Hi Kishon,
On 2020/04/22 14:45, Kishon Vijay Abraham I wrote:
Hi Kunihiko,
On 3/23/2020 3:15 PM, 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, 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);
Can you add this check inside the pci_epf_test_clean_dma_chan()?
Okay, I'll move this check to the pci_epf_test_clean_dma_chan().
Thank you,
---
Best Regards
Kunihiko Hayashi
