[edk2-devel] [PATCH v3 2/2] MdeModulePkg/Bus/Pci/XhciDxe: Fix MISSING_BREAK Coverity issues

["Ranbir Singh" <rsingh@ventanamicro.com>]

From: Ranbir Singh <Ranbir.Singh3@Dell.com>

The functions
XhcInitializeEndpointContext and XhcInitializeEndpointContext64 has
a switch-case code in which the case USB_ENDPOINT_CONTROL: falls
through to default:

While this may be intentional, it may not be evident to any general code
reader/developer or static analyis tool why there is no break in between.

Merge the USB_ENDPOINT_CONTROL and default using conditional debug print.

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=4221

Cc: Ray Ni <ray.ni@intel.com>
Signed-off-by: Ranbir Singh <rsingh@ventanamicro.com>
---
 MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c | 33 +++++++++++---------
 1 file changed, 19 insertions(+), 14 deletions(-)

diff --git a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
index 05528a478baf..00b3a13a95bb 100644
--- a/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
+++ b/MdeModulePkg/Bus/Pci/XhciDxe/XhciSched.c
@@ -2825,6 +2825,7 @@ XhcInitializeEndpointContext (
   UINTN                    NumEp;
   UINTN                    EpIndex;
   UINT8                    EpAddr;
+  UINT8                    EpType;
   UINT8                    Direction;
   UINT8                    Dci;
   UINT8                    MaxDci;
@@ -2871,7 +2872,8 @@ XhcInitializeEndpointContext (
       InputContext->EP[Dci-1].MaxBurstSize = 0x0;
     }
 
-    switch (EpDesc->Attributes & USB_ENDPOINT_TYPE_MASK) {
+    EpType = EpDesc->Attributes & USB_ENDPOINT_TYPE_MASK;
+    switch (EpType) {
       case USB_ENDPOINT_BULK:
         if (Direction == EfiUsbDataIn) {
           InputContext->EP[Dci-1].CErr   = 3;
@@ -2974,13 +2976,13 @@ XhcInitializeEndpointContext (
 
         break;
 
-      case USB_ENDPOINT_CONTROL:
-        //
-        // Do not support control transfer now.
-        //
-        DEBUG ((DEBUG_INFO, "XhcInitializeEndpointContext: Unsupport Control EP found, Transfer ring is not allocated.\n"));
       default:
-        DEBUG ((DEBUG_INFO, "XhcInitializeEndpointContext: Unknown EP found, Transfer ring is not allocated.\n"));
+        DEBUG ((
+          DEBUG_INFO,
+          "%a: %a found, Transfer ring is not allocated.\n",
+          __func__,
+          (EpType == USB_ENDPOINT_CONTROL ? "Unsupported Control EP" : "Unknown EP")
+          ));
         EpDesc = (USB_ENDPOINT_DESCRIPTOR *)((UINTN)EpDesc + EpDesc->Length);
         continue;
     }
@@ -3028,6 +3030,7 @@ XhcInitializeEndpointContext64 (
   UINTN                    NumEp;
   UINTN                    EpIndex;
   UINT8                    EpAddr;
+  UINT8                    EpType;
   UINT8                    Direction;
   UINT8                    Dci;
   UINT8                    MaxDci;
@@ -3074,7 +3077,8 @@ XhcInitializeEndpointContext64 (
       InputContext->EP[Dci-1].MaxBurstSize = 0x0;
     }
 
-    switch (EpDesc->Attributes & USB_ENDPOINT_TYPE_MASK) {
+    EpType = EpDesc->Attributes & USB_ENDPOINT_TYPE_MASK;
+    switch (EpType) {
       case USB_ENDPOINT_BULK:
         if (Direction == EfiUsbDataIn) {
           InputContext->EP[Dci-1].CErr   = 3;
@@ -3177,13 +3181,14 @@ XhcInitializeEndpointContext64 (
 
         break;
 
-      case USB_ENDPOINT_CONTROL:
-        //
-        // Do not support control transfer now.
-        //
-        DEBUG ((DEBUG_INFO, "XhcInitializeEndpointContext64: Unsupport Control EP found, Transfer ring is not allocated.\n"));
       default:
-        DEBUG ((DEBUG_INFO, "XhcInitializeEndpointContext64: Unknown EP found, Transfer ring is not allocated.\n"));
+        DEBUG ((
+          DEBUG_INFO,
+          "%a: %a found, Transfer ring is not allocated.\n",
+          __func__,
+          ((EpType == USB_ENDPOINT_CONTROL) ? "Unsupported Control EP" : "Unknown EP")
+          ));
+
         EpDesc = (USB_ENDPOINT_DESCRIPTOR *)((UINTN)EpDesc + EpDesc->Length);
         continue;
     }
-- 
2.34.1



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