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| author | Jiri Kosina <jkosina@suse.cz> | 2012-10-08 09:23:54 +0200 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2012-10-09 12:27:25 +0100 |
| commit | f24b5cb818c6789e5d42d4881f34238a5fa0b40c (patch) | |
| tree | 7806309da7faaff1c867de531a07ce111df0777f /drivers/scsi | |
| parent | bc977749e967daa56de1922cf4cb38525631c51c (diff) | |
| download | blackbird-op-linux-f24b5cb818c6789e5d42d4881f34238a5fa0b40c.tar.gz blackbird-op-linux-f24b5cb818c6789e5d42d4881f34238a5fa0b40c.zip | |
[SCSI] qla2xxx: fix potential deadlock on ha->hardware_lock
Lockdep reports:
=== [ cut here ] ===
=========================================================
[ INFO: possible irq lock inversion dependency detected ]
3.6.0-0.0.0.28.36b5ec9-default #1 Not tainted
---------------------------------------------------------
qla2xxx_1_dpc/368 just changed the state of lock:
(&(&ha->vport_slock)->rlock){+.....}, at: [<ffffffffa009b377>] qla2x00_configure_hba+0x197/0x3c0 [qla2xxx]
but this lock was taken by another, HARDIRQ-safe lock in the past:
(&(&ha->hardware_lock)->rlock){-.....}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(&(&ha->vport_slock)->rlock);
local_irq_disable();
lock(&(&ha->hardware_lock)->rlock);
lock(&(&ha->vport_slock)->rlock);
<Interrupt>
lock(&(&ha->hardware_lock)->rlock);
=== [ cut here ] ===
Fix the potential deadlock by disabling IRQs while holding ha->vport_slock.
Reported-and-tested-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_init.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c index 799a58bb9859..48fca47384b7 100644 --- a/drivers/scsi/qla2xxx/qla_init.c +++ b/drivers/scsi/qla2xxx/qla_init.c @@ -2080,6 +2080,7 @@ qla2x00_configure_hba(scsi_qla_host_t *vha) uint8_t domain; char connect_type[22]; struct qla_hw_data *ha = vha->hw; + unsigned long flags; /* Get host addresses. */ rval = qla2x00_get_adapter_id(vha, @@ -2154,9 +2155,9 @@ qla2x00_configure_hba(scsi_qla_host_t *vha) vha->d_id.b.area = area; vha->d_id.b.al_pa = al_pa; - spin_lock(&ha->vport_slock); + spin_lock_irqsave(&ha->vport_slock, flags); qlt_update_vp_map(vha, SET_AL_PA); - spin_unlock(&ha->vport_slock); + spin_unlock_irqrestore(&ha->vport_slock, flags); if (!vha->flags.init_done) ql_log(ql_log_info, vha, 0x2010, |
