Hi Lorenzo and Hou Zhiqiang
PAB_INTP_AMBA_MISC_STAT does have other status in the higher bits, it
should have been masked before checking for the status
Acked-by: Karthikeyan Mitran <m.karthikeyan@xxxxxxxxxxxxxx>
On Wed, Jun 12, 2019 at 8:38 PM Lorenzo Pieralisi
<lorenzo.pieralisi@xxxxxxx> wrote:
>
> On Fri, Apr 12, 2019 at 08:36:12AM +0000, Z.q. Hou wrote:
> > From: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> >
> > 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.
> >
> > This patch also add the clearing of the handled INTx status.
> >
> > Note: Need MV to test this fix.
>
> This means INTX were never tested and current code handling them is,
> AFAICS, an infinite loop which is very very bad.
>
> This is a gross bug and must be fixed as soon as possible.
>
> I want Karthikeyan ACK and Tested-by on this patch.
>
> Lorenzo
>
> > Fixes: 9af6bcb11e12 ("PCI: mobiveil: Add Mobiveil PCIe Host Bridge IP driver")
> > Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@xxxxxxx>
> > Reviewed-by: Minghuan Lian <Minghuan.Lian@xxxxxxx>
> > Reviewed-by: Subrahmanya Lingappa <l.subrahmanya@xxxxxxxxxxxxxx>
> > ---
> > V5:
> > - Corrected and retouched the subject and changelog.
> >
> > drivers/pci/controller/pcie-mobiveil.c | 13 +++++++++----
> > 1 file changed, 9 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-mobiveil.c b/drivers/pci/controller/pcie-mobiveil.c
> > index 4ba458474e42..78e575e71f4d 100644
> > --- a/drivers/pci/controller/pcie-mobiveil.c
> > +++ b/drivers/pci/controller/pcie-mobiveil.c
> > @@ -361,6 +361,7 @@ 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);
> > + shifted_status &= PAB_INTP_INTX_MASK;
> > shifted_status >>= PAB_INTX_START;
> > do {
> > for_each_set_bit(bit, &shifted_status, PCI_NUM_INTX) {
> > @@ -372,12 +373,16 @@ static void mobiveil_pcie_isr(struct irq_desc *desc)
> > dev_err_ratelimited(dev, "unexpected IRQ, INT%d\n",
> > bit);
> >
> > - /* clear interrupt */
> > - csr_writel(pcie,
> > - shifted_status << PAB_INTX_START,
> > + /* clear interrupt handled */
> > + csr_writel(pcie, 1 << (PAB_INTX_START + bit),
> > 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 */
> > --
> > 2.17.1
> >
--
Thanks,
Regards,
Karthikeyan Mitran
--
Mobiveil INC., CONFIDENTIALITY NOTICE: This e-mail message, including any
attachments, is for the sole use of the intended recipient(s) and may
contain proprietary confidential or privileged information or otherwise be
protected by law. Any unauthorized review, use, disclosure or distribution
is prohibited. If you are not the intended recipient, please notify the
sender and destroy all copies and the original message.
