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[SCSI] ibmvscsi: prevent scsi commands being sent in invalid state 

There is a window where we can be re-enabling an adapter, but
still allow SCSI commands to be sent to the target.  This fix
sets our window (request_limit) to -1 as soon as we know the
adapter is being reenabled, and closes a very teeny tiny
window where we could set the window back to 1 before we
grab a lock.

Signed-off-by: Dave Boutcher <sleddog@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Dave C Boutcher 2006-03-23 13:47:07 -06:00 committed by James Bottomley
parent 18c49b8cd6
commit 9b833e428a
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/ibmvscsi/ibmvscsi.c
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@ -853,14 +853,15 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
login->max_requested_initiator_to_target_iulen = sizeof(union srp_iu);
login->required_buffer_formats = 0x0006;
spin_lock_irqsave(hostdata->host->host_lock, flags);
/* Start out with a request limit of 1, since this is negotiated in
* the login request we are just sending
*/
atomic_set(&hostdata->request_limit, 1);
spin_lock_irqsave(hostdata->host->host_lock, flags);
rc = ibmvscsi_send_srp_event(evt_struct, hostdata);
spin_unlock_irqrestore(hostdata->host->host_lock, flags);
printk("ibmvscsic: sent SRP login\n");
return rc;
};
@ -1179,6 +1180,7 @@ void ibmvscsi_handle_crq(struct viosrp_crq *crq,
/* We need to re-setup the interpartition connection */
printk(KERN_INFO
"ibmvscsi: Re-enabling adapter!\n");
atomic_set(&hostdata->request_limit, -1);
purge_requests(hostdata, DID_REQUEUE);
if (ibmvscsi_reenable_crq_queue(&hostdata->queue,
hostdata) == 0)