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[PATCH] fix megaraid.c locking 

This fixes locking in megaraid.c, namely:

 (1) make sure megaraid_queue release the adapter lock by changing the
     code to have a single return
 (2) remove the errornous scsi_assign_lock call

Testing by Burton Windle.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Burton Windle <bwindle@fint.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christoph Hellwig 2005-11-29 21:36:16 +01:00 committed by Linus Torvalds
parent 238f58d898
commit 238f9b063d
1 changed files with 14 additions and 15 deletions
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29
drivers/scsi/megaraid.c
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@ -380,23 +380,23 @@ megaraid_queue(Scsi_Cmnd *scmd, void (*done)(Scsi_Cmnd *))
spin_lock_irqsave(&adapter->lock, flags);
scb = mega_build_cmd(adapter, scmd, &busy);
if (!scb)
goto out;
if(scb) {
scb->state |= SCB_PENDQ;
list_add_tail(&scb->list, &adapter->pending_list);
scb->state |= SCB_PENDQ;
list_add_tail(&scb->list, &adapter->pending_list);
/*
* Check if the HBA is in quiescent state, e.g., during a
* delete logical drive opertion. If it is, don't run
* the pending_list.
*/
if(atomic_read(&adapter->quiescent) == 0) {
mega_runpendq(adapter);
}
return 0;
}
/*
* Check if the HBA is in quiescent state, e.g., during a
* delete logical drive opertion. If it is, don't run
* the pending_list.
*/
if (atomic_read(&adapter->quiescent) == 0)
mega_runpendq(adapter);
busy = 0;
out:
spin_unlock_irqrestore(&adapter->lock, flags);
return busy;
}
@ -4677,7 +4677,6 @@ megaraid_probe_one(struct pci_dev *pdev, const struct pci_device_id *id)
adapter->flag = flag;
spin_lock_init(&adapter->lock);
scsi_assign_lock(host, &adapter->lock);
host->cmd_per_lun = max_cmd_per_lun;
host->max_sectors = max_sectors_per_io;