kern/94272: exca(4) caused panic

[Artemiev Igor]

>Number:         94272
>Category:       kern
>Synopsis:       exca(4) caused panic
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 09 14:40:12 GMT 2006
>Closed-Date:
>Last-Modified:
>Originator:     Artemiev Igor
>Release:        FreeBSD 7.0-CURRENT i386
>Organization:
Bryansk Medical Center
>Environment:
System: FreeBSD home.sweet.home 7.0-CURRENT FreeBSD 7.0-CURRENT #58: Wen Mar 8 17:27:21 MSK 2006 root at home.sweet.home:/usr/obj/usr/src/sys/ai.home i386

>Description:
With 1.23 revision /sys/dev/exca/exca.c my notebook going to the panic,
when an pccard inserted. Hardware - Compaq Armada M700 with cbb(4) and Intel EtherExpress M16A card.

>How-To-Repeat:
	Just insert pccard into any laptop with PCIC. 

>Fix:
That patch fix this problem:

--- sys/dev/exca/exca.c.orig Thu Mar  9 08:26:13 2006
+++ sys/dev/exca/exca.c  Thu Mar  9 08:26:44 2006
@@ -179,11 +179,11 @@
    struct mem_map_index_st *map;
    struct pccard_mem_handle *mem;
    uint32_t offset;
-   int mem8 = (mem->kind == PCCARD_A_MEM_ATTR);
-   mem8 = 1;
+   int mem8; 

    map = &mem_map_index[win];
    mem = &sc->mem[win];
+   mem8 = (mem->kind == PCCARD_A_MEM_ATTR);
    offset = ((mem->cardaddr >> EXCA_CARDMEM_ADDRX_SHIFT) -
      (mem->addr >> EXCA_SYSMEM_ADDRX_SHIFT)) & 0x3fff;
    exca_putb(sc, map->sysmem_start_lsb,

>Release-Note:
>Audit-Trail:
>Unformatted: