let LLD handle bsg_job_timeout

The current fc_bsg_job_timeout function offers
only two possibilities to a LLD to deal with timed out requests. Either you deal with it offering a callback or not,
in both scenarios the environment is cleaned up afterwards.

Unfortunately we (zfcp) don't have the option
to easily abort a request. Our hardware is running its
own timer taking care of requests but unfortunately our only chance is to wait until we receive a response. Up until then we need the environment because the hardware might write into the provided buffers.

The following code snippet would solve the issue for us but maybe someone has a better idea on how to deal with the described situation.

Cheers Swen

---
 drivers/scsi/scsi_transport_fc.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

Index: HEAD/drivers/scsi/scsi_transport_fc.c
===================================================================

drivers/scsi/scsi_transport_fc.c +4 -2

@@ -3500,7 +3500,10 @@ fc_bsg_job_timeout(struct request *req)
 	if (!done && i->f->bsg_timeout) {
 		/* call LLDD to abort the i/o as it has timed out */
 		err = i->f->bsg_timeout(job);
-		if (err)
+		if (err == -EAGAIN) {
+			job->ref_cnt--;
+			return BLK_EH_RESET_TIMER;
+		} else if (err)
 			printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
 				"abort failed with status %d\n", err);
 	}
 
 
 
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