Messages in this thread | | | Date | Tue, 3 Jun 2003 13:25:04 -0700 | From | Matthew Dharm <> | Subject | Re: [BUG] ieee1394 sbp2 driver is broken for kernel >= 2.4.21-rc2 |
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I know jumping in the middle of a conversation is bad, but....
In conversations with the SBP2 folks, they indicated to me that the way they do hotplugging is very different from the way usb-storage does it. The end result (I'm told) is that invoking a scan from userspace is often needed for SBP2 but never for usb-storage.
So, comparing the two is really pointless.
Matt
On Tue, Jun 03, 2003 at 10:20:19PM +0200, Jocelyn Mayer wrote: > On Tue, 2003-06-03 at 20:54, Ben Collins wrote: > > > First, I never trust hotplug or other tools like this: > > > I do all insmod by hand, so I know all drivers have been loaded. > > > What is hotplug supposed to do (but wasn't in previous driver > > > version...) ? > > > > I didn't say CONFIG_HOTPLUG, I said hotplug. Basically SCSI in 2.4 will > > not let recognize devices that were not present when the scsi-host was > > initially registered with the SCSI stack. You have to run > > rescan-scsi-bus.sh (or manually send the add/remove commands via > > procfs). > > > > Please read the linux-kernel and/or linux1394-devel mailing list > > archives. I really hate dredging this all up again. > > Well, I did understand well hotplug... > I did read what's said about SBP2 on linux1394.org, BUT: > > please read my latest mail, I did some try with the 2.4.21-rc1 ieee1394 > stack, without /sbin/hotplug, and it worked. > I have neither rescan-scsi-bus.sh, nor scsiadd anywhere on this machine. > So, I'm sure that no user-space tool have been called by the kernel. > > - I NEVER need to do an "echo ... > /proc/scsi/scsi" to see the device > (I tell again that I never use automatic tools to do this kind of > low level stuffs). > - I NEVER have to do this to see an USB mass-storage device: > I'm *REALLY* sure of this, as I wrote a very simple hotplug > and automounter for some embedded hardware which uses USB mass > storage devices. So, I don't see why SBP2 should need this... > > - Please take a look at this session: > First, I reboot the Ibook: > > root:~$ reboot > root:~$ > Broadcast message from root (pts/0) (Tue Jun 3 22:06:13 2003): > > The system is going down for reboot NOW! > Connection to mac closed by remote host. > Connection to mac closed. > jma ~ > ssh jocelyn@mac > jocelyn@mac's password: > jocelyn:~$ su - > Password: > root:~$ ls -l /bin/hotplug > ls: /bin/hotplug: No such file or directory > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ cat > /proc/sys/kernel/hotplug > /sbin/hotplug > root:~$ cd /lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394/ > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ./ieee1394.o > > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ./cmp.o > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ cat > /proc/scsi/scsi > > Attached devices: > Host: scsi0 Channel: 00 Id: 00 Lun: 00 > Vendor: SONY Model: CD-RW CRX800E Rev: 1.3p > Type: CD-ROM ANSI SCSI revision: 02 > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ./ohci1394.o > > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ./amdtp.o > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ../scsi/sd_m > od.o > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ insmod > ./sbp2.o > root:/lib/modules/2.4.21-rc6-compat/kernel/drivers/ieee1394$ cat > /proc/scsi/scsi > > Attached devices: > Host: scsi0 Channel: 00 Id: 00 Lun: 00 > Vendor: SONY Model: CD-RW CRX800E Rev: 1.3p > Type: CD-ROM ANSI SCSI revision: 02 > Host: scsi1 Channel: 00 Id: 00 Lun: 00 > Vendor: Maxtor 6 Model: Y080L0 Rev: YAR4 > Type: Direct-Access ANSI SCSI revision: 06 > > > So I NEVER write anything to /proc/scsi/scsi, > I got NO /sbin/hotplug, I use only insmod, > so I can have no side-effect due to modprobe usage, > and it works PERFECTLY on the Ibook, > using the 2.4.21-rc1 ieee1394 stack. > > So, I'm sorry, but I keep thinking the new driver is buggy: > what used to work and doesn't... > > > Regards. > > -- > Jocelyn Mayer <jma@netgem.com> > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/
-- Matthew Dharm Home: mdharm-usb@one-eyed-alien.net Maintainer, Linux USB Mass Storage Driver
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