Replace the nova-core local `DmaObject` with a `Coherent` that can
fulfill the same role.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
 drivers/gpu/nova-core/fb.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/nova-core/fb.rs b/drivers/gpu/nova-core/fb.rs
index 6536d0035cb1..ba971a114a06 100644
--- a/drivers/gpu/nova-core/fb.rs
+++ b/drivers/gpu/nova-core/fb.rs
@@ -7,6 +7,7 @@
 
 use kernel::{
     device,
+    dma::Coherent,
     fmt,
     prelude::*,
     ptr::{
@@ -18,7 +19,6 @@
 };
 
 use crate::{
-    dma::DmaObject,
     driver::Bar0,
     firmware::gsp::GspFirmware,
     gpu::Chipset,
@@ -52,7 +52,7 @@ pub(crate) struct SysmemFlush {
     chipset: Chipset,
     device: ARef<device::Device>,
     /// Keep the page alive as long as we need it.
-    page: DmaObject,
+    page: Coherent<[u8]>,
 }
 
 impl SysmemFlush {
@@ -62,7 +62,7 @@ pub(crate) fn register(
         bar: &Bar0,
         chipset: Chipset,
     ) -> Result<Self> {
-        let page = DmaObject::new(dev, kernel::page::PAGE_SIZE)?;
+        let page = Coherent::zeroed_slice(dev, kernel::page::PAGE_SIZE, GFP_KERNEL)?;
 
         hal::fb_hal(chipset).write_sysmem_flush_page(bar, page.dma_handle())?;
 

-- 
2.53.0