On Wednesday, October 09, 2013 6:48 PM, Kishon Vijay Abraham I wrote:
> On Wednesday 09 October 2013 02:47 PM, Jingoo Han wrote:
> > On Wednesday, October 09, 2013 6:06 PM, Kishon Vijay Abraham I wrote:
> >> On Wednesday 09 October 2013 01:39 PM, Jingoo Han wrote:
> >>> Without irq_create_mapping(), the correct irq number cannot be
> >>> provided. In this case, it makes problem such as NULL deference.
> >>> Thus, irq_create_mapping() should be added for MSI.
> >>>
> >>> Signed-off-by: Jingoo Han <jg1.han@xxxxxxxxxxx>
> >>> Cc: Kishon Vijay Abraham I <kishon@xxxxxx>
> >>> ---
> >>> Tested on Exynos5440.
> >>>
> >>> drivers/pci/host/pcie-designware.c | 10 ++++------
> >>> drivers/pci/host/pcie-designware.h | 1 +
> >>> 2 files changed, 5 insertions(+), 6 deletions(-)
> >>>
> >>> diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
> >>> index 8963017..e536bb6 100644
> >>> --- a/drivers/pci/host/pcie-designware.c
> >>> +++ b/drivers/pci/host/pcie-designware.c
> >>> @@ -237,6 +237,8 @@ static int assign_irq(int no_irqs, struct msi_desc *desc, int *pos)
> >>> }
> >>> }
> >>>
> >>> + pp->msi_irq_start = irq_create_mapping(pp->irq_domain, 0);
> >>> +
> >>
> >> I think irq_create_mapping should be done for all the MSI irq lines instead of
> >> only the first line. So you might have to do for MAX_MSI_IRQS lines.
>
> Maybe it should be only till MAX_MSI_IRQS-1?
I am not sure; however, it doesn't look correct.
irq_create_mapping() is defined as below.
According to the comment, irq_create_mapping() maps 'a' hardware interrupt,
not max value of MSI IRQ lines.
./kernel/irq/irqdomain.c
/**
* irq_create_mapping() - Map a hardware interrupt into linux irq space
* @domain: domain owning this hardware interrupt or NULL for default domain
* @hwirq: hardware irq number in that domain space
[.....]
unsigned int irq_create_mapping(struct irq_domain *domain,
irq_hw_number_t hwirq)
Also, another value of 'irq' can be selected, because 'pos0' is added.
pp->msi_irq_start = irq_create_mapping(pp->irq_domain, 0);
irq = (pp->msi_irq_start + pos0);
Pratyush Anand,
If I am wrong, please let me know. :-)
Best regards,
Jingoo Han
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