kernel: ltq-vdsl-vr9: fix multiple compilation warning

Fix multiple compilation warning for fallthrough and unused functions.
Fix compilation warning:
home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_device_vrx.c: In function 'DSL_DRV_VRX_TestParametersFeUpdate':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_device_vrx.c:3359:17: error: unused variable 'nMsgId' [-Werror=unused-variable]
 3359 |    DSL_uint16_t nMsgId = EVT_PMD_TESTPARAMSGET;
      |                 ^~~~~~
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_device_vrx.c: In function 'DSL_DRV_DEV_AutobootHandleTraining':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_device_vrx.c:8310:19: error: this statement may fall through [-Werror=implicit-fallthrough=]
 8310 |          bPreFail = DSL_TRUE;
      |          ~~~~~~~~~^~~~~~~~~~
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_device_vrx.c:8316:7: note: here
 8316 |       case DSL_LINESTATE_EXCEPTION:
      |       ^~~~
cc1: all warnings being treated as errors

/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/pm/drv_dsl_cpe_pm_core.c: In function 'DSL_DRV_PM_CountersReset':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/pm/drv_dsl_cpe_pm_core.c:2328:7: error: this statement may fall through [-Werror=implicit-fallthrough=]
 2328 |    if (ResetType == DSL_PM_RESET_HISTORY)
      |       ^
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/pm/drv_dsl_cpe_pm_core.c:2331:4: note: here
 2331 |    case DSL_PM_RESET_TOTAL:
      |    ^~~~
cc1: all warnings being treated as errors

/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/common/drv_dsl_cpe_os_linux.c: In function 'DSL_ModuleCleanup':
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/common/drv_dsl_cpe_os_linux.c:1266:13: error: assignment to 'dev_t' {aka 'unsigned int'} from 'void *' makes integer from pointer without a cast [-Werror=int-conversion]
 1266 |    dsl_devt = NULL;
      |             ^
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/common/drv_dsl_cpe_os_linux.c: At top level:
/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/common/drv_dsl_cpe_os_linux.c:1178:13: error: 'DSL_DRV_NlSendMsg' defined but not used [-Werror=unused-function]
 1178 | static void DSL_DRV_NlSendMsg(DSL_char_t* pMsg)
      |             ^~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

/home/ansuel/openwrt-ansuel/openwrt/build_dir/target-mips-openwrt-linux-musl_musl/linux-lantiq_xrx200/drv_dsl_cpe_api-4.17.18.6/src/device/drv_dsl_cpe_msg_vrx.c:2459:20: error: 'DSL_DRV_VRX_SpreadArray' defined but not used [-Werror=unused-function]
 2459 | static DSL_Error_t DSL_DRV_VRX_SpreadArray(
      |                    ^~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors

Signed-off-by: Christian Marangi <[email protected]>

package/kernel/lantiq/ltq-vdsl-vr9/patches/300-fix-compilation-warning-fallthrough.patch

@@ -0,0 +1,36 @@
+--- a/src/common/drv_dsl_cpe_api.c
++++ b/src/common/drv_dsl_cpe_api.c
+@@ -1922,7 +1922,7 @@ DSL_Error_t DSL_DRV_AutobootControlSet(
+                }
+                /* no break */
+                /* ... pass to restart*/
+-
++               fallthrough;
+             case DSL_AUTOBOOT_CTRL_RESTART:
+             case DSL_AUTOBOOT_CTRL_RESTART_FULL:
+                if (bAutobootDisable && pData->data.nCommand == DSL_AUTOBOOT_CTRL_RESTART)
+--- a/src/pm/drv_dsl_cpe_pm_core.c
++++ b/src/pm/drv_dsl_cpe_pm_core.c
+@@ -2325,16 +2325,18 @@ DSL_Error_t DSL_DRV_PM_CountersReset(
+       }
+ #endif /* #ifdef INCLUDE_DSL_CPE_PM_HISTORY*/
+ 
+-   if (ResetType == DSL_PM_RESET_HISTORY)
+-      break;
++      if (ResetType == DSL_PM_RESET_HISTORY)
++         break;
+ 
++      fallthrough;
+    case DSL_PM_RESET_TOTAL:
+ #ifdef INCLUDE_DSL_CPE_PM_TOTAL_COUNTERS
+       memset(EpData.pRecTotal, nFillValue, EpData.nEpRecElementSize);
+ #endif /* #ifdef INCLUDE_DSL_CPE_PM_TOTAL_COUNTERS*/
+-   if (ResetType == DSL_PM_RESET_TOTAL)
+-      break;
++      if (ResetType == DSL_PM_RESET_TOTAL)
++         break;
+ 
++      fallthrough;
+    case DSL_PM_RESET_HISTORY_SHOWTIME:
+ #ifdef INCLUDE_DSL_CPE_PM_SHOWTIME_COUNTERS
+       nErrCode = DSL_DRV_PM_HistoryDelete(pContext, EpData.pHistShowtime );

package/kernel/lantiq/ltq-vdsl-vr9/patches/301-fix-compilation-warning-simple-fix.patch

@@ -0,0 +1,132 @@
+--- a/src/common/drv_dsl_cpe_os_linux.c
++++ b/src/common/drv_dsl_cpe_os_linux.c
+@@ -54,7 +54,7 @@ static int DSL_DRV_Release(DSL_DRV_inode_t * ino, DSL_DRV_file_t * fil);
+ 
+ static DSL_uint_t DSL_DRV_Poll(DSL_DRV_file_t *pFile, DSL_DRV_Poll_Table_t *wait);
+ 
+-#ifdef INCLUDE_DSL_CPE_DEBUG_LOGGER_SUPPORT
++#if defined(INCLUDE_DSL_CPE_DEBUG_LOGGER_SUPPORT) && !defined(DSL_DEBUG_DISABLE)
+ static void DSL_DRV_NlSendMsg(DSL_char_t* pMsg);
+ #endif
+ 
+@@ -368,10 +368,10 @@ int DSL_DRV_debug_printf(DSL_Context_t const *pContext, DSL_char_t const *fmt, .
+ {
+    DSL_int_t nRet = 0;
+ #ifndef _lint
+-   DSL_int_t nLength = 0;
+-   DSL_boolean_t bPrint = DSL_FALSE;
+ #ifdef INCLUDE_DSL_CPE_DEBUG_LOGGER_SUPPORT
+ #ifndef DSL_DEBUG_DISABLE
++   DSL_int_t nLength = 0;
++   DSL_boolean_t bPrint = DSL_FALSE;
+    DSL_char_t debugString[DSL_DBG_MAX_DEBUG_PRINT_CHAR + 1] = {0};
+    va_list ap;   /* points to each unnamed arg in turn */
+ 
+@@ -406,6 +406,8 @@ int DSL_DRV_debug_printf(DSL_Context_t const *pContext, DSL_char_t const *fmt, .
+ #endif /* DSL_DEBUG_DISABLE */
+    return nRet;
+ #else
++   DSL_int_t nLength = 0;
++   DSL_boolean_t bPrint = DSL_FALSE;
+    DSL_char_t msg[DSL_DBG_MAX_DEBUG_PRINT_CHAR + 1] = "\0";
+    va_list ap;   /* points to each unnamed arg in turn */
+ 
+@@ -1172,7 +1174,7 @@ static void DSL_DRV_DebugInit(void)
+    return;
+ }
+ 
+-#ifdef INCLUDE_DSL_CPE_DEBUG_LOGGER_SUPPORT
++#if defined(INCLUDE_DSL_CPE_DEBUG_LOGGER_SUPPORT) && !defined(DSL_DEBUG_DISABLE)
+ static void DSL_DRV_NlSendMsg(DSL_char_t* pMsg)
+ {
+    struct nlmsghdr *pNlMsgHdr;
+@@ -1261,7 +1263,7 @@ void __exit DSL_ModuleCleanup(void)
+    printk("Module will be unloaded"DSL_DRV_CRLF);
+ 
+    device_destroy(dsl_class, dsl_devt);
+-   dsl_devt = NULL;
++   dsl_devt = 0;
+    class_destroy(dsl_class);
+    dsl_class = NULL;
+ 
+--- a/src/device/drv_dsl_cpe_msg_vrx.c
++++ b/src/device/drv_dsl_cpe_msg_vrx.c
+@@ -2456,32 +2456,32 @@ DSL_Error_t DSL_DRV_VRX_SendMsgSnrPerGroupesGet(
+ #endif /* defined(INCLUDE_DSL_G997_PER_TONE) || defined(INCLUDE_DSL_DELT)*/
+ 
+ #ifdef INCLUDE_DSL_DELT
+-static DSL_Error_t DSL_DRV_VRX_SpreadArray(
+-   DSL_void_t* pArray,
+-   DSL_uint16_t valueSize,
+-   DSL_uint16_t valueCount,
+-   DSL_uint16_t multiplier)
+-{
+-   DSL_void_t* pSrc = pArray + valueSize * (valueCount - 1);
+-   DSL_void_t* pDst = pArray + valueSize * (valueCount*multiplier - 1);
+-
+-   if (pArray == DSL_NULL)
+-   {
+-      return DSL_ERROR;
+-   }
+-
+-   for (; valueCount; --valueCount, pSrc -= valueSize)
+-   {
+-      DSL_uint16_t i;
+-
+-      for ( i = multiplier; i; --i, pDst -= valueSize)
+-      {
+-         memcpy(pDst,pSrc,valueSize);
+-      }
+-   }
+-
+-   return DSL_SUCCESS;
+-}
++// static DSL_Error_t DSL_DRV_VRX_SpreadArray(
++//    DSL_void_t* pArray,
++//    DSL_uint16_t valueSize,
++//    DSL_uint16_t valueCount,
++//    DSL_uint16_t multiplier)
++// {
++//    DSL_void_t* pSrc = pArray + valueSize * (valueCount - 1);
++//    DSL_void_t* pDst = pArray + valueSize * (valueCount*multiplier - 1);
++
++//    if (pArray == DSL_NULL)
++//    {
++//       return DSL_ERROR;
++//    }
++
++//    for (; valueCount; --valueCount, pSrc -= valueSize)
++//    {
++//       DSL_uint16_t i;
++
++//       for ( i = multiplier; i; --i, pDst -= valueSize)
++//       {
++//          memcpy(pDst,pSrc,valueSize);
++//       }
++//    }
++
++//    return DSL_SUCCESS;
++// }
+ 
+ /**
+    This function requests a set of up to 60 entries of the DELT data.
+--- a/src/device/drv_dsl_cpe_device_vrx.c
++++ b/src/device/drv_dsl_cpe_device_vrx.c
+@@ -3356,7 +3356,9 @@ static DSL_Error_t DSL_DRV_VRX_TestParametersFeUpdate(
+    DSL_Error_t nErrCode = DSL_SUCCESS;
+    DSL_uint16_t i = 0;
+    DSL_uint16_t nDataLen = 0;
++#ifndef DSL_DEBUG_DISABLE
+    DSL_uint16_t nMsgId = EVT_PMD_TESTPARAMSGET;
++#endif /* DSL_DEBUG_DISABLE */
+ 
+    DSL_DEBUG( DSL_DBG_MSG,
+       (pContext, SYS_DBG_MSG"DSL[%02d]: IN - DSL_DRV_VRX_TestParametersFeUpdate"
+@@ -8312,6 +8314,7 @@ DSL_Error_t DSL_DRV_DEV_AutobootHandleTraining(
+             (pContext, SYS_DBG_MSG"DSL[%02d]: ORDERLY_SHUTDOWN state reached"
+             DSL_DRV_CRLF, DSL_DEV_NUM(pContext)));
+          /* do not use break here, continue handling */
++         fallthrough;
+ #endif /* INCLUDE_DSL_CPE_API_VRX */
+       case DSL_LINESTATE_EXCEPTION:
+          if (!bPreFail)