From: Fabien Dessenne fabien.dessenne@st.com
commit 6899b4f7c99c72968e58e502f96084f74f6e5e86 upstream
Fix null pointer issue if resource_size is called with no ioresource.
Signed-off-by: Ludovic Barre ludovic.barre@st.com Signed-off-by: Fabien Dessenne fabien.dessenne@st.com Signed-off-by: Jassi Brar jaswinder.singh@linaro.org Cc: stable stable@vger.kernel.org # 4.19+ Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org --- drivers/mailbox/mailbox-test.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-)
diff --git a/drivers/mailbox/mailbox-test.c b/drivers/mailbox/mailbox-test.c index 58bfafc34bc4..129b3656c453 100644 --- a/drivers/mailbox/mailbox-test.c +++ b/drivers/mailbox/mailbox-test.c @@ -363,22 +363,24 @@ static int mbox_test_probe(struct platform_device *pdev)
/* It's okay for MMIO to be NULL */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); - size = resource_size(res); tdev->tx_mmio = devm_ioremap_resource(&pdev->dev, res); - if (PTR_ERR(tdev->tx_mmio) == -EBUSY) + if (PTR_ERR(tdev->tx_mmio) == -EBUSY) { /* if reserved area in SRAM, try just ioremap */ + size = resource_size(res); tdev->tx_mmio = devm_ioremap(&pdev->dev, res->start, size); - else if (IS_ERR(tdev->tx_mmio)) + } else if (IS_ERR(tdev->tx_mmio)) { tdev->tx_mmio = NULL; + }
/* If specified, second reg entry is Rx MMIO */ res = platform_get_resource(pdev, IORESOURCE_MEM, 1); - size = resource_size(res); tdev->rx_mmio = devm_ioremap_resource(&pdev->dev, res); - if (PTR_ERR(tdev->rx_mmio) == -EBUSY) + if (PTR_ERR(tdev->rx_mmio) == -EBUSY) { + size = resource_size(res); tdev->rx_mmio = devm_ioremap(&pdev->dev, res->start, size); - else if (IS_ERR(tdev->rx_mmio)) + } else if (IS_ERR(tdev->rx_mmio)) { tdev->rx_mmio = tdev->tx_mmio; + }
tdev->tx_channel = mbox_test_request_channel(pdev, "tx"); tdev->rx_channel = mbox_test_request_channel(pdev, "rx");