[PATCHv6 27/28] PCI: mobiveil: Fix infinite-loop in the INTx process

[Hou Zhiqiang]

In the loop block, there is not code to update the loop key,
this patch updates the loop key by re-read the INTx status
register.

Note: Need MV to test this fix.

Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
Signed-off-by: Hou Zhiqiang <zhiqiang....@nxp.com>
Reviewed-by: Minghuan Lian <minghuan.l...@nxp.com>
Reviewed-by: Subrahmanya Lingappa <l.subrahma...@mobiveil.co.in>
Acked-by: Karthikeyan Mitran <m.karthike...@mobiveil.co.in>
Tested-by: Karthikeyan Mitran <m.karthike...@mobiveil.co.in>
---
V6:
 - Splited from #10 of v5 patches, no functional change.

 drivers/pci/controller/pcie-mobiveil.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/pci/controller/pcie-mobiveil.c 
b/drivers/pci/controller/pcie-mobiveil.c
index f35d14b..a5549cf 100644
--- a/drivers/pci/controller/pcie-mobiveil.c
+++ b/drivers/pci/controller/pcie-mobiveil.c
@@ -359,8 +359,9 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
 
        /* Handle INTx */
        if (intr_status & PAB_INTP_INTX_MASK) {
-               shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT) >>
-                                          PAB_INTX_START;
+               shifted_status = csr_readl(pcie, PAB_INTP_AMBA_MISC_STAT);
+               shifted_status &= PAB_INTP_INTX_MASK;
+               shifted_status >>= PAB_INTX_START;
                do {
                        for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) {
                                virq = irq_find_mapping(pcie->intx_domain,
@@ -376,7 +377,12 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
                                           shifted_status << PAB_INTX_START,
                                           PAB_INTP_AMBA_MISC_STAT);
                        }
-               } while ((shifted_status >> PAB_INTX_START) != 0);
+
+                       shifted_status = csr_readl(pcie,
+                                                  PAB_INTP_AMBA_MISC_STAT);
+                       shifted_status &= PAB_INTP_INTX_MASK;
+                       shifted_status >>= PAB_INTX_START;
+               } while (shifted_status != 0);
        }
 
        /* read extra MSI status register */
-- 
1.7.1