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| author | Gavin Shan <gwshan@linux.vnet.ibm.com> | 2015-08-27 15:58:27 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-10-15 20:31:58 +1100 |
| commit | 54f9a64a36e4fc041721a954e674797c2686ea4e (patch) | |
| tree | 1e2e5df84aa1ab4282db37c4fa653fb04e506756 /arch/powerpc/kernel/eeh.c | |
| parent | 2e1a2556ebbbe7b53a05b721ac0d3d8ca9873cdb (diff) | |
| download | linux-stable-54f9a64a36e4fc041721a954e674797c2686ea4e.tar.gz linux-stable-54f9a64a36e4fc041721a954e674797c2686ea4e.tar.bz2 linux-stable-54f9a64a36e4fc041721a954e674797c2686ea4e.zip | |
powerpc/eeh: atomic_dec_if_positive() to update passthru count
No need to have two atomic opertions (update and fetch/check) when
decreasing PE's number of passed devices as one atomic operation
is enough.
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kernel/eeh.c')
| -rw-r--r-- | arch/powerpc/kernel/eeh.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 00ba5de12256..893978c980da 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -1412,8 +1412,7 @@ void eeh_dev_release(struct pci_dev *pdev) goto out; /* Decrease PE's pass through count */ - atomic_dec(&edev->pe->pass_dev_cnt); - WARN_ON(atomic_read(&edev->pe->pass_dev_cnt) < 0); + WARN_ON(atomic_dec_if_positive(&edev->pe->pass_dev_cnt) < 0); eeh_pe_change_owner(edev->pe); out: mutex_unlock(&eeh_dev_mutex); |