6.6-stable review patch. If anyone has any objections, please let me know.
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From: Niklas Cassel cassel@kernel.org
[ Upstream commit 09fefb24ed5e15f3b112f6c04b21a90ea23eaf8b ]
dw_pcie_edma_irq_verify() is supposed to verify the eDMA IRQs in devicetree by fetching them using either 'dma' or 'dmaX' IRQ names. Former is used when the platform uses a single IRQ for all eDMA channels and latter is used when the platform uses separate IRQ per channel. But currently, dw_pcie_edma_irq_verify() bails out early if edma::nr_irqs is 1, i.e., when a single IRQ is used. This gives an impression that the driver could work with any single IRQ in devicetree, not necessarily with name 'dma'.
But dw_pcie_edma_irq_vector(), which actually requests the IRQ, does require the single IRQ to be named as 'dma'. So this creates inconsistency between dw_pcie_edma_irq_verify() and dw_pcie_edma_irq_vector().
Thus, to fix this inconsistency, make sure dw_pcie_edma_irq_verify() also verifies the single IRQ name by removing the bail out code.
Signed-off-by: Niklas Cassel cassel@kernel.org [mani: reworded subject and description] Signed-off-by: Manivannan Sadhasivam mani@kernel.org [bhelgaas: fix typos] Signed-off-by: Bjorn Helgaas bhelgaas@google.com Link: https://patch.msgid.link/20250908165914.547002-3-cassel@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/pci/controller/dwc/pcie-designware.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c index 717af1b757f0a..46b12e157bebe 100644 --- a/drivers/pci/controller/dwc/pcie-designware.c +++ b/drivers/pci/controller/dwc/pcie-designware.c @@ -927,9 +927,7 @@ static int dw_pcie_edma_irq_verify(struct dw_pcie *pci) char name[6]; int ret;
- if (pci->edma.nr_irqs == 1) - return 0; - else if (pci->edma.nr_irqs > 1) + if (pci->edma.nr_irqs > 1) return pci->edma.nr_irqs != ch_cnt ? -EINVAL : 0;
ret = platform_get_irq_byname_optional(pdev, "dma");