0e86d981f9
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 trigger a NULL pointer dereference because dma_chan is not set. Avoid calling dma_release_channel() if epf_test->dma_supported is false. Link: https://lore.kernel.org/r/1587540287-10458-1-git-send-email-hayashi.kunihiko@socionext.com Fixes: 5ebf3fc59bd2 ("PCI: endpoint: functions/pci-epf-test: Add DMA support to transfer data") Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com> [lorenzo.pieralisi@arm.com: commit log] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Kishon Vijay Abraham I <kishon@ti.com>