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at86rf230: copy pdata to driver allocated space

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This patch copies the platform data in driver allocated space at first.
With this change we ensure that we access the allocated platform data as
readonly space.

Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Reported-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Alexander Aring 2015-02-27 09:58:25 +01:00 committed by Marcel Holtmann
parent 9391976a4d
commit aaa1c4d226
1 changed files with 25 additions and 26 deletions
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51
drivers/net/ieee802154/at86rf230.c
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@ -1377,24 +1377,24 @@ static int at86rf230_hw_init(struct at86rf230_local *lp)
return at86rf230_write_subreg(lp, SR_SLOTTED_OPERATION, 0);
}
static struct at86rf230_platform_data *
at86rf230_get_pdata(struct spi_device *spi)
static int
at86rf230_get_pdata(struct spi_device *spi, int *rstn, int *slp_tr)
{
struct at86rf230_platform_data *pdata;
struct at86rf230_platform_data *pdata = spi->dev.platform_data;
if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node)
return spi->dev.platform_data;
pdata = devm_kzalloc(&spi->dev, sizeof(*pdata), GFP_KERNEL);
if (!IS_ENABLED(CONFIG_OF) || !spi->dev.of_node) {
if (!pdata)
goto done;
return -ENOENT;
pdata->rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
pdata->slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
*rstn = pdata->rstn;
*slp_tr = pdata->slp_tr;
return 0;
}
spi->dev.platform_data = pdata;
done:
return pdata;
*rstn = of_get_named_gpio(spi->dev.of_node, "reset-gpio", 0);
*slp_tr = of_get_named_gpio(spi->dev.of_node, "sleep-gpio", 0);
return 0;
}
static int
@ -1501,43 +1501,42 @@ at86rf230_setup_spi_messages(struct at86rf230_local *lp)
static int at86rf230_probe(struct spi_device *spi)
{
struct at86rf230_platform_data *pdata;
struct ieee802154_hw *hw;
struct at86rf230_local *lp;
unsigned int status;
int rc, irq_type;
int rc, irq_type, rstn, slp_tr;
if (!spi->irq) {
dev_err(&spi->dev, "no IRQ specified\n");
return -EINVAL;
}
pdata = at86rf230_get_pdata(spi);
if (!pdata) {
dev_err(&spi->dev, "no platform_data\n");
return -EINVAL;
rc = at86rf230_get_pdata(spi, &rstn, &slp_tr);
if (rc < 0) {
dev_err(&spi->dev, "failed to parse platform_data: %d\n", rc);
return rc;
}
if (gpio_is_valid(pdata->rstn)) {
rc = devm_gpio_request_one(&spi->dev, pdata->rstn,
if (gpio_is_valid(rstn)) {
rc = devm_gpio_request_one(&spi->dev, rstn,
GPIOF_OUT_INIT_HIGH, "rstn");
if (rc)
return rc;
}
if (gpio_is_valid(pdata->slp_tr)) {
rc = devm_gpio_request_one(&spi->dev, pdata->slp_tr,
if (gpio_is_valid(slp_tr)) {
rc = devm_gpio_request_one(&spi->dev, slp_tr,
GPIOF_OUT_INIT_LOW, "slp_tr");
if (rc)
return rc;
}
/* Reset */
if (gpio_is_valid(pdata->rstn)) {
if (gpio_is_valid(rstn)) {
udelay(1);
gpio_set_value(pdata->rstn, 0);
gpio_set_value(rstn, 0);
udelay(1);
gpio_set_value(pdata->rstn, 1);
gpio_set_value(rstn, 1);
usleep_range(120, 240);
}