From: Douglas Miller <doug.miller@xxxxxxxxxxxxxxxxxxxx>
If there is a failure during probe of hfi1 before the sdma_map_lock is
initialized, the call to hfi1_free_devdata() will attempt to use a lock
that has not been initialized. If the locking correctness validator is on
then an INFO message and stack trace resembling the following may be seen:
INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
Call Trace:
register_lock_class+0x11b/0x880
__lock_acquire+0xf3/0x7930
lock_acquire+0xff/0x2d0
_raw_spin_lock_irq+0x46/0x60
sdma_clean+0x42a/0x660 [hfi1]
hfi1_free_devdata+0x3a7/0x420 [hfi1]
init_one+0x867/0x11a0 [hfi1]
pci_device_probe+0x40e/0x8d0
The use of sdma_map_lock in sdma_clean() is for freeing the sdma_map
memory, and sdma_map is not allocated/initialized until after
sdma_map_lock has been initialized. This code only needs to be run if
sdma_map is not NULL, and so checking for that condition will avoid
trying to use the lock before it is initialized.
Fixes: 473291b3ea0e1 ("IB/hfi1: Fix for early release of sdma context")
Fixes: 7724105686e71 ("IB/hfi1: add driver files")
Reported-by: Zheyu Ma <zheyuma97@xxxxxxxxx>
Signed-off-by: Douglas Miller <doug.miller@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/hfi1/sdma.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/sdma.c b/drivers/infiniband/hw/hfi1/sdma.c
index f07d328..a95b654 100644
--- a/drivers/infiniband/hw/hfi1/sdma.c
+++ b/drivers/infiniband/hw/hfi1/sdma.c
@@ -1288,11 +1288,13 @@ void sdma_clean(struct hfi1_devdata *dd, size_t num_engines)
kvfree(sde->tx_ring);
sde->tx_ring = NULL;
}
- spin_lock_irq(&dd->sde_map_lock);
- sdma_map_free(rcu_access_pointer(dd->sdma_map));
- RCU_INIT_POINTER(dd->sdma_map, NULL);
- spin_unlock_irq(&dd->sde_map_lock);
- synchronize_rcu();
+ if (rcu_access_pointer(dd->sdma_map)) {
+ spin_lock_irq(&dd->sde_map_lock);
+ sdma_map_free(rcu_access_pointer(dd->sdma_map));
+ RCU_INIT_POINTER(dd->sdma_map, NULL);
+ spin_unlock_irq(&dd->sde_map_lock);
+ synchronize_rcu();
+ }
kfree(dd->per_sdma);
dd->per_sdma = NULL;
