Hi All,
I'm working on a target module for scsi_tgt to work with libfc / fcoe
in Linux 2.6.33.5. I'm missing some step in handling completion of
a request.
After each Inquiry or READ operation, in the transfer_response
callback I send the data and response and then call the (*done)()
routine.
I figure I must be missing something, because I get this WARNING:
[ 271.521650] ------------[ cut here ]------------
[ 271.521658] WARNING: at block/blk-core.c:1080 __blk_put_request+0x4f/0xbe()
[ 271.521660] Hardware name: <snip>
[ 271.521662] Modules linked in: libfc_tgt scsi_tgt nfs lockd nfs_acl auth_rpcgss autofs4 sunrpc ip6t_REJECT
nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 dm_multipath uinput fnic libfcoe libfc enic i2c_i801
iTCO_wdt serio_raw scsi_transport_fc iTCO_vendor_support pcspkr e1000e shpchp radeon ttm drm_kms_helper drm
i2c_algo_bit i2c_core
[ 271.521705] Pid: 2769, comm: scsi_tgtd/2 Tainted: G W 2.6.33.5-ftgt #9
[ 271.521708] Call Trace:
[ 271.521715] [<ffffffff811696ae>] ? __blk_put_request+0x4f/0xbe
[ 271.521720] [<ffffffff81041462>] warn_slowpath_common+0x77/0xa4
[ 271.521724] [<ffffffff8104149e>] warn_slowpath_null+0xf/0x11
[ 271.521728] [<ffffffff811696ae>] __blk_put_request+0x4f/0xbe
[ 271.521735] [<ffffffffa02b14b7>] scsi_host_put_command+0x52/0x80 [scsi_tgt]
[ 271.521740] [<ffffffffa02b14e5>] ? scsi_tgt_cmd_destroy+0x0/0x3f [scsi_tgt]
[ 271.521745] [<ffffffffa02b151f>] scsi_tgt_cmd_destroy+0x3a/0x3f [scsi_tgt]
[ 271.521751] [<ffffffff810513a0>] worker_thread+0x131/0x1bd
[ 271.521756] [<ffffffff81054bfc>] ? autoremove_wake_function+0x0/0x38
[ 271.521760] [<ffffffff8105126f>] ? worker_thread+0x0/0x1bd
[ 271.521764] [<ffffffff810547fe>] kthread+0x7d/0x85
[ 271.521770] [<ffffffff810099a4>] kernel_thread_helper+0x4/0x10
[ 271.521774] [<ffffffff81054781>] ? kthread+0x0/0x85
[ 271.521779] [<ffffffff810099a0>] ? kernel_thread_helper+0x0/0x10
[ 271.521782] ---[ end trace 096013af4d0a82a0 ]---
It's this code in block/blk-core.c:
void __blk_put_request(struct request_queue *q, struct request *req)
{
if (unlikely(!q))
return;
if (unlikely(--req->ref_count))
return;
elv_completed_request(q, req);
/* this is a bio leak */
WARN_ON(req->bio != NULL);
...
So, what should I be doing to tell the block layer that the request is done?
Or, is there something that scsi_tgt should be doing to disassociate the bio
from the req?
Thanks,
Joe
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