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| author |   Marc Zyngier <marc.zyngier@arm.com> | 2018-11-13 22:57:33 +0000 |
|---|---|---|
| committer |   Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2018-12-11 10:37:40 +0000 |
| commit | fce5423e4f431c71933d6c1f850b540a314aa6ee (patch) | |
| tree | 7160f9bfe1bc66865691a0939578984c6d567976 /drivers/pci/controller/dwc/pcie-designware-host.c | |
| parent | PCI: dwc: Use interrupt masking instead of disabling (diff) | |
| download | linux-dev-fce5423e4f431c71933d6c1f850b540a314aa6ee.tar.xz linux-dev-fce5423e4f431c71933d6c1f850b540a314aa6ee.zip | |
PCI: dwc: Take lock when ACKing an interrupt
Bizarrely, there is no lock taken in the irq_ack() helper. This
puts the ACK callback provided by a specific platform in a awkward
situation where there is no synchronization that would be expected
on other callback.
Introduce the required lock, giving some level of uniformity among
callbacks.
Fixes: 7c5925afbc58 ("PCI: dwc: Move MSI IRQs allocation to IRQ domains
hierarchical API")
Link: https://lore.kernel.org/linux-pci/20181113225734.8026-1-marc.zyngier@arm.com/
Tested-by: Niklas Cassel <niklas.cassel@linaro.org>
Tested-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Tested-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-designware-host.c')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware-host.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 0f81b7169147..610a5e018d27 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -202,11 +202,16 @@ static void dw_pci_bottom_ack(struct irq_data *d) { struct msi_desc *msi = irq_data_get_msi_desc(d); struct pcie_port *pp; + unsigned long flags; pp = msi_desc_to_pci_sysdata(msi); + raw_spin_lock_irqsave(&pp->lock, flags); + if (pp->ops->msi_irq_ack) pp->ops->msi_irq_ack(d->hwirq, pp); + + raw_spin_unlock_irqrestore(&pp->lock, flags); } static struct irq_chip dw_pci_msi_bottom_irq_chip = { |