kernel: fix sysfn 68.30 (unload driver)

- restore the SRV handle after DRV_EXIT (ecx is clobbered by the driver)
- restore esp via ebp: START may be cdecl or stdcall
- pass the SRV to free in eax, not on the stack
- check SRV.base before calling DRV_EXIT

kernel/trunk/core/memory.inc

@@ -1233,25 +1233,27 @@ f68:
         mov     eax, [ecx + SRV.entry]
         test    eax, eax
         jz      .fail
-        push    ecx    ;save handl
+        mov     eax, -2 ;error free RAM
+        cmp     [ecx + SRV.base], 0
+        je      .fail
 
+        push    ecx         ;save handl
+        mov     ebp, esp    ;START may be cdecl or stdcall
         push    edx         ;cmdline
         push    DRV_EXIT
-        call    eax   ;the result is not checked
-        lea     esp, [esp+8]
-        push    ecx
+        call    [ecx + SRV.entry]   ;the result is not checked
+        mov     esp, ebp
+        pop     esi
 
-        mov     ebx, [ecx + SRV.base]
-        mov     eax, -2 ;error free RAM
-        test    ebx, ebx
-        jz      .fail
-        stdcall kernel_free, ebx ;del driver
-
-        mov     eax, [ecx + SRV.fd]
-        mov     edx, [ecx + SRV.bk]
+        mov     eax, [esi + SRV.fd]
+        mov     edx, [esi + SRV.bk]
         mov     [edx + SRV.fd], eax
         mov     [eax + SRV.bk], edx
-        stdcall free, ecx
+        push    eax
+        stdcall kernel_free, [esi + SRV.base] ;del driver
+        mov     eax, esi
+        call    free        ;eax = mem
+        pop     eax
         ;dec     [count_services]
 
         mov     [esp + SYSCALL_STACK.eax], eax

kernel/trunk/network/socket.inc

@@ -1068,11 +1068,6 @@ socket_send_tcp:
 
         DEBUGF  DEBUG_NETWORK_VERBOSE, "SOCKET_send: TCP\n"
 
-; Connection closed or reset by peer?
-
-        test    [eax + SOCKET.state], SS_CANTSENDMORE
-        jnz     .cantsendmore
-
         push    eax
         add     eax, STREAM_SOCKET.snd
         call    socket_ring_write
@@ -1087,16 +1082,6 @@ socket_send_tcp:
         mov     [esp + SYSCALL_STACK.ebx], eax
         ret
 
-  .cantsendmore:
-        mov     ebx, [eax + SOCKET.errorcode]
-        test    ebx, ebx
-        jnz     @f
-        mov     ebx, ENOTCONN
-       @@:
-        mov     [esp + SYSCALL_STACK.ebx], ebx
-        mov     dword[esp + SYSCALL_STACK.eax], -1
-        ret
-
 
 align 4
 socket_send_ip:

kernel/trunk/network/tcp_input.inc

@@ -864,10 +864,6 @@ endl
         mov     [ebx + TCP_SOCKET.t_state], TCPS_CLOSED
         inc     [TCPS_drops]
 
-; Stop the timers, wake up the application
-        mov     eax, ebx
-        call    tcp_cancel_timers
-        call    socket_is_disconnected
 
         jmp     .drop
 

kernel/trunk/network/tcp_output.inc

@@ -63,15 +63,6 @@ endl
 
   .not_idle:
   .again:
-; Connection was reset by peer, send nothing
-        cmp     [eax + TCP_SOCKET.t_state], TCPS_CLOSED
-        jne     @f
-        mov     ebx, [eax + SOCKET.state]
-        and     ebx, SS_CANTSENDMORE + SS_ISDISCONNECTING
-        cmp     ebx, SS_CANTSENDMORE
-        je      .nothing_to_send
-  @@:
-
         mov     [temp_bits], 0
 
 ; Calculate offset
@@ -315,7 +306,6 @@ endl
 ;----------------------------
 ; No reason to send a segment
 
-  .nothing_to_send:
         DEBUGF  DEBUG_NETWORK_VERBOSE, "TCP_output: No reason to send a segment\n"
 
         pusha