Re: [PATCH v2] PCI: endpoint: functions/pci-epf-test: Avoid DMA release when DMA is unsupported

[Lorenzo Pieralisi]

On Wed, Apr 22, 2020 at 04:24:47PM +0900, Kunihiko Hayashi wrote:
> When unbinding pci_epf_test, pci_epf_test_clean_dma_chan() is called in
> pci_epf_test_unbind() even though epf_test->dma_supported is false.
> As a result, dma_release_channel() will occur null pointer access because
> dma_chan isn't set.
> 
> This avoids calling dma_release_channel() if epf_test->dma_supported
> is false.
> 
> Fixes: a1d105d4ab8e ("PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data")
> Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@xxxxxxxxxxxxx>
> ---
>  drivers/pci/endpoint/functions/pci-epf-test.c | 3 +++
>  1 file changed, 3 insertions(+)

Applied (with the proper Fixes: SHA-1 ID) to pci/endpoint, thanks.

Lorenzo

> diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
> index 60330f3e..c89a956 100644
> --- a/drivers/pci/endpoint/functions/pci-epf-test.c
> +++ b/drivers/pci/endpoint/functions/pci-epf-test.c
> @@ -187,6 +187,9 @@ static int pci_epf_test_init_dma_chan(struct pci_epf_test *epf_test)
>   */
>  static void pci_epf_test_clean_dma_chan(struct pci_epf_test *epf_test)
>  {
> +	if (!epf_test->dma_supported)
> +		return;
> +
>  	dma_release_channel(epf_test->dma_chan);
>  	epf_test->dma_chan = NULL;
>  }
> -- 
> 2.7.4
>