[sane-devel] Resend: scanjet 5p, io-error

[abel deuring]

Peter Kirchgessner wrote:
> Hi,
> 
> seems to be a SCSI problem. Opening the SCSI-device is ok. Writing seems 
> also to work. But reading is a problem. You can also have a look at the 
> system log messages. If there are errors reported from the SCSI drivers.


>> [hp] scsi_inquire: sending INQUIRE
>> [hp] scsi_new: sending TEST_UNIT_READY
>> [hp] scsi_flush: writing 2 bytes:
>> [hp]  0x0000  1B 45                                            .E
>> [hp] scsi_flush: writing 7 bytes:
>> [hp]  0x0000  1B 2A 73 32 35 37 45                             .*s257E
>> [hp] scl_inq: read failed (Error during device I/O)
>> [hp] scl_errcheck: Can't read SCL error stack: Error during device I/O
>> [hp] sanei_hp_device_new: SCL reset failed
>> [hp] scsi_close: closing fd 0

[disclaimer: I'm writing this without having a look into older mails, so 
can easily be wrong, but:] Isn't this error similiar to the one we have 
with 2.4 Linux kernels and the Buslogic driver? The latter was caused by 
a "too paranoid" handling of a data over- or underrun by the Buslogic 
driver.

The FREEBSD_CAM_INTERFACE implementation of sanei_scsi_cmd2 in 
sanei_scsi.c has a very simple error handling; especially there is no 
attempt to figure out, which error occured, except for "device busy". 
Perhaps the problem could be fixed by inspecting the CCB in more detail 
in sanei_scsi_cmd2.


Abel