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at86rf230: copy pdata to driver allocated space 

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
View File

@ -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);
}