xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

IB/IPoIB: Disable bottom half when dealing with device address

Browse Source 
Align locking usage when touching device address with rest
of the kernel. Lock the bottom half when doing so using
netif_addr_lock_bh.

This also solves the following case as reported by lockdep:
	CPU0                    CPU1
	----                    ----
lock(_xmit_INFINIBAND);
				local_irq_disable();
				lock(&(&mc->mca_lock)->rlock);
				lock(_xmit_INFINIBAND);
<Interrupt>
lock(&(&mc->mca_lock)->rlock);

*** DEADLOCK ***

Fixes: 492a7e67ff ("IB/IPoIB: Allow setting the device address")
Signed-off-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Mark Bloch
2016-06-04 15:15:22 +03:00
committed by Doug Ledford
parent 8e787646fb
commit 9b29953bf8
3 changed files with 11 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/infiniband/ulp/ipoib/ipoib_multicast.c
View File

@@ -582,13 +582,13 @@ void ipoib_mcast_join_task(struct work_struct *work)
return;
}
priv->local_lid = port_attr.lid;
netif_addr_lock(dev);
netif_addr_lock_bh(dev);
if (!test_bit(IPOIB_FLAG_DEV_ADDR_SET, &priv->flags)) {
netif_addr_unlock(dev);
netif_addr_unlock_bh(dev);
return;
}
netif_addr_unlock(dev);
netif_addr_unlock_bh(dev);
spin_lock_irq(&priv->lock);
if (!test_bit(IPOIB_FLAG_OPER_UP, &priv->flags))