[PATCH v2] PCI: xilinx: Fix INTx IRQ domain leak when MSI allocation fails

[Haotian Zhang <vulab@iscas.ac.cn>]

In xilinx_pcie_init_irq_domain(), if xilinx_allocate_msi_domains()
fails after pcie->leg_domain has been successfully created via
irq_domain_create_linear(), the function returns directly without
cleaning up the allocated IRQ domain, resulting in a resource leak.

Add irq_domain_remove() call in the error path to properly release the
IRQ domain before returning the error.

Fixes: 313b64c3ae52 ("PCI: xilinx: Convert to MSI domains")
Suggested-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Haotian Zhang <vulab@iscas.ac.cn>
---
Changes in v2:
  - Correct the Fixes tag to point to the commit that introduced the
    legacy IRQ domain leak on MSI allocation failure.
---
 drivers/pci/controller/pcie-xilinx.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-xilinx.c b/drivers/pci/controller/pcie-xilinx.c
index 937ea6ae1ac4..e8cf320f3764 100644
--- a/drivers/pci/controller/pcie-xilinx.c
+++ b/drivers/pci/controller/pcie-xilinx.c
@@ -480,8 +480,10 @@ static int xilinx_pcie_init_irq_domain(struct xilinx_pcie *pcie)
 		phys_addr_t pa = ALIGN_DOWN(virt_to_phys(pcie), SZ_4K);
 
 		ret = xilinx_allocate_msi_domains(pcie);
-		if (ret)
+		if (ret) {
+			irq_domain_remove(pcie->leg_domain);
 			return ret;
+		}
 
 		pcie_write(pcie, upper_32_bits(pa), XILINX_PCIE_REG_MSIBASE1);
 		pcie_write(pcie, lower_32_bits(pa), XILINX_PCIE_REG_MSIBASE2);
-- 
2.50.1.windows.1