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PCI: dwc: Clear MSI interrupt status after it is handled, not before 

If the interrupt status is cleared before it is handled, it is possible
that another interrupt will trigger while servicing the previous one.  This
is causing timeouts in some wireless lan cards which use PCIe.

Clear MSI interrupt status after it gets serviced instead of before calling
generic_handler.

Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-By: Joao Pinto <jpinto@synopsys.com>
This commit is contained in:
Faiz Abbas 2017-08-10 16:54:55 +05:30 committed by Bjorn Helgaas
parent 71cee8e190
commit 8c934095fa
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/dwc/pcie-designware-host.c
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@ -71,9 +71,9 @@ irqreturn_t dw_handle_msi_irq(struct pcie_port *pp)
while ((pos = find_next_bit((unsigned long *) &val, 32,
pos)) != 32) {
irq = irq_find_mapping(pp->irq_domain, i * 32 + pos);
generic_handle_irq(irq);
dw_pcie_wr_own_conf(pp, PCIE_MSI_INTR0_STATUS + i * 12,
4, 1 << pos);
generic_handle_irq(irq);
pos++;
}
}