Date: Thu, 5 Oct 2000 11:20:15 -0700 (PDT) From: Soren Schmidt <sos@freebsd.dk> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/21773: panic w/nexus + ata (ivar problem) Message-ID: <200010051820.LAA89244@freefall.freebsd.org>
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The following reply was made to PR kern/21773; it has been noted by GNATS.
From: Soren Schmidt <sos@freebsd.dk>
To: jlemon@flugsvamp.com
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: kern/21773: panic w/nexus + ata (ivar problem)
Date: Thu, 5 Oct 2000 20:19:01 +0200 (CEST)
It seems Jonathan Lemon wrote:
>
> After the nexus/ivar change around Sep 28, my kernel no longer
> boots. This seems to be a disagreement over how ivars are used
> in the kernel. Within nexus_alloc_resource(), we have the
> following:
>
> #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev))
> struct nexus_device *ndev = DEVTONX(child);
>
> where ``child'' happens to be ata1. However, within ata/ata-all.c,
> There is the following statement:
>
> device_set_ivars(child, (void *)(uintptr_t) unit);
>
> So when nexus_alloc_resource() is called, it ends up treating the
> unit as a pointer. I'm not sure what the new world order mandates
> here; what is the legal usage of ivar?
Not sure either, but the below patch makes ata use the ivar as a pointer,
could you try that out for me please, I'm still a PRE_SMPNG as i need
working machines....
Index: ata-all.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/ata/ata-all.c,v
retrieving revision 1.74
diff -u -r1.74 ata-all.c
--- ata-all.c 2000/10/05 08:28:06 1.74
+++ ata-all.c 2000/10/05 16:02:49
@@ -358,6 +359,7 @@
ata_pci_add_child(device_t dev, int unit)
{
device_t child;
+ int *ivar;
/* check if this is located at one of the std addresses */
if (ATA_MASTERDEV(dev)) {
@@ -368,7 +370,10 @@
if (!(child = device_add_child(dev, "ata", 2)))
return ENOMEM;
}
- device_set_ivars(child, (void *)(uintptr_t) unit);
+ if (!(ivar = (int *)malloc(sizeof(int *), M_ATA, M_NOWAIT)))
+ return ENOMEM;
+ *ivar = unit;
+ device_set_ivars(child, ivar);
return 0;
}
@@ -492,7 +497,7 @@
ata_pci_print_child(device_t dev, device_t child)
{
struct ata_softc *scp = device_get_softc(child);
- int unit = (uintptr_t) device_get_ivars(child);
+ int unit = *((int *)device_get_ivars(child));
int retval = 0;
retval += bus_print_child_header(dev, child);
@@ -511,7 +516,7 @@
u_long start, u_long end, u_long count, u_int flags)
{
struct ata_pci_softc *sc = device_get_softc(dev);
- int unit = (intptr_t)device_get_ivars(child);
+ int unit = *((int *)device_get_ivars(child));
int myrid;
if (type == SYS_RES_IOPORT) {
@@ -601,7 +606,7 @@
struct resource *r)
{
struct ata_pci_softc *sc = device_get_softc(dev);
- int unit = (uintptr_t) device_get_ivars(child);
+ int unit = *((int *)device_get_ivars(child));
int myrid = 0;
if (type == SYS_RES_IOPORT) {
@@ -725,8 +730,8 @@
struct ata_softc *scp = device_get_softc(dev);
/* kids of pci ata chipsets has their physical unit number in ivars */
- scp->unit = (uintptr_t) device_get_ivars(dev);
+ scp->unit = *((int *)device_get_ivars(dev));
scp->chiptype = pci_get_devid(device_get_parent(dev));
return ata_probe(dev);
}
-Søren
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