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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 <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Julia Lawall <Julia.Lawall@lip6.fr>
Cc: Murali Karicheri <m-karicheri2@ti.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: linux-pci@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
hifive-unleashed-5.1
Thomas Gleixner 2015-06-21 20:16:09 +02:00
parent c30e30478c
commit 2cf5a03cb2
1 changed files with 3 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/pci/host/pci-keystone.c
View File

@ -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);
}
}
}