From 2cf5a03cb29debb00681a8af1dfa9179b43404d1 Mon Sep 17 00:00:00 2001 From: Thomas Gleixner Date: Sun, 21 Jun 2015 20:16:09 +0200 Subject: [PATCH] PCI/keystone: Fix race in installing chained IRQ handler Fix a race where a pending interrupt could be received and the handler called before the handler's data has been setup, by converting to irq_set_chained_handler_and_data(). Search and conversion was done with coccinelle: @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); | -irq_set_chained_handler(E1, E3); ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); @@ expression E1, E2, E3; @@ ( -if (irq_set_chained_handler(E1, E3) != 0) - BUG(); ... | -irq_set_chained_handler(E1, E3); ... ) -irq_set_handler_data(E1, E2); +irq_set_chained_handler_and_data(E1, E3, E2); Reported-by: Russell King Signed-off-by: Thomas Gleixner Cc: Julia Lawall Cc: Murali Karicheri Cc: Bjorn Helgaas Cc: linux-pci@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org --- drivers/pci/host/pci-keystone.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/pci/host/pci-keystone.c b/drivers/pci/host/pci-keystone.c index 75333b0c4f0a..47cf0c18d9e3 100644 --- a/drivers/pci/host/pci-keystone.c +++ b/drivers/pci/host/pci-keystone.c @@ -223,10 +223,9 @@ static void ks_pcie_setup_interrupts(struct keystone_pcie *ks_pcie) /* MSI IRQ */ if (IS_ENABLED(CONFIG_PCI_MSI)) { for (i = 0; i < ks_pcie->num_msi_host_irqs; i++) { - irq_set_chained_handler(ks_pcie->msi_host_irqs[i], - ks_pcie_msi_irq_handler); - irq_set_handler_data(ks_pcie->msi_host_irqs[i], - ks_pcie); + irq_set_chained_handler_and_data(ks_pcie->msi_host_irqs[i], + ks_pcie_msi_irq_handler, + ks_pcie); } } }