Re: s390 lcs incorrect test

[Frank Pavlic]

I agree , it's really weird ...

Thank you Greg for the patch ...


Mit  freundlichen Grüssen / Best regards
Frank Pavlic
 
Linux for eServer Development
Schoenaicher Str. 220, 71032 Boeblingen
Phone:  ext. +49-(0)7031/16-2463, int. *120-2463
mailto:   pavlic@xxxxxxxxxx






Greg Smith <gsmith@xxxxxxxxx> 
27.04.2006 02:05

To
linux-kernel@xxxxxxxxxxxxxxx
cc
mschwid2@xxxxxxxxxxxxxxxxxxxxxxx, Frank Pavlic/Germany/IBM@IBMDE
Subject
s390 lcs incorrect test






While debugging why our LCS emulator is having some problems I noticed
the following weirdness in drivers/s390/net/lcs.c routine lcs_irq:

--- lcs.c.orig           2006-04-24 16:20:24.000000000 -0400
+++ lcs.c                2006-04-26 19:56:45.000000000 -0400
@@ -1354,7 +1354,7 @@
                                 index = (struct ccw1 *) __va((addr_t) 
irb->scsw.cpa) 
                                                 - channel->ccws;
                                 if ((irb->scsw.actl & 
SCSW_ACTL_SUSPENDED) ||
-                                    (irb->scsw.cstat | SCHN_STAT_PCI))
+                                    (irb->scsw.cstat & SCHN_STAT_PCI))
                                                 /* Bloody io subsystem 
tells us lies about cpa... */
                                                 index = (index - 1) & 
(LCS_NUM_BUFFS - 1);
                                 while (channel->io_idx != index) {

The `if' statement is always true since SCHN_STAT_PCI is defined as
0x80.  Don't know if this has anything to do with our LCS problems but
thought I would pass it on.

Greg Smith




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