Messages in this thread Patch in this message | | | From | Kunihiko Hayashi <> | Subject | [PATCH] PCI: endpoint: functions/pci-epf-test: Avoid DMA release when DMA is unsupported | Date | Mon, 23 Mar 2020 18:45:47 +0900 |
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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@socionext.com> --- drivers/pci/endpoint/functions/pci-epf-test.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 3b4cf7e..8b4f136 100644 --- a/drivers/pci/endpoint/functions/pci-epf-test.c +++ b/drivers/pci/endpoint/functions/pci-epf-test.c @@ -609,7 +609,8 @@ static void pci_epf_test_unbind(struct pci_epf *epf) int bar; cancel_delayed_work(&epf_test->cmd_handler); - pci_epf_test_clean_dma_chan(epf_test); + if (epf_test->dma_supported) + pci_epf_test_clean_dma_chan(epf_test); pci_epc_stop(epc); for (bar = 0; bar < PCI_STD_NUM_BARS; bar++) { epf_bar = &epf->bar[bar]; -- 2.7.4
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