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

["Laszlo Ersek" <lersek@redhat.com>]

On 11/10/23 06:22, Ranbir Singh wrote:
> 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;
>      }

Reviewed-by: Laszlo Ersek <lersek@redhat.com>



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