From: Pali Rohár Date: Mon, 10 Jan 2022 01:49:57 +0000 (+0100) Subject: PCI: aardvark: Fix reading MSI interrupt number X-Git-Tag: v5.10.115~2 X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e1ab92302b4460416edbe473064a3dc1b5e0ec4f;p=thirdparty%2Fkernel%2Fstable.git PCI: aardvark: Fix reading MSI interrupt number commit 805dfc18dd3d4dd97a987d4406593b5a225b1253 upstream. In advk_pcie_handle_msi() it is expected that when bit i in the W1C register PCIE_MSI_STATUS_REG is cleared, the PCIE_MSI_PAYLOAD_REG is updated to contain the MSI number corresponding to index i. Experiments show that this is not so, and instead PCIE_MSI_PAYLOAD_REG always contains the number of the last received MSI, overall. Do not read PCIE_MSI_PAYLOAD_REG register for determining MSI interrupt number. Since Aardvark already forbids more than 32 interrupts and uses own allocated hwirq numbers, the msi_idx already corresponds to the received MSI number. Link: https://lore.kernel.org/r/20220110015018.26359-3-kabel@kernel.org Fixes: 8c39d710363c ("PCI: aardvark: Add Aardvark PCI host controller driver") Signed-off-by: Pali Rohár Signed-off-by: Marek Behún Signed-off-by: Lorenzo Pieralisi Signed-off-by: Marek Behún Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/pci/controller/pci-aardvark.c b/drivers/pci/controller/pci-aardvark.c index 61c0e10908754..0c603e069f21d 100644 --- a/drivers/pci/controller/pci-aardvark.c +++ b/drivers/pci/controller/pci-aardvark.c @@ -1388,7 +1388,7 @@ static void advk_pcie_remove_irq_domain(struct advk_pcie *pcie) static void advk_pcie_handle_msi(struct advk_pcie *pcie) { u32 msi_val, msi_mask, msi_status, msi_idx; - u16 msi_data; + int virq; msi_mask = advk_readl(pcie, PCIE_MSI_MASK_REG); msi_val = advk_readl(pcie, PCIE_MSI_STATUS_REG); @@ -1398,13 +1398,9 @@ static void advk_pcie_handle_msi(struct advk_pcie *pcie) if (!(BIT(msi_idx) & msi_status)) continue; - /* - * msi_idx contains bits [4:0] of the msi_data and msi_data - * contains 16bit MSI interrupt number - */ advk_writel(pcie, BIT(msi_idx), PCIE_MSI_STATUS_REG); - msi_data = advk_readl(pcie, PCIE_MSI_PAYLOAD_REG) & PCIE_MSI_DATA_MASK; - generic_handle_irq(msi_data); + virq = irq_find_mapping(pcie->msi_inner_domain, msi_idx); + generic_handle_irq(virq); } advk_writel(pcie, PCIE_ISR0_MSI_INT_PENDING,