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Kernel: Make Kernel::VMObject allocation functions return KResultOr

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This makes for nicer handling of errors compared to checking whether a
RefPtr is null. Additionally, this will give way to return different
types of errors in the future.
This commit is contained in:
sin-ack 2021-08-15 09:07:59 +00:00 • committed by Andreas Kling
parent 61c0e3ca92
commit 4bfd6e41b9
26 changed files with 194 additions and 122 deletions
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9
Kernel/Devices/SB16.cpp
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@ -238,10 +238,11 @@ KResultOr<size_t> SB16::write(FileDescription&, u64, const UserOrKernelBuffer& d
if (!page)
return ENOMEM;
auto nonnull_page = page.release_nonnull();
auto vmobject = Memory::AnonymousVMObject::try_create_with_physical_pages({ &nonnull_page, 1 });
if (!vmobject)
return ENOMEM;
m_dma_region = MM.allocate_kernel_region_with_vmobject(*vmobject, PAGE_SIZE, "SB16 DMA buffer", Memory::Region::Access::Write);
auto maybe_vmobject = Memory::AnonymousVMObject::try_create_with_physical_pages({ &nonnull_page, 1 });
if (maybe_vmobject.is_error())
return maybe_vmobject.error();
m_dma_region = MM.allocate_kernel_region_with_vmobject(maybe_vmobject.release_value(), PAGE_SIZE, "SB16 DMA buffer", Memory::Region::Access::Write);
if (!m_dma_region)
return ENOMEM;
}