[patch] qla2xxx: locking problem in qla2x00_init_rings()

[Madhu Iyengar]

Dan,

Thanks. We'll test this patch.

Patch-reviewed-by: Giridhar Malavali <giridhar.malavali at qlogic.com>
Acked-by: Madhu Iyengar <madhu.iyengar at qlogic.com>

Cheers,
Madhu

-----Original Message-----
From: linux-scsi-owner at vger.kernel.org [mailto:linux-scsi-owner at vger.kernel.org] On Behalf Of Dan Carpenter
Sent: Sunday, September 12, 2010 2:41 PM
To: Andrew Vasquez
Cc: Linux Driver; James E.J. Bottomley; Giridhar Malavali; Lalit Chandivade; Grant Likely; linux-scsi at vger.kernel.org; devicetree-discuss at lists.ozlabs.org; kernel-janitors at vger.kernel.org; Arun Easi
Subject: [patch] qla2xxx: locking problem in qla2x00_init_rings()

IRQs are already disabled here so we don't need to disable them again.
But more importantly, the spin_lock_irqsave() overwrites "flags" and
that breaks things when we want to re-enable the IRQs when we call
spin_unlock_irqrestore(&ha->hardware_lock, flags);

Signed-off-by: Dan Carpenter <error27 at gmail.com>
---
This seems like an important bug.  I don't have this hardware but could
someone from QLogic test this out and maybe queue it up for 2.6.36?

diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index 9c383ba..9f4ba28 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -1787,14 +1787,14 @@ qla2x00_init_rings(scsi_qla_host_t *vha)
 		qla2x00_init_response_q_entries(rsp);
 	}
 
-	spin_lock_irqsave(&ha->vport_slock, flags);
+	spin_lock(&ha->vport_slock);
 	/* Clear RSCN queue. */
 	list_for_each_entry(vp, &ha->vp_list, list) {
 		vp->rscn_in_ptr = 0;
 		vp->rscn_out_ptr = 0;
 	}
 
-	spin_unlock_irqrestore(&ha->vport_slock, flags);
+	spin_unlock(&ha->vport_slock);
 
 	ha->isp_ops->config_rings(vha);
 
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