[PATCH] for pre6: hisax user config MAX_CARD and fix potential data trashing

From: Stephan von Krawczynski (skraw@ithnet.com)
Date: Fri Dec 07 2001 - 19:01:57 EST


Hello Karsten,
Hello Kai,
 
attached is the second patch for ISDN-Driver HiSax for kernel-inclusion that does the
following:
 
1) Make HISAX_MAX_CARDS user configurable during make menuconfig

2) Fix a potential trashing of data for the auto-add of SCITEL QUAD card. It did not check at all, if there was enough room to include further cards!

Patch is diffed to 2.4.17-pre6 (yes I am fast :-) and compiles ok.
As it is a bit bigger than originaly intended, can you please comment on it, Kai.
I had to fix the init part, because you can now configure the MAX_CARDS-value _down_ to 1.

Thanks to Keith Owens for Makefile fiddling.

Regards,
Stephan

hisax-max-patch-2:

--- linux/drivers/isdn/Config.in-orig Sat Dec 8 00:35:27 2001
+++ linux/drivers/isdn/Config.in Sat Dec 8 00:35:15 2001
@@ -42,6 +42,7 @@
    fi
    bool ' HiSax Support for german 1TR6' CONFIG_HISAX_1TR6
    bool ' HiSax Support for US NI1' CONFIG_HISAX_NI1
+ int ' Maximum number of cards supported by HiSax' CONFIG_HISAX_MAX_CARDS 8
    comment ' HiSax supported cards'
    bool ' Teles 16.0/8.0' CONFIG_HISAX_16_0
    bool ' Teles 16.3 or PNP or PCMCIA' CONFIG_HISAX_16_3
--- linux/drivers/isdn/hisax/Makefile-orig Sat Dec 8 00:24:43 2001
+++ linux/drivers/isdn/hisax/Makefile Sat Dec 8 00:25:39 2001
@@ -4,6 +4,10 @@
 
 O_TARGET := vmlinux-obj.o
 
+# Define maximum number of cards
+
+EXTRA_CFLAGS += -DHISAX_MAX_CARDS=$(CONFIG_HISAX_MAX_CARDS)
+
 # Objects that export symbols.
 
 export-objs := config.o fsm.o hisax_isac.o
--- linux/drivers/isdn/hisax/hisax.h-orig Sat Dec 8 00:24:20 2001
+++ linux/drivers/isdn/hisax/hisax.h Sat Dec 8 00:40:49 2001
@@ -950,7 +950,9 @@
 #define MON0_TX 4
 #define MON1_TX 8
 
+#ifndef HISAX_MAX_CARDS
 #define HISAX_MAX_CARDS 8
+#endif
 
 #define ISDN_CTYPE_16_0 1
 #define ISDN_CTYPE_8_0 2
--- linux/drivers/isdn/hisax/config.c-orig Sat Dec 8 00:24:26 2001
+++ linux/drivers/isdn/hisax/config.c Sat Dec 8 00:33:57 2001
@@ -336,17 +336,8 @@
         NULL, \
 }
 
-#define EMPTY_CARD {0, DEFAULT_PROTO, {0, 0, 0, 0}, NULL}
-
 struct IsdnCard cards[HISAX_MAX_CARDS] = {
         FIRST_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
- EMPTY_CARD,
 };
 
 #define HISAX_IDSIZE (HISAX_MAX_CARDS*8)
@@ -454,6 +445,7 @@
         i = 0;
         j = 1;
         while (argc && (i < HISAX_MAX_CARDS)) {
+ cards[i].protocol = DEFAULT_PROTO;
                 if (argc) {
                         cards[i].typ = ints[j];
                         j++;
@@ -1405,6 +1397,8 @@
                         cards[j].protocol = protocol[i];
                         nzproto++;
                 }
+ else
+ cards[j].protocol = DEFAULT_PROTO;
                 switch (type[i]) {
                 case ISDN_CTYPE_16_0:
                         cards[j].para[0] = irq[i];
@@ -1481,15 +1475,22 @@
                         } else {
                                 /* QUADRO is a 4 BRI card */
                                 cards[j++].para[0] = 1;
- cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
- cards[j].protocol = protocol[i];
- cards[j++].para[0] = 2;
- cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
- cards[j].protocol = protocol[i];
- cards[j++].para[0] = 3;
- cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
- cards[j].protocol = protocol[i];
- cards[j].para[0] = 4;
+ /* we need to check if further cards can be added */
+ if (j < HISAX_MAX_CARDS) {
+ cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
+ cards[j].protocol = protocol[i];
+ cards[j++].para[0] = 2;
+ }
+ if (j < HISAX_MAX_CARDS) {
+ cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
+ cards[j].protocol = protocol[i];
+ cards[j++].para[0] = 3;
+ }
+ if (j < HISAX_MAX_CARDS) {
+ cards[j].typ = ISDN_CTYPE_SCT_QUADRO;
+ cards[j].protocol = protocol[i];
+ cards[j].para[0] = 4;
+ }
                         }
                         break;
                 }
@@ -1563,6 +1564,8 @@
                 if (protocol[i]) {
                         cards[i].protocol = protocol[i];
                 }
+ else
+ cards[i].protocol = DEFAULT_PROTO;
         }
         cards[0].para[0] = pcm_irq;
         cards[0].para[1] = (int) pcm_iob;
@@ -1603,6 +1606,8 @@
                 if (protocol[i]) {
                         cards[i].protocol = protocol[i];
                 }
+ else
+ cards[i].protocol = DEFAULT_PROTO;
         }
         cards[0].para[0] = pcm_irq;
         cards[0].para[1] = (int) pcm_iob;
@@ -1643,6 +1648,8 @@
                 if (protocol[i]) {
                         cards[i].protocol = protocol[i];
                 }
+ else
+ cards[i].protocol = DEFAULT_PROTO;
         }
         cards[0].para[0] = pcm_irq;
         cards[0].para[1] = (int) pcm_iob;
@@ -1683,6 +1690,8 @@
                 if (protocol[i]) {
                         cards[i].protocol = protocol[i];
                 }
+ else
+ cards[i].protocol = DEFAULT_PROTO;
         }
         cards[0].para[0] = pcm_irq;
         cards[0].para[1] = (int) pcm_iob;
-
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