Messages in this thread Patch in this message | | | From | Andreas Larsson <> | Subject | [PATCH v2 2/6] of: Return -ENXIO from of_parse_phandle_with_args for too large index and return errors from of_gpio_named_count | Date | Tue, 29 Jan 2013 15:53:39 +0100 |
| |
This lets of_gpio_named_count return an errno on errors by being able to distinguish between reaching the end of the phandle list and getting some other error from of_parse_phandle_with_args.
Return error from of_spi_register_master when there is an "cs-gpios" list for which gp_gpio_named_count fails.
Adjust various drivers cope with error return from of_gpio_named_count, including via of_gpio_count.
Signed-off-by: Andreas Larsson <andreas@gaisler.com> --- Changes since v1: - Handle error return values from calls to of_gpio_count
drivers/gpio/gpiolib-of.c | 8 +++++--- drivers/hwmon/gpio-fan.c | 6 +++--- drivers/i2c/muxes/i2c-mux-gpio.c | 3 ++- drivers/input/keyboard/matrix_keypad.c | 2 +- drivers/net/phy/mdio-mux-gpio.c | 2 +- drivers/of/base.c | 5 ++++- drivers/spi/spi-fsl-spi.c | 4 +++- drivers/spi/spi-mpc52xx.c | 5 +++++ drivers/spi/spi-oc-tiny.c | 4 +++- drivers/spi/spi-ppc4xx.c | 6 +++++- drivers/spi/spi.c | 11 +++++++---- 11 files changed, 39 insertions(+), 17 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c index d542a14..28f24a6 100644 --- a/drivers/gpio/gpiolib-of.c +++ b/drivers/gpio/gpiolib-of.c @@ -107,11 +107,10 @@ EXPORT_SYMBOL(of_get_named_gpio_flags); */ unsigned int of_gpio_named_count(struct device_node *np, const char* propname) { + int ret; unsigned int cnt = 0; do { - int ret; - ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", cnt, NULL); /* A hole in the gpios = <> counts anyway. */ @@ -119,7 +118,10 @@ unsigned int of_gpio_named_count(struct device_node *np, const char* propname) break; } while (++cnt); - return cnt; + if (ret == -ENXIO) + return cnt; + else + return ret; } EXPORT_SYMBOL(of_gpio_named_count); diff --git a/drivers/hwmon/gpio-fan.c b/drivers/hwmon/gpio-fan.c index 4e04c12..9b92d34 100644 --- a/drivers/hwmon/gpio-fan.c +++ b/drivers/hwmon/gpio-fan.c @@ -422,8 +422,8 @@ static int gpio_fan_get_of_pdata(struct device *dev, /* Fill GPIO pin array */ pdata->num_ctrl = of_gpio_count(node); - if (!pdata->num_ctrl) { - dev_err(dev, "gpios DT property empty / missing"); + if (pdata->num_ctrl <= 0) { + dev_err(dev, "gpios DT property broken / empty / missing"); return -ENODEV; } ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned), @@ -477,7 +477,7 @@ static int gpio_fan_get_of_pdata(struct device *dev, pdata->speed = speed; /* Alarm GPIO if one exists */ - if (of_gpio_named_count(node, "alarm-gpios")) { + if (of_gpio_named_count(node, "alarm-gpios") > 0) { struct gpio_fan_alarm *alarm; int val; enum of_gpio_flags flags; diff --git a/drivers/i2c/muxes/i2c-mux-gpio.c b/drivers/i2c/muxes/i2c-mux-gpio.c index 9272743..a3ddb36 100644 --- a/drivers/i2c/muxes/i2c-mux-gpio.c +++ b/drivers/i2c/muxes/i2c-mux-gpio.c @@ -106,7 +106,8 @@ static int i2c_mux_gpio_probe_dt(struct gpiomux *mux, mux->data.n_gpios = of_gpio_named_count(np, "mux-gpios"); if (mux->data.n_gpios < 0) { - dev_err(&pdev->dev, "Missing mux-gpios property in the DT.\n"); + dev_err(&pdev->dev, + "Missing or broken mux-gpios property in the DT.\n"); return -EINVAL; } diff --git a/drivers/input/keyboard/matrix_keypad.c b/drivers/input/keyboard/matrix_keypad.c index f4ff0dd..bc7cec5 100644 --- a/drivers/input/keyboard/matrix_keypad.c +++ b/drivers/input/keyboard/matrix_keypad.c @@ -418,7 +418,7 @@ matrix_keypad_parse_dt(struct device *dev) pdata->num_row_gpios = of_gpio_named_count(np, "row-gpios"); pdata->num_col_gpios = of_gpio_named_count(np, "col-gpios"); - if (!pdata->num_row_gpios || !pdata->num_col_gpios) { + if (pdata->num_row_gpios <= 0 || !pdata->num_col_gpios <= 0) { dev_err(dev, "number of keypad rows/columns not specified\n"); return ERR_PTR(-EINVAL); } diff --git a/drivers/net/phy/mdio-mux-gpio.c b/drivers/net/phy/mdio-mux-gpio.c index 0c9accb..3e1d285 100644 --- a/drivers/net/phy/mdio-mux-gpio.c +++ b/drivers/net/phy/mdio-mux-gpio.c @@ -61,7 +61,7 @@ static int mdio_mux_gpio_probe(struct platform_device *pdev) return -ENODEV; num_gpios = of_gpio_count(pdev->dev.of_node); - if (num_gpios == 0 || num_gpios > MDIO_MUX_GPIO_MAX_BITS) + if (num_gpios <= 0 || num_gpios > MDIO_MUX_GPIO_MAX_BITS) return -ENODEV; s = devm_kzalloc(&pdev->dev, sizeof(*s), GFP_KERNEL); diff --git a/drivers/of/base.c b/drivers/of/base.c index 986afd7..1f16629 100644 --- a/drivers/of/base.c +++ b/drivers/of/base.c @@ -1110,7 +1110,10 @@ int of_parse_phandle_with_args(const struct device_node *np, const char *list_na /* Loop exited without finding a valid entry; return an error */ if (node) of_node_put(node); - return -EINVAL; + if (list == list_end) + return -ENXIO; /* Index beyond end of list */ + else + return -EINVAL; } EXPORT_SYMBOL(of_parse_phandle_with_args); diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c index 1a7f635..9dcfeed 100644 --- a/drivers/spi/spi-fsl-spi.c +++ b/drivers/spi/spi-fsl-spi.c @@ -952,13 +952,15 @@ static int of_fsl_spi_get_chipselects(struct device *dev) int ret; ngpios = of_gpio_count(np); - if (!ngpios) { + if (!ngpios || ngpios == -ENOENT) { /* * SPI w/o chip-select line. One SPI device is still permitted * though. */ pdata->max_chipselect = 1; return 0; + } else if (ngpios < 0) { + return ngpios; } pinfo->gpios = kmalloc(ngpios * sizeof(*pinfo->gpios), GFP_KERNEL); diff --git a/drivers/spi/spi-mpc52xx.c b/drivers/spi/spi-mpc52xx.c index 29f7705..e945195 100644 --- a/drivers/spi/spi-mpc52xx.c +++ b/drivers/spi/spi-mpc52xx.c @@ -478,6 +478,11 @@ static int mpc52xx_spi_probe(struct platform_device *op) gpio_direction_output(gpio_cs, 1); ms->gpio_cs[i] = gpio_cs; } + } else if (ms->gpio_cs_count < 0 && ms->gpio_cs_count != -ENOENT) { + dev_err(&op->dev, + "could not count the gpio field entries in oftree\n"); + rc = ms->gpio_cs_count; + goto err_alloc_gpio; } spin_lock_init(&ms->lock); diff --git a/drivers/spi/spi-oc-tiny.c b/drivers/spi/spi-oc-tiny.c index 432e66e..d1a7151 100644 --- a/drivers/spi/spi-oc-tiny.c +++ b/drivers/spi/spi-oc-tiny.c @@ -254,12 +254,14 @@ static int tiny_spi_of_probe(struct platform_device *pdev) if (!np) return 0; hw->gpio_cs_count = of_gpio_count(np); - if (hw->gpio_cs_count) { + if (hw->gpio_cs_count > 0) { hw->gpio_cs = devm_kzalloc(&pdev->dev, hw->gpio_cs_count * sizeof(unsigned int), GFP_KERNEL); if (!hw->gpio_cs) return -ENOMEM; + } else if (hw->gpio_cs_count < 0 && hw->gpio_cs_count != -ENOENT) { + return hw->gpio_cs_count; } for (i = 0; i < hw->gpio_cs_count; i++) { hw->gpio_cs[i] = of_get_gpio_flags(np, i, NULL); diff --git a/drivers/spi/spi-ppc4xx.c b/drivers/spi/spi-ppc4xx.c index 7a85f22..b5243c5 100644 --- a/drivers/spi/spi-ppc4xx.c +++ b/drivers/spi/spi-ppc4xx.c @@ -419,7 +419,7 @@ static int __init spi_ppc4xx_of_probe(struct platform_device *op) * This includes both "null" gpio's and real ones. */ num_gpios = of_gpio_count(np); - if (num_gpios) { + if (num_gpios > 0) { int i; hw->gpios = kzalloc(sizeof(int) * num_gpios, GFP_KERNEL); @@ -454,6 +454,10 @@ static int __init spi_ppc4xx_of_probe(struct platform_device *op) goto free_gpios; } } + } else if (num_gpios < 0 && num_gpios != -ENOENT) { + dev_err(dev, "could not count gpio field entries\n"); + ret = num_gpios; + goto free_master; } /* Setup the state for the bitbang driver */ diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 19ee901..9c2acf1 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1059,7 +1059,7 @@ EXPORT_SYMBOL_GPL(spi_alloc_master); #ifdef CONFIG_OF static int of_spi_register_master(struct spi_master *master) { - u16 nb; + int nb; int i, *cs; struct device_node *np = master->dev.of_node; @@ -1067,10 +1067,13 @@ static int of_spi_register_master(struct spi_master *master) return 0; nb = of_gpio_named_count(np, "cs-gpios"); - master->num_chipselect = max(nb, master->num_chipselect); - - if (nb < 1) + if (nb == 0 || nb == -ENOENT) /* No error if cs-gpios does not exist */ return 0; + else if (nb < 0) + return nb; + + if (nb > master->num_chipselect) + master->num_chipselect = (u16)nb; cs = devm_kzalloc(&master->dev, sizeof(int) * master->num_chipselect, -- 1.7.0.4
| |