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| author | Sebastian Ott <sebott@linux.ibm.com> | 2019-01-29 15:15:18 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2019-02-07 11:56:29 +0100 |
| commit | 614db26954ff08fa8e92b04100e31ebc04b817cf (patch) | |
| tree | b3036d1e33eb2b7559e6564f11651774fc9c7eaa /arch/s390/pci | |
| parent | s390/zcrypt: fix specification exception on z196 during ap probe (diff) | |
| download | linux-614db26954ff08fa8e92b04100e31ebc04b817cf.tar.xz linux-614db26954ff08fa8e92b04100e31ebc04b817cf.zip | |
Revert "s390/pci: remove bit_lock usage in interrupt handler"
This reverts commit 9594ca6b87d9f11e9f14ac31581e0e5d79a8e839.
With the handle_simple_irq irq_flow_handler it must be ensured to
not call generic_handle_irq with the same IRQ number on 2 CPUs at
the same time (interrupts are floating on s390).
Contrary to my initial investigation the irq_desc's lock usage in
handle_simple_irq does not ensure this. Thus re-introduce the bit-
lock usage in s390's pci handler.
Reported-by: Ursula Braun <ubraun@linux.ibm.com>
Reported-by: Alexander Schmidt <alexs@linux.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/pci')
| -rw-r--r-- | arch/s390/pci/pci.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index a966d7bfac57..4266a4de3160 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -382,7 +382,9 @@ static void zpci_irq_handler(struct airq_struct *airq) if (ai == -1UL) break; inc_irq_stat(IRQIO_MSI); + airq_iv_lock(aibv, ai); generic_handle_irq(airq_iv_get_data(aibv, ai)); + airq_iv_unlock(aibv, ai); } } } @@ -408,7 +410,7 @@ int arch_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type) zdev->aisb = aisb; /* Create adapter interrupt vector */ - zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA); + zdev->aibv = airq_iv_create(msi_vecs, AIRQ_IV_DATA | AIRQ_IV_BITLOCK); if (!zdev->aibv) return -ENOMEM; |