[PATCH] gpu: nova-core: define named constants for magic numbers

[Rhys Lloyd <krakow20@gmail.com>]

Introduce an associated constant `MIN_LEN` for each struct that checks
the length of the input data in its constructor against a magic number.

Signed-off-by: Rhys Lloyd <krakow20@gmail.com>
---
Changes in v2:
- Add commit description
- Fix author to match SoB
- Add base commit

---
 drivers/gpu/nova-core/vbios.rs | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/nova-core/vbios.rs b/drivers/gpu/nova-core/vbios.rs
index 5b5d9f38cbb3..d456c494374d 100644
--- a/drivers/gpu/nova-core/vbios.rs
+++ b/drivers/gpu/nova-core/vbios.rs
@@ -364,8 +364,9 @@ struct BitHeader {
 }
 
 impl BitHeader {
+    const MIN_LEN: usize = 12;
     fn new(data: &[u8]) -> Result<Self> {
-        if data.len() < 12 {
+        if data.len() < Self::MIN_LEN {
             return Err(EINVAL);
         }
 
@@ -467,8 +468,9 @@ struct PciRomHeader {
 }
 
 impl PciRomHeader {
+    const MIN_LEN: usize = 26;
     fn new(pdev: &pci::Device, data: &[u8]) -> Result<Self> {
-        if data.len() < 26 {
+        if data.len() < Self::MIN_LEN {
             // Need at least 26 bytes to read pciDataStrucPtr and sizeOfBlock.
             return Err(EINVAL);
         }
@@ -772,10 +774,11 @@ fn into_image(self) -> Result<BiosImage> {
         BiosImage::try_from(self)
     }
 
+    const MIN_LEN: usize = 26;
     /// Creates a new BiosImageBase from raw byte data.
     fn new(pdev: &pci::Device, data: &[u8]) -> Result<Self> {
         // Ensure we have enough data for the ROM header.
-        if data.len() < 26 {
+        if data.len() < Self::MIN_LEN {
             dev_err!(pdev.as_ref(), "Not enough data for ROM header\n");
             return Err(EINVAL);
         }
@@ -900,8 +903,9 @@ struct PmuLookupTableEntry {
 }
 
 impl PmuLookupTableEntry {
+    const MIN_LEN: usize = 6;
     fn new(data: &[u8]) -> Result<Self> {
-        if data.len() < 6 {
+        if data.len() < Self::MIN_LEN {
             return Err(EINVAL);
         }
 
@@ -928,8 +932,9 @@ struct PmuLookupTable {
 }
 
 impl PmuLookupTable {
+    const MIN_LEN: usize = 4;
     fn new(pdev: &pci::Device, data: &[u8]) -> Result<Self> {
-        if data.len() < 4 {
+        if data.len() < Self::MIN_LEN {
             return Err(EINVAL);
         }
 

base-commit: 215a3f91713383a3c0d2da82d223a608a3c17ac1
prerequisite-patch-id: d80f92d314a0693d4c89ffb7810d9ab6990336fa
-- 
2.50.1