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authorJiri Kosina <jkosina@suse.cz>2012-10-08 09:23:54 +0200
committerJames Bottomley <JBottomley@Parallels.com>2012-10-09 13:27:25 +0200
commitf24b5cb818c6789e5d42d4881f34238a5fa0b40c (patch)
tree7806309da7faaff1c867de531a07ce111df0777f /drivers/scsi/qla2xxx/qla_init.c
parent[SCSI] scsi_debug: Fix off-by-one bug when unmapping region (diff)
downloadlinux-f24b5cb818c6789e5d42d4881f34238a5fa0b40c.tar.xz
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/qla2xxx/qla_init.c')
-rw-r--r--drivers/scsi/qla2xxx/qla_init.c5
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,