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| author | Martin Kaiser <martin@kaiser.cx> | 2021-01-15 22:24:35 +0100 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2021-01-18 15:48:06 +0000 |
| commit | a93c00e5f975f23592895b7e83f35de2d36b7633 (patch) | |
| tree | cf0f74a083575e486e5e54ef0f3a7529eb9a8c20 /drivers/pci | |
| parent | ad1cc6b75a79471d14b64c32bf13067659ba2bac (diff) | |
| download | linux-stable-a93c00e5f975f23592895b7e83f35de2d36b7633.tar.gz linux-stable-a93c00e5f975f23592895b7e83f35de2d36b7633.tar.bz2 linux-stable-a93c00e5f975f23592895b7e83f35de2d36b7633.zip | |
PCI: xgene-msi: 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().
See also 2cf5a03cb29d ("PCI/keystone: Fix race in installing chained IRQ
handler").
Based on the mail discussion, it seems ok to drop the error handling.
Link: https://lore.kernel.org/r/20210115212435.19940-3-martin@kaiser.cx
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/controller/pci-xgene-msi.c | 10 |
1 files changed, 3 insertions, 7 deletions
diff --git a/drivers/pci/controller/pci-xgene-msi.c b/drivers/pci/controller/pci-xgene-msi.c index 2470782cb01a..1c34c897a7e2 100644 --- a/drivers/pci/controller/pci-xgene-msi.c +++ b/drivers/pci/controller/pci-xgene-msi.c @@ -384,13 +384,9 @@ static int xgene_msi_hwirq_alloc(unsigned int cpu) if (!msi_group->gic_irq) continue; - irq_set_chained_handler(msi_group->gic_irq, - xgene_msi_isr); - err = irq_set_handler_data(msi_group->gic_irq, msi_group); - if (err) { - pr_err("failed to register GIC IRQ handler\n"); - return -EINVAL; - } + irq_set_chained_handler_and_data(msi_group->gic_irq, + xgene_msi_isr, msi_group); + /* * Statically allocate MSI GIC IRQs to each CPU core. * With 8-core X-Gene v1, 2 MSI GIC IRQs are allocated |