[PATCH] powerpc/powernv/pci: Fix typo when releasing DMA resources

[Michael Ellerman]

Frederic Barrat <fbarrat at linux.ibm.com> writes:
> Fix typo introduced during recent code cleanup, which could lead to
> silently not freeing resources or oops message (on PCI hotplug or CAPI
> reset).
> Only impacts ioda2, the code path for ioda1 is correct.
>
> Fixes: 01e12629af4e ("powerpc/powernv/pci: Add explicit tracking of the DMA setup state")
> Signed-off-by: Frederic Barrat <fbarrat at linux.ibm.com>

I changed the subject to:

    powerpc/powernv/pci: Fix possible crash when releasing DMA resources


To hopefully better convey that it's a moderately serious bug, even if
the root cause is just a typo. Otherwise folks scanning the commit log
might think it's just a harmless typo.

cheers

> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index c9c25fb0783c..023a4f987bb2 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -2705,7 +2705,7 @@ void pnv_pci_ioda2_release_pe_dma(struct pnv_ioda_pe *pe)
>  	struct iommu_table *tbl = pe->table_group.tables[0];
>  	int64_t rc;
>  
> -	if (pe->dma_setup_done)
> +	if (!pe->dma_setup_done)
>  		return;
>  
>  	rc = pnv_pci_ioda2_unset_window(&pe->table_group, 0);
> -- 
> 2.26.2