RGBCube/serenity
1
Fork 0
mirror of https://github.com/RGBCube/serenity synced 2025-07-26 19:17:35 +00:00
Code Issues Activity Actions

Kernel: Remove bogus VMObject resizing in VirtIOGPU

Browse source 
It is not legal to resize a VMObject after it has been created.
As far as I can tell, this code would never actually run since the
object was already populated with physical pages due to using
AllocationStrategy::AllocateNow.
This commit is contained in:
Andreas Kling 2021-07-11 17:06:13 +02:00
parent 055726ecf5
commit 846685fca2
2 changed files with 2 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

13
Kernel/Graphics/VirtIOGPU/VirtIOGPU.cpp
View file

@ -127,20 +127,9 @@ VirtIOGPUResourceID VirtIOGPU::create_2d_resource(VirtIOGPURect rect)
return resource_id;
}
void VirtIOGPU::ensure_backing_storage(Region& region, size_t buffer_offset, size_t buffer_length, VirtIOGPUResourceID resource_id)
void VirtIOGPU::ensure_backing_storage(Region const& region, size_t buffer_offset, size_t buffer_length, VirtIOGPUResourceID resource_id)
{
VERIFY(m_operation_lock.is_locked());
// Allocate backing region
auto& vm_object = region.vmobject();
size_t desired_num_pages = page_round_up(buffer_offset + buffer_length);
auto& pages = vm_object.physical_pages();
for (size_t i = pages.size(); i < desired_num_pages / PAGE_SIZE; ++i) {
auto page = MM.allocate_user_physical_page();
// FIXME: Instead of verifying, fail the framebuffer resize operation
VERIFY(!page.is_null());
pages.append(move(page));
}
region.remap();
VERIFY(buffer_offset % PAGE_SIZE == 0);
VERIFY(buffer_length % PAGE_SIZE == 0);