Urgent patch for SX.

[Rogier Wolff]

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Hi Marcello, 

Somone messed with the SX driver in 2.4.19. It now detects some cards
twice (both as a V1 and as a V2 card). And as there end up being no
"interlocks", the card is entered twice in the "list of cards". 

This is fixed by adding a check for Version 1 when we really are
really probing for a V1 card and the other way around.

It would be very nice if this could still be accepted into 2.4.20, as
a bunch of people are bitten by this.... 

Honesty requires me to tell you that I haven't been able to fully test
this: I don't have a Version 1 card. But it has been tested with a
Version 2 card and it fixes the double detection problem there. So,
worst case, I think we'll hose support for version 1 cards, produced
in the late nineteen-eighties, or early nineteen-nineties....

				Roger. 

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diff -ur linux-2.4.20-rc1.clean/drivers/char/sx.c linux-2.4.20-rc1.sxfix/drivers/char/sx.c
--- linux-2.4.20-rc1.clean/drivers/char/sx.c	Fri Nov  8 18:13:57 2002
+++ linux-2.4.20-rc1.sxfix/drivers/char/sx.c	Fri Nov  8 18:16:55 2002
@@ -2216,6 +2216,23 @@
 		}
 	}
 
+	/* Now we're pretty much convinced that there is an SI board here, 
+	   but to prevent trouble, we'd better double check that we don't
+	   have an SI1 board when we're probing for an SI2 board.... */
+
+	write_sx_byte (board, SI2_ISA_ID_BASE,0x10); 
+	if ( IS_SI1_BOARD(board)) {
+		/* This should be an SI1 board, which has this
+		   location writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) != 0x10)
+			return 0; 
+	} else {
+		/* This should be an SI2 board, which has the bottom
+		   3 bits non-writable... */
+		if (read_sx_byte (board, SI2_ISA_ID_BASE) == 0x10)
+			return 0; 
+	}
+
 	printheader ();
 
 	printk (KERN_DEBUG "sx: Found an SI board at %lx\n", board->hw_base);

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