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Kernel: Make kernel region allocators return KResultOr<NOP<Region>>

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This expands the reach of error propagation greatly throughout the
kernel. Sadly, it also exposes the fact that we're allocating (and
doing other fallible things) in constructors all over the place.

This patch doesn't attempt to address that of course. That's work for
our future selves.
This commit is contained in:
Andreas Kling 2021-09-06 01:36:14 +02:00
parent cb71a73708
commit 75564b4a5f
40 changed files with 173 additions and 193 deletions
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9
Kernel/Bus/USB/USBTransfer.cpp
View file

@ -9,15 +9,12 @@
namespace Kernel::USB {
KResultOr<NonnullRefPtr<Transfer>> Transfer::try_create(Pipe& pipe, u16 len)
KResultOr<NonnullRefPtr<Transfer>> Transfer::try_create(Pipe& pipe, u16 length)
{
// Initialize data buffer for transfer
// This will definitely need to be refactored in the future, I doubt this will scale well...
auto data_buffer = MM.allocate_kernel_region(PAGE_SIZE, "USB Transfer Buffer", Memory::Region::Access::ReadWrite);
if (!data_buffer)
return ENOMEM;
return adopt_nonnull_ref_or_enomem(new (nothrow) Transfer(pipe, len, data_buffer.release_nonnull()));
auto region = TRY(MM.allocate_kernel_region(PAGE_SIZE, "USB Transfer Buffer", Memory::Region::Access::ReadWrite));
return adopt_nonnull_ref_or_enomem(new (nothrow) Transfer(pipe, length, move(region)));
}
Transfer::Transfer(Pipe& pipe, u16 len, NonnullOwnPtr<Memory::Region> data_buffer)