dc395x.c: Please, contact ... to help improve support ...

Hello,

(please CC, I'm not subscribed)

I got during a backup the following messages in the system log:

Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:44:08 PINGUIN drivers/scsi/dc395x.c: Please, contact 
<[email protected]> to help improve support
for your system.
Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:44:08 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:46:30 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 03:46:30 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:36:21 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:36:21 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed
Mar  8 04:39:22 PINGUIN dc395x: sg_update_list: sg_to_virt failed

It is an opteron, 1GB RAM, a Tekram DC-315U controller with a HP DDS4 tape drive, connected with a narrow->wide SCSI adaptor.

Some info:

Linux PINGUIN 2.6.15.6 #15 Mon Mar 6 11:30:52 CET 2006 x86_64 x86_64 x86_64 GNU/Linux

Mar  7 19:31:01 PINGUIN dc395x: Tekram DC395(U/UW/F), DC315(U) - ASIC 
TRM-S1040 v2.05, 2004/03/08
Mar  7 19:31:01 PINGUIN GSI 19 sharing vector 0xC1 and IRQ 19
Mar  7 19:31:01 PINGUIN ACPI: PCI Interrupt 0000:00:0e.0[A] -> GSI 19 (level, 
low) -> IRQ 19
Mar  7 19:31:01 PINGUIN dc395x: Used settings: AdapterID=07, Speed=0(20.0MHz), 
dev_mode=0x57
Mar  7 19:31:01 PINGUIN dc395x:                AdaptMode=0x0f, Tags=4(16), 
DelayReset=1s
Mar  7 19:31:01 PINGUIN dc395x: Connectors: int50  Termination: Auto Low High
Mar  7 19:31:01 PINGUIN dc395x: Performing initial SCSI bus reset
Mar  7 19:31:01 PINGUIN scsi0 : Tekram DC395(U/UW/F), DC315(U) - ASIC 
TRM-S1040 v2.05, 2004/03/08
Mar  7 19:31:01 PINGUIN dc395x: Target 03:  Sync: 48ns Offset 15 (20.8 MB/s)
Mar  7 19:31:01 PINGUIN Vendor: HP        Model: C5683A            Rev: C111
Mar  7 19:31:01 PINGUIN Type:   Sequential-Access                  ANSI SCSI 
revision: 02
Mar  7 19:31:01 PINGUIN st: Version 20050830, fixed bufsize 1048576, s/g segs 
256
Mar  7 19:31:01 PINGUIN st 0:0:3:0: Attached scsi tape st0<4>st0: try direct 

i/o: yes (alignment 512 B), max page re
achable by HBA 1048575

Some things I should do ?

S.

Thanks for writing! You are the second one. The short background why this message was put in the driver - there is a known bug in the driver, which is hard to trigger, so, we couldn't test our bugfixes. Now that you wrote to the list, I see that you also have a 64-bit system, as well as the first reporter. Unlike him, you have a tape-drive on the bus, he had a scanner. But in both cases it's not a block device - whether or not that is relevant. For comparison - on my 32-bit system neither a scanner nor a tape trigger this path.

Do you have those messages "sg_to_virt failed" reproducibly? Does the tape work after that?

Sure. If you have some spare time to test a couple of patches we could try some patches. I think, we annoyed the list enough with the first reporter, so, we can as well take it off-list. The first reporter seems to have no time for further testing at the moment, so, if you want to play with the driver a bit just reply off-list to me.

Thanks
Guennadi
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Guennadi Liakhovetski