IB/srp: Code style fix
scsi_transport_srp: Eliminate rport->deleted
IB/srp: Fail SCSI commands silently

Do not log SCSI command failures that are the result of a transport
layer failure, a SCSI abort or SCSI reset. This patch is a slightly
modified version of a patch posted by Sebastian Riemer in March 2013
(see also http://thread.gmane.org/gmane.linux.drivers.rdma/15020/).
v2.0.15
IB/srp: Make writing into the add_target sysfs attribute interruptible
IB/srp: Avoid that writing into "add_target" hangs due to a cable pull

Call Trace:
 [<ffffffff814eae85>] schedule_timeout+0x215/0x2e0
 [<ffffffff814eab03>] wait_for_common+0x123/0x180
 [<ffffffff814eac1d>] wait_for_completion+0x1d/0x20
 [<ffffffffa03b398c>] srp_connect_target+0x1dc/0x410 [ib_srp]
 [<ffffffffa03b5809>] srp_create_target+0xba9/0xe70 [ib_srp]
 [<ffffffff8133e590>] dev_attr_store+0x20/0x30
 [<ffffffff811eb8f5>] sysfs_write_file+0xe5/0x170
 [<ffffffff811767c8>] vfs_write+0xb8/0x1a0
 [<ffffffff811770c1>] sys_write+0x51/0x90
 [<ffffffff8100b072>] system_call_fastpath+0x16/0x1b
v2.0.16
IB/srp: Log sgid and dgid for rejected logins