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Kernel: Don't update write_pos in DoubleBuffer if userspace copy fails
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@ -47,10 +47,10 @@ ssize_t DoubleBuffer::write(const UserOrKernelBuffer& data, size_t size)
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Locker locker(m_lock);
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size_t bytes_to_write = min(size, m_space_for_writing);
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u8* write_ptr = m_write_buffer->data + m_write_buffer->size;
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m_write_buffer->size += bytes_to_write;
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compute_lockfree_metadata();
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if (!data.read(write_ptr, bytes_to_write))
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return -EFAULT;
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m_write_buffer->size += bytes_to_write;
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compute_lockfree_metadata();
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if (m_unblock_callback && !m_empty)
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m_unblock_callback();
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return (ssize_t)bytes_to_write;
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