parent 1ca5b6caa9
commit 14da080dcf
2 changed files with 19 additions and 19 deletions
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14
Kernel/Bus/USB/USBTransfer.h
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@ -23,7 +23,7 @@ public:
public:
Transfer() = delete;
Transfer(Pipe& pipe, u16 len, Memory::AnonymousVMObject&);
Transfer(Pipe& pipe, u16 len, NonnullOwnPtr<Memory::Region>);
~Transfer();
void set_setup_packet(const USBRequestData& request);
@ -41,11 +41,11 @@ public:
bool error_occurred() const { return m_error_occurred; }
private:
Pipe& m_pipe; // Pipe that initiated this transfer
USBRequestData m_request; // USB request
OwnPtr<Memory::Region> m_data_buffer; // DMA Data buffer for transaction
u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
bool m_complete { false }; // Has this transfer been completed?
bool m_error_occurred { false }; // Did an error occur during this transfer?
Pipe& m_pipe; // Pipe that initiated this transfer
USBRequestData m_request; // USB request
NonnullOwnPtr<Memory::Region> m_data_buffer; // DMA Data buffer for transaction
u16 m_transfer_data_size { 0 }; // Size of the transfer's data stage
bool m_complete { false }; // Has this transfer been completed?
bool m_error_occurred { false }; // Did an error occur during this transfer?
};
}