Dear All,
I'm developing a USB class driver for UAS device. I have modified the
storage driver code as per my custom driver requirements. As a part of
this, I have registered to the scsi layer through following snippet in
the storage_probe function. I have seen the code in one of the SAS
driver's implementation.
static DECLARE_TRANSPORT_CLASS(host_class,
"uas_host", NULL, NULL, NULL);
/*
* Register transport class with SCSI layer
*/
error = transport_class_register(&host_class);
if (error)
goto BadDevice;
/*
* Attach transport template to SCSI layer
* which shall be used for executing tasks and
* task management functions.
*/
transport_template = domain_attach_transport(&transport_functions);
if (!transport_template)
goto BadDevice;
/* Associate transport template to SCSI host transport template */
host->transportt = transport_template;
host->max_id = ~0;
host->max_lun = ~0;
struct scsi_transport_template *
attach_transport(void)
{
struct uas_internal *i;
i = kzalloc(sizeof(struct uas_internal), GFP_KERNEL);
if (!i)
return NULL;
i->t.host_attrs.ac.attrs = &i->host_attrs[0];
i->t.host_attrs.ac.class = &host_class.class;
i->t.host_attrs.ac.match = uas_host_match;
transport_container_register(&i->t.host_attrs);
i->t.host_size = sizeof(struct uas_host_attrs);
return &i->t;
}
struct scsi_transport_template *
domain_attach_transport(struct domain_function_template *dft)
{
struct scsi_transport_template *stt = attach_transport();
if (!stt)
return stt;
i = to_uas_internal(stt);
i->dft = dft;
stt->create_work_queue = 1;
stt->eh_timed_out = uas_scsi_timed_out;
stt->eh_strategy_handler = uas_scsi_recover_host;
return stt;
}
When I insert the device I am able to see the disk drive (fdisk -l).
However, I am continuously getting the following statements
infinitely. I get the INQUIRY command continuously with "Bad Target
Number". For normal usb-storage devices I get this message 7 times and
stops and get the next command like TEST_UNIT_READY.
<scsi_get_command> invoked!
<__scsi_get_command> invoked!
<scsi_dispatch_cmd> invoked!
<drivers/usb/storage/scsiglue.c> <queuecommand> Entry!
<usb_stor_show_command> Entry. Command INQUIRY (6 Bytes)!
Command INQUIRY (6 bytes)
12 00 00 00 24 00
<drivers/usb/storage/scsiglue.c> <queuecommand> Exit!
*** thread awakened
Bad target number (1400:0)
scsi cmd done, result=0x40000
*** thread sleeping
<scsi_finish_command> invoked!
Please suggest me where am I doing wrong. Do I need any other ways to
register the transport layer to SCSI layer.
Any suggestion would help me and it would be appreciated.
Thanks and Regards,
Madhavi M
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