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authorJosef Bacik <jbacik@fusionio.com>2012-08-01 21:36:24 +0200
committerChris Mason <chris.mason@oracle.com>2012-08-28 22:53:33 +0200
commit66657b318e0e443ada229fccd40c8be86cfebdbf (patch)
treebf1334fff93556fbc8d82b26a6d5431fd9e74b5c /net/caif
parentBtrfs: fix deadlock in wait_for_more_refs (diff)
downloadlinux-66657b318e0e443ada229fccd40c8be86cfebdbf.tar.xz
linux-66657b318e0e443ada229fccd40c8be86cfebdbf.zip
Btrfs: barrier before waitqueue_active
We need a barrir before calling waitqueue_active otherwise we will miss wakeups. So in places that do atomic_dec(); then atomic_read() use atomic_dec_return() which imply a memory barrier (see memory-barriers.txt) and then add an explicit memory barrier everywhere else that need them. Thanks, Signed-off-by: Josef Bacik <jbacik@fusionio.com>
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