>
> I have decided to upgrade my home box from a March -current to the latest
> stuff and now when I connect my HP850 digital camera to the usb port, it
> panics the machine. I got a dump and according to the instruction pointer
> and kldstat, it must be inside the umass, but I think something confuse
> gdb a little because that doesn't show up in the backtrace or maybe it is
> just me not knowing how to convince gdb to tell me:
>
> ###########
> ---
> Fatal trap 12: page fault while in kernel mode
> fault virtual address = 0x10
> fault code = supervisor read, page not present
> instruction pointer = 0x8:0xc0729c26
> stack pointer = 0x10:0xc6317cbc
> frame pointer = 0x10:0xc6317cd0
> code segment = base 0x0, limit 0xfffff, type 0x1b
> = DPL 0, pres 1, def32 1, gran 1
> processor eflags = interrupt enabled, resume, IOPL = 0
> current process = 13 (swi8: tty:sio clock)
> trap number = 12
> panic: page fault
Ok, it seems that when plugging in a device, the contacts can have some
"noise" and you get a disconnect inbetween. If that happens before the
timeout() in umass, bad things can happen. I have added an untimeout()
and now everything seems ok. Patch at the end.
Any comments from people a little more knowledgable in the umass/usb
area?
John
--
John Hay -- [EMAIL PROTECTED] / [EMAIL PROTECTED]
Index: umass.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/usb/umass.c,v
retrieving revision 1.91
diff -u -r1.91 umass.c
--- umass.c 20 Sep 2003 08:18:16 -0000 1.91
+++ umass.c 7 Oct 2003 16:35:45 -0000
@@ -396,6 +396,7 @@
usbd_device_handle sc_udev; /* USB device */
struct cam_sim *umass_sim; /* SCSI Interface Module */
+ struct callout_handle rescanh; /* timeout handle */
unsigned char flags; /* various device flags */
# define UMASS_FLAGS_GONE 0x01 /* devices is no more */
@@ -2165,7 +2166,7 @@
/* XXX This will bomb if the driver is unloaded between attach
* and execution of umass_cam_rescan.
*/
- timeout(umass_cam_rescan, sc, MS_TO_TICKS(200));
+ sc->rescanh = timeout(umass_cam_rescan, sc, MS_TO_TICKS(200));
}
return(0); /* always succesfull */
@@ -2179,6 +2180,7 @@
umass_cam_detach_sim(struct umass_softc *sc)
{
if (sc->umass_sim) {
+ untimeout(umass_cam_rescan, sc, sc->rescanh);
if (xpt_bus_deregister(cam_sim_path(sc->umass_sim)))
cam_sim_free(sc->umass_sim, /*free_devq*/TRUE);
else
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