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Message-ID: <20240913200827.546649-1-robh@kernel.org>
Date: Fri, 13 Sep 2024 15:08:26 -0500
From: "Rob Herring (Arm)" <robh@...nel.org>
To: Laxman Dewangan <ldewangan@...dia.com>,
Dmitry Torokhov <dmitry.torokhov@...il.com>,
Thierry Reding <thierry.reding@...il.com>,
Jonathan Hunter <jonathanh@...dia.com>
Cc: Thierry Reding <treding@...dia.com>,
linux-input@...r.kernel.org,
linux-tegra@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2] input: tegra: Use of_property_read_variable_u32_array() and of_property_present()
There's no need to get the length of an DT array property before
parsing the array. of_property_read_variable_u32_array() takes a
minimum and maximum length and returns the actual length (or error
code).
This is part of a larger effort to remove callers of of_get_property()
and similar functions. of_get_property() leaks the DT property data
pointer which is a problem for dynamically allocated nodes which may
be freed.
Acked-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Rob Herring (Arm) <robh@...nel.org>
---
v2:
- Fix missing Sob
---
drivers/input/keyboard/tegra-kbc.c | 72 +++++++++++-------------------
1 file changed, 27 insertions(+), 45 deletions(-)
diff --git a/drivers/input/keyboard/tegra-kbc.c b/drivers/input/keyboard/tegra-kbc.c
index 204ba189807e..6776dd94ce76 100644
--- a/drivers/input/keyboard/tegra-kbc.c
+++ b/drivers/input/keyboard/tegra-kbc.c
@@ -484,12 +484,10 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc)
struct device_node *np = kbc->dev->of_node;
u32 prop;
int i;
- u32 num_rows = 0;
- u32 num_cols = 0;
+ int num_rows;
+ int num_cols;
u32 cols_cfg[KBC_MAX_GPIO];
u32 rows_cfg[KBC_MAX_GPIO];
- int proplen;
- int ret;
if (!of_property_read_u32(np, "nvidia,debounce-delay-ms", &prop))
kbc->debounce_cnt = prop;
@@ -503,56 +501,23 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc)
of_property_read_bool(np, "nvidia,wakeup-source")) /* legacy */
kbc->wakeup = true;
- if (!of_get_property(np, "nvidia,kbc-row-pins", &proplen)) {
- dev_err(kbc->dev, "property nvidia,kbc-row-pins not found\n");
- return -ENOENT;
- }
- num_rows = proplen / sizeof(u32);
-
- if (!of_get_property(np, "nvidia,kbc-col-pins", &proplen)) {
- dev_err(kbc->dev, "property nvidia,kbc-col-pins not found\n");
- return -ENOENT;
- }
- num_cols = proplen / sizeof(u32);
-
- if (num_rows > kbc->hw_support->max_rows) {
- dev_err(kbc->dev,
- "Number of rows is more than supported by hardware\n");
- return -EINVAL;
- }
-
- if (num_cols > kbc->hw_support->max_columns) {
- dev_err(kbc->dev,
- "Number of cols is more than supported by hardware\n");
- return -EINVAL;
- }
-
- if (!of_get_property(np, "linux,keymap", &proplen)) {
+ if (!of_property_present(np, "linux,keymap")) {
dev_err(kbc->dev, "property linux,keymap not found\n");
return -ENOENT;
}
- if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) {
- dev_err(kbc->dev,
- "keypad rows/columns not properly specified\n");
- return -EINVAL;
- }
-
/* Set all pins as non-configured */
for (i = 0; i < kbc->num_rows_and_columns; i++)
kbc->pin_cfg[i].type = PIN_CFG_IGNORE;
- ret = of_property_read_u32_array(np, "nvidia,kbc-row-pins",
- rows_cfg, num_rows);
- if (ret < 0) {
+ num_rows = of_property_read_variable_u32_array(np, "nvidia,kbc-row-pins",
+ rows_cfg, 1, KBC_MAX_GPIO);
+ if (num_rows < 0) {
dev_err(kbc->dev, "Rows configurations are not proper\n");
- return -EINVAL;
- }
-
- ret = of_property_read_u32_array(np, "nvidia,kbc-col-pins",
- cols_cfg, num_cols);
- if (ret < 0) {
- dev_err(kbc->dev, "Cols configurations are not proper\n");
+ return num_rows;
+ } else if (num_rows > kbc->hw_support->max_rows) {
+ dev_err(kbc->dev,
+ "Number of rows is more than supported by hardware\n");
return -EINVAL;
}
@@ -561,11 +526,28 @@ static int tegra_kbc_parse_dt(struct tegra_kbc *kbc)
kbc->pin_cfg[rows_cfg[i]].num = i;
}
+ num_cols = of_property_read_variable_u32_array(np, "nvidia,kbc-col-pins",
+ cols_cfg, 1, KBC_MAX_GPIO);
+ if (num_cols < 0) {
+ dev_err(kbc->dev, "Cols configurations are not proper\n");
+ return num_cols;
+ } else if (num_cols > kbc->hw_support->max_columns) {
+ dev_err(kbc->dev,
+ "Number of cols is more than supported by hardware\n");
+ return -EINVAL;
+ }
+
for (i = 0; i < num_cols; i++) {
kbc->pin_cfg[cols_cfg[i]].type = PIN_CFG_COL;
kbc->pin_cfg[cols_cfg[i]].num = i;
}
+ if (!num_rows || !num_cols || ((num_rows + num_cols) > KBC_MAX_GPIO)) {
+ dev_err(kbc->dev,
+ "keypad rows/columns not properly specified\n");
+ return -EINVAL;
+ }
+
return 0;
}
--
2.45.2
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