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| author | Kunihiko Hayashi <hayashi.kunihiko@socionext.com> | 2020-04-22 10:24:47 +0300 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2020-05-05 14:23:07 +0300 |
| commit | 0e86d981f9b7252e9716c5137cd8e4d9ad8ef32f (patch) | |
| tree | d56c72b3439bf828306e86bfa3c4db249626ffc9 /drivers/pci/endpoint/functions | |
| parent | 8f3d9f354286745c751374f5f1fcafee6b3f3136 (diff) | |
| download | linux-0e86d981f9b7252e9716c5137cd8e4d9ad8ef32f.tar.xz | |
PCI: endpoint: functions/pci-epf-test: Fix DMA channel release
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>
Diffstat (limited to 'drivers/pci/endpoint/functions')
| -rw-r--r-- | drivers/pci/endpoint/functions/pci-epf-test.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/endpoint/functions/pci-epf-test.c b/drivers/pci/endpoint/functions/pci-epf-test.c index 60330f3e3751..c89a9561439f 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; } |