On 19/03/2019 01:45, Aditya Pakki wrote:
of_match_node can fail and return NULL in case no matching structure.
The patches checks for such a scenario and returns -ENXIO.
FWIW, it looks like most of these instances could be cleaned up even
more with of_device_get_match_data().
In general, do bear in mind that adding these NULL checks *everywhere*
will in many cases just amount to useless dead code - a pure DT-based
driver can usually freely assume of_match_node() returns non-NULL for
its own device and match table in its probe routine, because that probe
routine only ever gets called if of_driver_match_device() has already
made the same match in the first place.
Robin.
---
V1: Added files dw_mmc-zx.c and dw_mmc-rockchip.c
Signed-off-by: Aditya Pakki <pakki001@xxxxxxx>
---
drivers/mmc/host/dw_mmc-exynos.c | 2 ++
drivers/mmc/host/dw_mmc-k3.c | 2 ++
drivers/mmc/host/dw_mmc-pltfm.c | 2 ++
drivers/mmc/host/dw_mmc-rockchip.c | 2 ++
drivers/mmc/host/dw_mmc-zx.c | 2 ++
5 files changed, 10 insertions(+)
diff --git a/drivers/mmc/host/dw_mmc-exynos.c b/drivers/mmc/host/dw_mmc-exynos.c
index d46c3439b508..8a75d7314606 100644
--- a/drivers/mmc/host/dw_mmc-exynos.c
+++ b/drivers/mmc/host/dw_mmc-exynos.c
@@ -554,6 +554,8 @@ static int dw_mci_exynos_probe(struct platform_device *pdev)
int ret;
match = of_match_node(dw_mci_exynos_match, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
drv_data = match->data;
pm_runtime_get_noresume(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-k3.c b/drivers/mmc/host/dw_mmc-k3.c
index 89cdb3d533bb..cc50b7546a20 100644
--- a/drivers/mmc/host/dw_mmc-k3.c
+++ b/drivers/mmc/host/dw_mmc-k3.c
@@ -459,6 +459,8 @@ static int dw_mci_k3_probe(struct platform_device *pdev)
const struct of_device_id *match;
match = of_match_node(dw_mci_k3_match, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
drv_data = match->data;
return dw_mci_pltfm_register(pdev, drv_data);
diff --git a/drivers/mmc/host/dw_mmc-pltfm.c b/drivers/mmc/host/dw_mmc-pltfm.c
index 58c13e21bd5a..b1948989f617 100644
--- a/drivers/mmc/host/dw_mmc-pltfm.c
+++ b/drivers/mmc/host/dw_mmc-pltfm.c
@@ -82,6 +82,8 @@ static int dw_mci_pltfm_probe(struct platform_device *pdev)
if (pdev->dev.of_node) {
match = of_match_node(dw_mci_pltfm_match, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
drv_data = match->data;
}
diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
index 8c86a800a8fd..20e3471260ea 100644
--- a/drivers/mmc/host/dw_mmc-rockchip.c
+++ b/drivers/mmc/host/dw_mmc-rockchip.c
@@ -344,6 +344,8 @@ static int dw_mci_rockchip_probe(struct platform_device *pdev)
return -ENODEV;
match = of_match_node(dw_mci_rockchip_match, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
drv_data = match->data;
pm_runtime_get_noresume(&pdev->dev);
diff --git a/drivers/mmc/host/dw_mmc-zx.c b/drivers/mmc/host/dw_mmc-zx.c
index c06b5393312f..abea35431045 100644
--- a/drivers/mmc/host/dw_mmc-zx.c
+++ b/drivers/mmc/host/dw_mmc-zx.c
@@ -213,6 +213,8 @@ static int dw_mci_zx_probe(struct platform_device *pdev)
const struct of_device_id *match;
match = of_match_node(dw_mci_zx_match, pdev->dev.of_node);
+ if (!match)
+ return -ENXIO;
drv_data = match->data;
return dw_mci_pltfm_register(pdev, drv_data);
