[PATCH] PCI: endpoint: IS_ERR() vs NULL bug in pci_epf_test_init_dma_chan()

[Dan Carpenter <dan.carpenter@oracle.com>]

The dma_request_channel() function doesn't return error pointers, it
returns NULL.

Fixes: fff86dfbbf82 ("PCI: endpoint: Enable DMA tests for endpoints with DMA capabilities")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
---
It's surprising and unfortunate that dma_request_channel() returns NULL
while dma_request_chan_by_mask() returns error pointers.  These days
static checkers will catch this so it's not as bad as it could be but
still not ideal.

 drivers/pci/endpoint/functions/pci-epf-test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c
index 34aac220dd4c..eed6638ab71d 100644
--- a/drivers/pci/endpoint/functions/pci-epf-test.c
+++ b/drivers/pci/endpoint/functions/pci-epf-test.c
@@ -221,7 +221,7 @@ static int pci_epf_test_init_dma_chan(struct pci_epf_test *epf_test)
 	filter.dma_mask = BIT(DMA_MEM_TO_DEV);
 	dma_chan = dma_request_channel(mask, epf_dma_filter_fn, &filter);
 
-	if (IS_ERR(dma_chan)) {
+	if (!dma_chan) {
 		dev_info(dev, "Failed to get private DMA tx channel. Falling back to generic one\n");
 		goto fail_back_rx;
 	}
-- 
2.35.1