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| author | Jakub Kicinski <kuba@kernel.org> | 2024-09-05 20:27:09 -0700 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-09-12 17:11:24 -0700 |
| commit | 46ae4d0a489741565520195bddebc3414781e603 (patch) | |
| tree | b364bb2c6808d4d1ae4e00c46c123caf7fffe618 /arch/powerpc/lib/qspinlock.c | |
| parent | 3cfb5aa10cb78571e214e48a3a6e42c11d5288a1 (diff) | |
| parent | 5abfdfd402699ce7c1e81d1a25bc37f60f7741ff (diff) | |
| download | linux-46ae4d0a489741565520195bddebc3414781e603.tar.gz linux-46ae4d0a489741565520195bddebc3414781e603.tar.bz2 linux-46ae4d0a489741565520195bddebc3414781e603.zip | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Cross-merge networking fixes after downstream PR.
No conflicts (sort of) and no adjacent changes.
This merge reverts commit b3c9e65eb227 ("net: hsr: remove seqnr_lock")
from net, as it was superseded by
commit 430d67bdcb04 ("net: hsr: Use the seqnr lock for frames received via interlink port.")
in net-next.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'arch/powerpc/lib/qspinlock.c')
| -rw-r--r-- | arch/powerpc/lib/qspinlock.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/powerpc/lib/qspinlock.c b/arch/powerpc/lib/qspinlock.c index 5de4dd549f6e..bcc7e4dff8c3 100644 --- a/arch/powerpc/lib/qspinlock.c +++ b/arch/powerpc/lib/qspinlock.c @@ -697,7 +697,15 @@ again: } release: - qnodesp->count--; /* release the node */ + /* + * Clear the lock before releasing the node, as another CPU might see stale + * values if an interrupt occurs after we increment qnodesp->count + * but before node->lock is initialized. The barrier ensures that + * there are no further stores to the node after it has been released. + */ + node->lock = NULL; + barrier(); + qnodesp->count--; } void queued_spin_lock_slowpath(struct qspinlock *lock) |